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https://github.com/MiSTer-devel/CreatiVision_MiSTer.git
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488 lines
12 KiB
Systemverilog
488 lines
12 KiB
Systemverilog
//============================================================================
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//
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// This program is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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//============================================================================
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module emu
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(
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//Master input clock
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input CLK_50M,
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//Async reset from top-level module.
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//Can be used as initial reset.
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input RESET,
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//Must be passed to hps_io module
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inout [48:0] HPS_BUS,
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//Base video clock. Usually equals to CLK_SYS.
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output CLK_VIDEO,
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//Multiple resolutions are supported using different CE_PIXEL rates.
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//Must be based on CLK_VIDEO
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output CE_PIXEL,
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//Video aspect ratio for HDMI. Most retro systems have ratio 4:3.
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//if VIDEO_ARX[12] or VIDEO_ARY[12] is set then [11:0] contains scaled size instead of aspect ratio.
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output [12:0] VIDEO_ARX,
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output [12:0] VIDEO_ARY,
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output [7:0] VGA_R,
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output [7:0] VGA_G,
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output [7:0] VGA_B,
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output VGA_HS,
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output VGA_VS,
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output VGA_DE, // = ~(VBlank | HBlank)
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output VGA_F1,
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output [1:0] VGA_SL,
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output VGA_SCALER, // Force VGA scaler
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output VGA_DISABLE, // analog out is off
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input [11:0] HDMI_WIDTH,
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input [11:0] HDMI_HEIGHT,
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output HDMI_FREEZE,
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output HDMI_BLACKOUT,
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output HDMI_BOB_DEINT,
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`ifdef MISTER_FB
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// Use framebuffer in DDRAM
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// FB_FORMAT:
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// [2:0] : 011=8bpp(palette) 100=16bpp 101=24bpp 110=32bpp
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// [3] : 0=16bits 565 1=16bits 1555
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// [4] : 0=RGB 1=BGR (for 16/24/32 modes)
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//
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// FB_STRIDE either 0 (rounded to 256 bytes) or multiple of pixel size (in bytes)
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output FB_EN,
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output [4:0] FB_FORMAT,
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output [11:0] FB_WIDTH,
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output [11:0] FB_HEIGHT,
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output [31:0] FB_BASE,
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output [13:0] FB_STRIDE,
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input FB_VBL,
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input FB_LL,
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output FB_FORCE_BLANK,
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`ifdef MISTER_FB_PALETTE
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// Palette control for 8bit modes.
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// Ignored for other video modes.
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output FB_PAL_CLK,
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output [7:0] FB_PAL_ADDR,
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output [23:0] FB_PAL_DOUT,
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input [23:0] FB_PAL_DIN,
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output FB_PAL_WR,
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`endif
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`endif
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output LED_USER, // 1 - ON, 0 - OFF.
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// b[1]: 0 - LED status is system status OR'd with b[0]
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// 1 - LED status is controled solely by b[0]
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// hint: supply 2'b00 to let the system control the LED.
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output [1:0] LED_POWER,
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output [1:0] LED_DISK,
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// I/O board button press simulation (active high)
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// b[1]: user button
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// b[0]: osd button
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output [1:0] BUTTONS,
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input CLK_AUDIO, // 24.576 MHz
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output [15:0] AUDIO_L,
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output [15:0] AUDIO_R,
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output AUDIO_S, // 1 - signed audio samples, 0 - unsigned
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output [1:0] AUDIO_MIX, // 0 - no mix, 1 - 25%, 2 - 50%, 3 - 100% (mono)
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//ADC
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inout [3:0] ADC_BUS,
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//SD-SPI
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output SD_SCK,
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output SD_MOSI,
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input SD_MISO,
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output SD_CS,
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input SD_CD,
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//High latency DDR3 RAM interface
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//Use for non-critical time purposes
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output DDRAM_CLK,
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input DDRAM_BUSY,
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output [7:0] DDRAM_BURSTCNT,
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output [28:0] DDRAM_ADDR,
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input [63:0] DDRAM_DOUT,
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input DDRAM_DOUT_READY,
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output DDRAM_RD,
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output [63:0] DDRAM_DIN,
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output [7:0] DDRAM_BE,
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output DDRAM_WE,
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//SDRAM interface with lower latency
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output SDRAM_CLK,
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output SDRAM_CKE,
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output [12:0] SDRAM_A,
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output [1:0] SDRAM_BA,
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inout [15:0] SDRAM_DQ,
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output SDRAM_DQML,
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output SDRAM_DQMH,
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output SDRAM_nCS,
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output SDRAM_nCAS,
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output SDRAM_nRAS,
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output SDRAM_nWE,
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`ifdef MISTER_DUAL_SDRAM
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//Secondary SDRAM
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//Set all output SDRAM_* signals to Z ASAP if SDRAM2_EN is 0
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input SDRAM2_EN,
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output SDRAM2_CLK,
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output [12:0] SDRAM2_A,
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output [1:0] SDRAM2_BA,
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inout [15:0] SDRAM2_DQ,
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output SDRAM2_nCS,
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output SDRAM2_nCAS,
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output SDRAM2_nRAS,
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output SDRAM2_nWE,
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`endif
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input UART_CTS,
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output UART_RTS,
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input UART_RXD,
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output UART_TXD,
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output UART_DTR,
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input UART_DSR,
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// Open-drain User port.
