Back to "old robust"

This commit is contained in:
Zane Kaminski 2024-10-03 05:51:10 -04:00
parent 31fecec90e
commit 10ebdd43ba
6 changed files with 117 additions and 164 deletions

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@ -1,6 +1,6 @@
module CNT(
/* FSB clock and E clock inputs */
input CLK, input C8M, input E,
input CLK, input E,
/* Refresh request */
output reg RefReq, output reg RefUrg,
/* Reset, button */
@ -9,21 +9,13 @@ module CNT(
output reg AoutOE, output reg nBR_IOB,
/* QoS control */
input BACT,
input BACTr,
input IOQoSCS,
input SndQoSCS,
input IACKCS,
output reg IOQoSEN,
output reg MCKE);
input QoSCS,
output reg QoSEN);
/* E clock synchronization */
reg [1:0] Er; always @(posedge CLK) Er[1:0] <= { Er[0], E };
wire EFall = Er[1] && !Er[0];
/* C8M clock synchronization */
reg [1:0] C8Mr; always @(posedge CLK) C8Mr[1:0] <= { C8Mr[0], C8M };
wire C8MFall = C8Mr[1] && !C8Mr[0];
/* NMI and reset synchronization */
reg nIPL2r; always @(posedge CLK) nIPL2r <= nIPL2;
reg nRESr; always @(posedge CLK) nRESr <= nRESin;
@ -60,38 +52,35 @@ module CNT(
end
end
/* During init (IS!=3) long timer counts from 0 to 3072.
* 3073 states == 43.151 ms */
/* During init (IS!=3) long timer counts from 0 to 4095.
* 4096 states == 57.516 ms */
reg [11:0] LTimer;
wire LTimerTC = LTimer[11:10]==2'b11;
reg LTimerTC;
always @(posedge CLK) begin
if (EFall && TimerTC) LTimer <= LTimer+1;
if (EFall && TimerTC) begin
LTimer <= LTimer+1;
LTimerTC <= LTimer[11:0]==12'hFFE;
end
end
/* QoS select registers */
reg IOQoSCSr;
always @(posedge CLK) IOQoSCSr <= (BACT && (IOQoSCS || SndQoSCS || IACKCS)) || !nRESr;
/* QoS select latch */
reg QoSCSr;
always @(posedge CLK) if (BACT) QoSCSr <= QoSCS;
/* I/O QoS timer */
reg [3:0] IOQS;
/* QoS timer
* In the absence of a QoS trigger, QS==0.
* When Qos triggered, QS is set to 1 and counts 1, 2, 3, 0.
* While QS!=0, QoS is enabled.
* QoS enable period is 28.124 us - 42.240 us */
reg [1:0] QS;
always @(posedge CLK) begin
if (IOQoSCSr) IOQS <= 4'hF;
else if (IOQS==0) IOQS <= 0;
else if (EFall && TimerTC) IOQS <= IOQS-1;
if (!nRESr || QoSCSr) QS[1:0] <= 1;
else if (QS==0) QS[1:0] <= 0;
else if (EFall && TimerTC) QS[1:0] <= QS+1;
end
/* I/O QoS enable */
always @(posedge CLK) if (!BACT) IOQoSEN <= IOQS!=0;
/* MC68K clock enable */
always @(posedge CLK) MCKE <= 1;//BACT || BACTr || !IOQoSEN || C8MFall;
/* */
reg LookReset;
always @(posedge CLK) begin
if (!nRESout) LookReset <= 0;
else if (EFall) LookReset <= 1;
end
/* QoS enable control */
always @(posedge CLK) if (!BACT) QoSEN <= QoSCSr || QS!=0;
/* Startup sequence state control */
wire ISTC = EFall && TimerTC && LTimerTC;
@ -113,8 +102,9 @@ module CNT(
if (ISTC) IS <= 3;
end 3: begin
nRESout <= 1; // Release reset
if (LookReset && !nRESr) IS <= 0;
IS <= 3;
end
endcase
end
endmodule

