godzil/sd2snes
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

FPGA: region override (patch register $213f)

Browse Source
This commit is contained in:
ikari 2012-01-14 01:21:21 +01:00
parent 5f87768a14
commit 5a3e935a3e
4 changed files with 102 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
verilog/sd2snes/address.v
View File

@ -19,9 +19,10 @@
//////////////////////////////////////////////////////////////////////////////////
module address(
input CLK,
input [3:0] featurebits, // peripheral enable/disable
input [7:0] featurebits, // peripheral enable/disable
input [2:0] MAPPER, // MCU detected mapper
input [23:0] SNES_ADDR, // requested address from SNES
input [7:0] SNES_PA, // peripheral address from SNES
output [23:0] ROM_ADDR, // Address to request from SRAM0
output ROM_SEL, // enable SRAM0 (active low)
output IS_SAVERAM, // address/CS mapped as SRAM?
@ -35,14 +36,16 @@ module address(
input [14:0] bsx_regs,
output dspx_enable,
output dspx_dp_enable,
output dspx_a0
output dspx_a0,
output r213f_enable
);
parameter [2:0]
FEAT_DSPX = 0,
FEAT_ST0010 = 1,
FEAT_SRTC = 2,
FEAT_MSU1 = 3
FEAT_MSU1 = 3,
FEAT_213F = 4
;
wire [23:0] SRAM_SNES_ADDR;
@ -223,10 +226,6 @@ assign dspx_a0 = featurebits[FEAT_DSPX]
?SNES_ADDR[0]
:1'b1;
//reg [7:0] dspx_dp_enable_r;
//initial dspx_dp_enable_r = 8'b00000000;
//always @(posedge CLK) dspx_dp_enable_r <= {dspx_dp_enable_r[6:0], dspx_dp_enable_w};
//assign dspx_dp_enable = &dspx_dp_enable_r[5:2];
assign dspx_dp_enable = dspx_dp_enable_w;
reg [5:0] dspx_enable_r;
@ -234,5 +233,10 @@ initial dspx_enable_r = 6'b000000;
always @(posedge CLK) dspx_enable_r <= {dspx_enable_r[4:0], dspx_enable_w};
assign dspx_enable = &dspx_enable_r[5:2];
wire r213f_enable_w = (SNES_PA == 8'h3f);
reg [5:0] r213f_enable_r;
initial r213f_enable_r = 6'b000000;
always @(posedge CLK) r213f_enable_r <= {r213f_enable_r[4:0], r213f_enable_w};
assign r213f_enable = &r213f_enable_r[5:2] & featurebits[FEAT_213F];
endmodule

22
verilog/sd2snes/main.ucf
View File

@ -460,6 +460,28 @@ NET "SNES_READ" LOC = P115;
NET "SNES_REFRESH" LOC = P155;
NET "SNES_WRITE" LOC = P94;
NET "SNES_PA[0]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[0]" LOC = P90;
NET "SNES_PA[1]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[1]" LOC = P93;
NET "SNES_PA[2]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[2]" LOC = P86;
NET "SNES_PA[3]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[3]" LOC = P87;
NET "SNES_PA[4]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[4]" LOC = P81;
NET "SNES_PA[5]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[5]" LOC = P85;
NET "SNES_PA[6]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[6]" LOC = P152;
NET "SNES_PA[7]" IOSTANDARD = LVCMOS33;
NET "SNES_PA[7]" LOC = P154;
NET "SNES_PARD" IOSTANDARD = LVCMOS33;
NET "SNES_PARD" LOC = P149;
NET "SNES_PAWR" IOSTANDARD = LVCMOS33;
NET "SNES_PAWR" LOC = P150;
NET "SPI_MISO" LOC = P72;