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// 0 - D+/RX
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// 1 - D-/TX
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// 2..6 - USR2..USR6
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// Set USER_OUT to 1 to read from USER_IN.
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input [6:0] USER_IN,
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output [6:0] USER_OUT,
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input OSD_STATUS
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);
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///////// Default values for ports not used in this core /////////
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assign ADC_BUS = 'Z;
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assign USER_OUT = '1;
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assign {UART_RTS, UART_TXD, UART_DTR} = 0;
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assign {SD_SCK, SD_MOSI, SD_CS} = 'Z;
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assign {SDRAM_DQ, SDRAM_A, SDRAM_BA, SDRAM_CLK, SDRAM_CKE, SDRAM_DQML, SDRAM_DQMH, SDRAM_nWE, SDRAM_nCAS, SDRAM_nRAS, SDRAM_nCS} = 'Z;
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assign {DDRAM_CLK, DDRAM_BURSTCNT, DDRAM_ADDR, DDRAM_DIN, DDRAM_BE, DDRAM_RD, DDRAM_WE} = '0;
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assign VGA_F1 = 0;
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assign VGA_SCALER = 0;
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assign VGA_DISABLE = 0;
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assign HDMI_FREEZE = 0;
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assign HDMI_BLACKOUT = 0;
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assign HDMI_BOB_DEINT = 0;
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assign AUDIO_S = 1;
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assign AUDIO_L = AUDIO_R;
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assign AUDIO_MIX = 0;
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assign LED_DISK = (cart_download | bootrom_download | text_download) & ~ioctl_wait;
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assign LED_POWER = 0;
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assign LED_USER = kb_matrix ? ~pia_ca2 : ~pa_out[6];
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assign BUTTONS = 0;
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//////////////////////////////////////////////////////////////////
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`include "build_id.v"
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localparam CONF_STR = {
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"CreatiVision;;",
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"-;",
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"F1,rombin,Load Cartridge;",
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"FC2,rombin,Load Bios;",
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"F3,bas,Load BASIC;",
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"-;",
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"O[14:13],System Type,CreatiVision,Laser 2001,Custom;",
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"h1O[16:15],ZeroPage RAM,1k,4k,Mirrored 4k;",
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"h1O[18:17],Extra RAM,None,$4000,Both;",
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"h1O[19],Input Matrix,CreatiVision,Laser 2001;",
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"O[7],Video Region,NTSC,PAL;",
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"-;",
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"P1,Audio & Video;",
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"P1-;",
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"P1O[1],Border,Off,On;",
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"d0P1O[6],Vertical Crop,Disabled,216p(5x);",
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"d0P1O[12:9],Crop Offset,0,2,4,8,10,12,-12,-10,-8,-6,-4,-2;",
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"P1O[122:121],Aspect ratio,Original,Full Screen,[ARC1],[ARC2];",
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"P1O[3:2],Scandoubler Fx,None,HQ2x,CRT 25%,CRT 50%;",
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"P1O[5:4],Scale,Normal,V-Integer,Narrower HV-Integer,Wider HV-Integer;",
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"-;",
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"R8,Remove Cart;",
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"R0,Reset;",
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"J0,B,A,select,start;",
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"jn,B,A,Select,Start;",
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"jp,Y,B,Select,Start;",
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"V,v",`BUILD_DATE
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};
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wire forced_scandoubler;
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wire [15:0] joystick_0, joystick_1;
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wire [1:0] buttons;
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wire [127:0] status;
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wire [10:0] ps2_key;
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wire [24:0] ioctl_addr;
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wire [7:0] ioctl_dout;
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wire [7:0] ioctl_index;
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wire ioctl_wr;
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wire ioctl_download;
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wire ioctl_wait;
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wire [21:0] gamma_bus;
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wire clk_sys;
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wire clk_vid; // Make a different clock to seperate intent in case the video rate needs change
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wire clock_locked;
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hps_io #(.CONF_STR(CONF_STR)) hps_io
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(
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.clk_sys(clk_sys),
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.HPS_BUS(HPS_BUS),
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.gamma_bus(gamma_bus),
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.forced_scandoubler(forced_scandoubler),
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.buttons(buttons),
