Warp-SE/cpld/WarpSE.v
Zane Kaminski 8443707339 idk
2023-03-26 04:33:59 -04:00

144 lines
3.2 KiB
Verilog

module WarpSE(
input [23:1] A_FSB,
input nAS_FSB,
input nLDS_FSB,
input nUDS_FSB,
input nWE_FSB,
output nDTACK_FSB,
output nVPA_FSB,
output nBERR_FSB,
input FCLK,
input C16M,
input C8M,
input E,
input nDTACK_IOB,
input nVPA_IOB,
output nVMA_IOB,
output nAS_IOB,
output nUDS_IOB,
output nLDS_IOB,
output nBR_IOB,
input nBG_IOB,
input nBERR_IOB,
inout nRES,
input nIPL2,
output nROMCS,
output nRAMLWE,
output nRAMUWE,
output nROMWE,
output nRAS,
output nCAS,
output [11:0] RA,
output nOE,
output nADoutLE0,
output nADoutLE1,
output nAoutOE,
output nDoutOE,
output nDinOE,
output nDinLE,
input [3:1] SW,
output C20MEN,
output C25MEN);
/* FSB clock oscillator enables */
// Enable both oscillators... only mount one
assign C20MEN = 1;
assign C25MEN = 1;
/* Reset input and open-drain output */
wire nRESin = nRES;
wire nRESout;
assign nRES = !nRESout ? 1'b0 : 1'bZ;
/* AS cycle detection */
wire BACT;
/* Refresh request/ack signals */
wire RefReq, RefUrg;
/* FSB chip select signals */
wire IOCS, IOPWCS, IACS, ROMCS, RAMCS, SndRAMCSWR;
CS cs(
/* MC68HC000 interface */
A_FSB[23:08], FCLK, nRESin, nWE_FSB,
/* AS cycle detection */
BACT,
/* Device select outputs */
IOCS, IOPWCS, IACS, ROMCS, RAMCS, SndRAMCSWR);
wire RAM_Ready;
RAM ram(
/* MC68HC000 interface */
FCLK, A_FSB[21:1], nWE_FSB, nAS_FSB, nLDS_FSB, nUDS_FSB,
/* AS cycle detection */
BACT,
/* Select and ready signals */
RAMCS, ROMCS, RAM_Ready,
/* Refresh Counter Interface */
RefReq, RefUrg,
/* DRAM and NOR flash interface */
RA[11:0], nRAS, nCAS,
nRAMLWE, nRAMUWE, nOE, nROMCS, nROMWE);
wire IOBS_Ready;
wire IOREQ, IOACT, IOBERR;
wire ALE0S, ALE0M, ALE1;
assign nADoutLE0 = ~(ALE0S || ALE0M);
assign nADoutLE1 = ~ALE1;
wire IORW0, IOL0, IOU0;
IOBS iobs(
/* MC68HC000 interface */
FCLK, nWE_FSB, nAS_FSB, nLDS_FSB, nUDS_FSB,
/* AS cycle detection, FSB BERR */
BACT,
/* Select and ready signals */
IOCS, IOPWCS, IOBS_Ready, nBERR_FSB,
/* Read data OE control */
nDinOE,
/* IOB Master Controller Interface */
IOREQ, IOACT, IOBERR,
/* FIFO primary level control */
ALE0S, IORW0, IOL0, IOU0,
/* FIFO secondary level control */
ALE1);
wire AoutOE;
assign nAoutOE = !AoutOE;
wire nAS_IOBout, nLDS_IOBout, nUDS_IOBout, nVMA_IOBout;
assign nAS_IOB = AoutOE ? nAS_IOBout : 1'bZ;
assign nLDS_IOB = AoutOE ? nLDS_IOBout : 1'bZ;
assign nUDS_IOB = AoutOE ? nUDS_IOBout : 1'bZ;
assign nVMA_IOB = AoutOE ? nVMA_IOBout : 1'bZ;
IOBM iobm(
/* PDS interface */
C16M, C8M, E,
nAS_IOBout, nLDS_IOBout, nUDS_IOBout, nVMA_IOBout,
nDTACK_IOB, nVPA_IOB, nBERR_IOB, nRESin,
/* PDS address and data latch control */
AoutOE, nDoutOE, ALE0M, nDinLE,
/* IO bus slave port interface */
IOACT, IOBERR,
IOREQ, IOL0, IOU0, !IORW0);
CNT cnt(
/* FSB clock and E clock inputs */
FCLK, E,
/* Refresh request */
RefReq, RefUrg,
/* Reset, button */
nRESout, nIPL2,
/* Mac PDS bus master control outputs */
AoutOE, nBR_IOB);
FSB fsb(
/* MC68HC000 interface */
FCLK, nAS_FSB, nDTACK_FSB, nVPA_FSB,
/* FSB cycle detection */
BACT,
/* Ready inputs */
RAM_Ready, IOBS_Ready, 1,
/* Interrupt acknowledge select */
IACS);
endmodule