77
verilog/sd2snes/main.v
View File

@ -35,6 +35,10 @@ module main(
output SNES_DATABUS_DIR,
input SNES_SYSCLK,
input [7:0] SNES_PA,
input SNES_PARD,
input SNES_PAWR,
/* SRAM signals */
/* Bus 1: PSRAM, 128Mbit, 16bit, 70ns */
inout [15:0] ROM_DATA,
@ -124,7 +128,7 @@ wire [15:0] dspx_dat_data;
wire [10:0] dspx_dat_addr;
wire dspx_dat_we;
wire [3:0] featurebits;
wire [7:0] featurebits;
wire [23:0] MAPPED_SNES_ADDR;
wire ROM_ADDR0;
@ -321,7 +325,8 @@ mcu_cmd snes_mcu_cmd(
.featurebits_out(featurebits),
.mcu_rrq(MCU_RRQ),
.mcu_wrq(MCU_WRQ),
.mcu_rq_rdy(MCU_RDY)
.mcu_rq_rdy(MCU_RDY),
.region_out(mcu_region)
);
wire [7:0] DCM_STATUS;
@ -334,17 +339,29 @@ my_dcm snes_dcm(
.STATUS(DCM_STATUS)
);
my_dcm snes_dcm2(
.CLKIN(SNES_SYSCLK),
.CLKFX(SYSCLK2),
.RST(DCM_RST)
);
assign DCM_RST=0;
reg [5:0] SNES_PARDr;
reg [5:0] SNES_READr;
reg [5:0] SNES_WRITEr;
reg [5:0] SNES_CPU_CLKr;
wire SNES_PARD_start = (SNES_PARDr == 6'b111110);
wire SNES_RD_start = (SNES_READr == 6'b111110);
wire SNES_WR_start = (SNES_WRITEr == 6'b111110);
wire SNES_cycle_start = (SNES_CPU_CLKr[5:0] == 6'b000001);
wire SNES_cycle_end = (SNES_CPU_CLKr[5:0] == 6'b111110);
always @(posedge SYSCLK2) begin
SNES_PARDr <= {SNES_PARDr[4:0], SNES_PARD};
end
always @(posedge CLK2) begin
SNES_READr <= {SNES_READr[4:0], SNES_READ};
SNES_WRITEr <= {SNES_WRITEr[4:0], SNES_WRITE};
@ -356,6 +373,7 @@ address snes_addr(
.MAPPER(MAPPER),
.featurebits(featurebits),
.SNES_ADDR(SNES_ADDR), // requested address from SNES
.SNES_PA(SNES_PA),
.ROM_ADDR(MAPPED_SNES_ADDR), // Address to request from SRAM (active low)
.ROM_SEL(ROM_SEL), // which SRAM unit to access
.IS_SAVERAM(IS_SAVERAM),
@ -373,7 +391,8 @@ address snes_addr(
//uPD77C25
.dspx_enable(dspx_enable),
.dspx_dp_enable(dspx_dp_enable),
.dspx_a0(DSPX_A0)
.dspx_a0(DSPX_A0),
.r213f_enable(r213f_enable)
);
parameter MODE_SNES = 1'b0;
@ -414,11 +433,23 @@ assign BSX_SNES_DATA_IN = SNES_DATA;
reg [7:0] SNES_DINr;
reg [7:0] ROM_DOUTr;
assign SNES_DATA = (!SNES_READ) ? (srtc_enable ? SRTC_SNES_DATA_OUT
reg [7:0] r213fr;
reg r213f_forceread;
reg [2:0] r213f_delay;
reg [1:0] r213f_state;
initial r213fr = 8'h55;
initial r213f_forceread = 0;
initial r213f_state = 2'b01;
initial r213f_delay = 3'b011;
assign SNES_DATA = (r213f_enable & (!SNES_PARD ^ r213f_forceread)) ? r213fr
:(!SNES_READ ^ r213f_forceread)
? (srtc_enable ? SRTC_SNES_DATA_OUT
:dspx_enable ? DSPX_SNES_DATA_OUT
:dspx_dp_enable ? DSPX_SNES_DATA_OUT
:msu_enable ? MSU_SNES_DATA_OUT
:bsx_data_ovr ? BSX_SNES_DATA_OUT