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.status(status),
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.status_menumask({status[14],en216p}),
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.ps2_key(ps2_key),
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.joystick_0(joystick_0),
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.joystick_1(joystick_1),
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.ioctl_download(ioctl_download),
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.ioctl_wr(ioctl_wr),
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.ioctl_addr(ioctl_addr),
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.ioctl_dout(ioctl_dout),
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.ioctl_wait(ioctl_wait),
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.ioctl_index(ioctl_index)
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);
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/////////////////////// CLOCKS ///////////////////////////////
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pll pll
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(
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.refclk(CLK_50M),
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.rst(0),
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.outclk_0(clk_sys)
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);
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assign clk_vid = clk_sys;
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wire reset = RESET | status[0] | status[8] | buttons[1] | cart_download | bootrom_download;
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//////////////////////////////////////////////////////////////////
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wire [7:0] R,G,B;
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wire HSync;
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wire VSync;
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wire HBlank;
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wire VBlank;
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wire ce_pix;
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wire [7:0] video;
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wire border = status[1];
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wire [7:0] bootrom_dout, cart_dout;
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wire [15:0] cpu_addr_bus;
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wire bootrom_download = ioctl_download && ((ioctl_index[7:6] == 0 &&ioctl_index[5:0] == 0) || ioctl_index[5:0] == 2);
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wire cart_download = ioctl_download && ((ioctl_index[7:6] == 1 &&ioctl_index[5:0] == 0) || ioctl_index[5:0] == 1);
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wire text_download = ioctl_download && ioctl_index[5:0] == 3;
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reg [15:0] cart_mask = 0;
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reg [15:0] bios_mask = 0;
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always @(posedge clk_sys) begin
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if (cart_download && ioctl_wr)
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cart_mask <= ioctl_addr[15:0];
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if (status[8])
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cart_mask <= '0;
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end
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always @(posedge clk_sys)
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if (bootrom_download && ioctl_wr)
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bios_mask <= ioctl_addr[15:0];
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wire [1:0] cart_wr;
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wire [7:0] cart_din;
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logic tape_adc;
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logic tape_adc_act;
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ltc2308_tape #(.CLK_RATE(42954545)) ltc2308_tape
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(
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.clk(clk_sys),
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.reset(reset),
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.ADC_BUS(ADC_BUS),
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.dout(tape_adc),
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.active(tape_adc_act)
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);
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// 16kb system ROM
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spram #(.addr_width(14), .mem_name("ROM")) bootrom
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(
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.clock (clk_sys),
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.address (bootrom_download ? ioctl_addr : (cpu_addr_bus[13:0] & bios_mask[13:0])),
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.data (ioctl_dout),
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.enable (1),
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.wren (bootrom_download & ioctl_wr),
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.q (bootrom_dout),
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.cs (1)
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);
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// 32kb cart ROM
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spram #(.addr_width(15), .mem_name("CART")) cartrom
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(
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.clock (clk_sys),
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.address (cart_download ? ioctl_addr : cpu_addr_bus[14:0]),
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.data (cart_download ? ioctl_dout : cart_din),
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.enable (1),
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.wren (cart_download ? (cart_download & ioctl_wr) : |cart_wr),
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.q (cart_dout),
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.cs (1)
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);
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wire [7:0] pa_out, pb_out;
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wire [7:0] pa_in, pb_in;
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wire pia_ca1, pia_ca2;
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wire [1:0] bank_mode = status[14] && !status[18] ? {1'b0, status[17]} : 2'b11; // Default to RAM unless cart. Why not?
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wire [1:0] page0_mode = status[14] ? status[16:15] : (status[13] ? 2'b10 : 2'b00);
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wire kb_matrix = status[14] ? status[19] : status[13];
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assign pia_ca1 = kb_matrix ? tape_adc : 1'b1;
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creativision creativision
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(
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.clk (clk_sys),
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.rom_size (cart_mask),
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.border (border),
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.pal (status[7]),
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.ca1_in (pia_ca1),
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.ca2_out (pia_ca2),
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.pa_out (pa_out),
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.pb_out (pb_out),
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.pa_in (kb_matrix ? pa_in : {tape_adc, pa_out[6:0]}),
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.pb_in (pb_in),
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.bank_mode (bank_mode),
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.page0_mode (page0_mode),
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.nmi (joystick_0[7] | joystick_1[7]),
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.reset (reset),
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.cart_write (cart_wr),
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.cart_dout (cart_din),
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.rom_do (cart_dout),
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.boot_do (bootrom_dout),
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.rom_addr (cpu_addr_bus),
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.audio (AUDIO_R),
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.red (R),
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.green (G),
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.blue (B),
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.VSync (VSync),
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.HSync (HSync),
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.VBlank (VBlank),
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.HBlank (HBlank),
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.ce_pix (ce_pix)
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);
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assign CLK_VIDEO = clk_vid;
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wire [1:0] ar = status[122:121];
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wire [3:0] vcopt = status[12:9];
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wire [11:0] arx = (!ar) ? (border ? (status[7] ? 12'd2363 : 12'd142) : (status[7] ? 12'd512 : 12'd32)) : (ar - 1'd1);
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wire [11:0] ary = (!ar) ? (border ? (status[7] ? 12'd1868 : 12'd105) : (status[7] ? 12'd279 : 12'd21)) : 12'd0;
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wire [2:0] scale = status[3:2];
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wire [2:0] sl = scale ? scale - 1'd1 : 3'd0;
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wire scandoubler = (scale || forced_scandoubler);
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assign VGA_SL = sl[1:0];
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wire vcrop_en = status[6];
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reg [4:0] voff;
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reg en216p;
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always @(posedge CLK_VIDEO) begin
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en216p <= ((HDMI_WIDTH == 1920) && (HDMI_HEIGHT == 1080) && !forced_scandoubler && !scale);
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voff <= (vcopt < 6) ? {vcopt,1'b0} : ({vcopt,1'b0} - 5'd24);
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end
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wire vga_de;
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video_freak video_freak
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(
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.*,
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.VGA_DE_IN(vga_de),
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.ARX((!ar) ? arx : (ar - 1'd1)),
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.ARY((!ar) ? ary : 12'd0),
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.CROP_SIZE((en216p & vcrop_en) ? 10'd216 : 10'd0),
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.CROP_OFF(voff),
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.SCALE(status[5:4])
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);
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wire freeze_sync;
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video_mixer #(.LINE_LENGTH(372), .HALF_DEPTH(0), .GAMMA(1)) video_mixer
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(
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.*,
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.VGA_DE(vga_de),
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.hq2x(scale==1),
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.HSync(HSync),
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.HBlank(HBlank),
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.VSync(VSync),
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.VBlank(VBlank),
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.R(R),
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.G(G),
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.B(B)
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);
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wire [10:0] text_key;
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// 0x1800 big-endian 2 byte line sizes
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// 0x1400 big-endian 2 byte line sizes
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// FIXME: 0x1C00 to vram could probably be written directly filtering 0x0A newlines
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text_writer text_entry
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(
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.clk (clk_sys),
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.reset (reset),
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.ascii_byte (ioctl_dout),
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.strobe (ioctl_wr),
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.input_wait (ioctl_wait),
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.ps2_key (text_key)
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);
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cv_keyboard keyboard_from_hell
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(
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.clk (clk_sys),
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.reset (reset),
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.ps2_key (text_download ? text_key[8:0] : ps2_key[8:0]),
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.ps2_keydown (text_download ? text_key[9] : ps2_key[9]),
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.ps2_strobe (text_download ? text_key[10] : ps2_key[10]),
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.joy1 (joystick_0),
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.joy2 (joystick_1),
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.select_a (pa_out),
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.select_b (pb_out),
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.code_b (pb_in),
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.code_a (pa_in)
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);
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endmodule
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