:dspx_dp_enable ? DSPX_SNES_DATA_OUT
:msu_enable ? MSU_SNES_DATA_OUT
:bsx_data_ovr ? BSX_SNES_DATA_OUT
:SNES_DINr /*(ROM_ADDR0 ? ROM_DATA[7:0] : ROM_DATA[15:8])*/) : 8'bZ;
reg [3:0] ST_MEM_DELAYr;
@ -446,14 +477,14 @@ assign MCU_RDY = RQ_MCU_RDYr;
always @(posedge CLK2) begin
if(MCU_RRQ) begin
MCU_RD_PENDr <= 1'b1;
RQ_MCU_RDYr <= 1'b0;
RQ_MCU_RDYr <= 1'b0;
end else if(MCU_WRQ) begin
MCU_WR_PENDr <= 1'b1;
RQ_MCU_RDYr <= 1'b0;
RQ_MCU_RDYr <= 1'b0;
end else if(STATE & (ST_MCU_RD_END | ST_MCU_WR_END)) begin
MCU_RD_PENDr <= 1'b0;
MCU_WR_PENDr <= 1'b0;
RQ_MCU_RDYr <= 1'b1;
MCU_WR_PENDr <= 1'b0;
RQ_MCU_RDYr <= 1'b1;
end
end
@ -470,7 +501,7 @@ always @(posedge CLK2) begin
ROM_ADDRr <= MAPPED_SNES_ADDR;
if(MCU_RD_PENDr) STATE <= ST_MCU_RD_ADDR;
else if(MCU_WR_PENDr) STATE <= ST_MCU_WR_ADDR;
else STATE <= ST_IDLE;
else STATE <= ST_IDLE;
end
ST_SNES_RD_ADDR: begin
STATE <= ST_SNES_RD_WAIT;
@ -564,7 +595,22 @@ always @(posedge CLK2) begin
STATE <= ST_IDLE;
end
endcase
endcase
end
end
always @(posedge SYSCLK2) begin
if(SNES_PARD_start & r213f_enable) begin
r213f_forceread <= 1'b1;
r213f_delay <= 3'b001;
r213f_state <= 2'b10;
end else if(r213f_state == 2'b10) begin
r213f_delay <= r213f_delay - 1;
if(r213f_delay == 3'b000) begin
r213f_forceread <= 1'b0;
r213f_state <= 2'b01;
r213fr <= {SNES_DATA[7:5], mcu_region, SNES_DATA[3:0]};
end
end
end
@ -595,12 +641,15 @@ assign SNES_DATABUS_OE = (dspx_enable | dspx_dp_enable) ? 1'b0 :
msu_enable ? 1'b0 :
bsx_data_ovr ? (SNES_READ & SNES_WRITE) :
srtc_enable ? (SNES_READ & SNES_WRITE) :
r213f_enable & !SNES_PARD ? 1'b0 :
((IS_ROM & SNES_CS)
|(!IS_ROM & !IS_SAVERAM & !IS_WRITABLE & !IS_FLASHWR)
|(SNES_READ & SNES_WRITE)
);
assign SNES_DATABUS_DIR = !SNES_READ ? 1'b1 : 1'b0;
assign SNES_DATABUS_DIR = (!SNES_READ | (!SNES_PARD & r213f_enable))
? 1'b1 ^ r213f_forceread
: 1'b0;
assign IRQ_DIR = 1'b0;
assign SNES_IRQ = 1'bZ;

8
verilog/sd2snes/mcu_cmd.v
View File

@ -91,8 +91,9 @@ module mcu_cmd(
output reg dspx_reset_out,
// feature enable
output reg [3:0] featurebits_out,
output reg [7:0] featurebits_out,
output reg region_out,
// SNES sync/clk
input snes_sysclk
);
@ -101,6 +102,7 @@ initial begin
dspx_pgm_addr_out = 11'b00000000000;
dspx_dat_addr_out = 10'b0000000000;
dspx_reset_out = 1'b1;
region_out = 0;
end
wire [31:0] snes_sysclk_freq;
@ -342,7 +344,9 @@ always @(posedge clk) begin
8'hec: // release DSPx reset
dspx_reset_out <= 1'b0;
8'hed:
featurebits_out <= param_data[3:0];
featurebits_out <= param_data;
8'hee:
region_out <= param_data[0];
endcase
end
end