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@ -4,12 +4,11 @@ module CS(
/* AS cycle detection */
input BACT,
/* QoS enable input */
input IOQoSEN,
input QoSEN,
/* Device select outputs */
output IOCS, output IORealCS, output IOPWCS, output IACKCS,
output IOCS, output IORealCS, output IOPWCS, output IACS,
output ROMCS, output ROMCS4X,
output RAMCS, output RAMCS0X,
output IOQoSCS, output SndQoSCS);
output RAMCS, output RAMCS0X, output QoSCS);
/* Overlay control */
reg Overlay;
@ -19,7 +18,7 @@ module CS(
end
/* I/O select signals */
assign IACKCS = A[23:20]==4'hF;
wire IACKCS = A[23:20]==4'hF;
wire VIACS = A[23:20]==4'hE;
wire IWMCS = A[23:20]==4'hD;
wire SCCCS = A[23:20]==4'hB || A[23:20]==4'h9;
@ -46,13 +45,13 @@ module CS(
//A[15:12]==4'hD || // 4096 bytes video
//A[15:12]==4'hE || // 4096 bytes video
//A[15:12]==4'hF); // 3200 bytes video, 128 bytes RAM (system error space), 768 bytes sound
assign SndQoSCS = VidRAMCSWR64k && (
wire SndRAMCSWR = VidRAMCSWR64k && (
((A[15:12]==4'hF) && (A[11:8]==4'hD || A[11:8]==4'hE || A[11:8]==4'hF)) ||
((A[15:12]==4'hA) && (A[11:8]==4'h1 || A[11:8]==4'h2 || A[11:8]==4'h3)));
assign IOQoSCS = IWMCS || VIACS || SCCCS || SCSICS;
assign QoSCS = IACKCS || VIACS || IWMCS || SCCCS || SCSICS || SndRAMCSWR;
/* Select signals - IOB domain */
assign IACKCS = A[23:20]==4'hF; // IACK
assign IACS = A[23:20]==4'hF; // IACK
assign IORealCS =
A[23:20]==4'hF || // IACK
A[23:20]==4'hE || // VIA
@ -65,6 +64,6 @@ module CS(
A[23:20]==4'h7 || // empty (expansion RAM)
A[23:20]==4'h6 || // empty (expansion RAM)
A[23:20]==4'h5; // SCSI
assign IOCS = IORealCS || VidRAMCSWR || IOQoSEN;
assign IOPWCS = VidRAMCSWR64k && !IOQoSEN; // Posted write to video RAM only when QoS disabled
assign IOCS = IORealCS || VidRAMCSWR || QoSEN;
assign IOPWCS = VidRAMCSWR64k && !QoSEN; // Posted write to video RAM only when QoS disabled
endmodule

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@ -1,37 +1,31 @@
module FSB(
/* MC68HC000 interface */
input FCLK, input nAS, output reg nDTACK, output reg nVPA,
/* MC68HC000 clock enable */
input MCKEi, output reg MCKE,
/* AS cycle detection */
output BACT, output reg BACTr,
/* Ready inputs */
input ROMCS,
input RAMCS, input RAMReady,
input IOPWCS, input IOPWReady, input IONPReady,
input IOQoSEN,
input QoSEN,
/* Interrupt acknowledge select */
input IACKCS);
/* MC68k clock enable */
always @(negedge FCLK) MCKE <= MCKEi;
input IACS);
/* AS cycle detection */
reg ASrf = 0;
always @(negedge FCLK) begin ASrf <= !nAS; end
assign BACTu = !nAS || ASrf;
assign BACT = BACTu && MCKE;
assign BACT = !nAS || ASrf; // BACT - bus active
always @(posedge FCLK) BACTr <= BACT;
/* DTACK/VPA control */
wire Ready = (RAMCS && !IOQoSEN && RAMReady && !IOPWCS) ||
(RAMCS && !IOQoSEN && RAMReady && IOPWCS && IOPWReady) ||
(ROMCS && !IOQoSEN) ||
wire Ready = (RAMCS && !QoSEN && RAMReady && !IOPWCS) ||
(RAMCS && !QoSEN && RAMReady && IOPWCS && IOPWReady) ||
(ROMCS && !QoSEN) ||
(IONPReady);
always @(posedge FCLK) nDTACK <= !(Ready && BACT && !IACKCS);
always @(posedge FCLK) nDTACK <= !(Ready && BACT && !IACS);
always @(posedge FCLK, posedge nAS) begin
if (nAS) nVPA <= 1;
else nVPA <= !(Ready && BACT && IACKCS);
else nVPA <= !(Ready && BACT && IACS);
end
endmodule

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@ -1,19 +1,21 @@
module IOBM(
/* PDS interface */
input C16M, input C8M, input E,
output reg nAS, output reg nLDS, output reg nUDS, output reg RnW, output reg nVMA,
output reg nASout, output reg nLDS, output reg nUDS, output reg nVMA,
input nDTACK, input nVPA, input nBERR, input nRES,
/* PDS address and data latch control */
input AoutOE, output nDoutOE, output reg ALE0, output reg nDinLE,
/* IO bus slave port interface */
input IOREQ, input IORW, input IOLDS, input IOUDS,
input IORDREQ, input IOWRREQ, input IOLDS, input IOUDS,
output reg IOACT, output reg IODONE, output reg IOBERR);
/* C8M clock registration */
reg C8Mr; always @(posedge C16M) C8Mr <= C8M;
/* I/O request input synchronization */
reg IOREQr; always @(posedge C16M) IOREQr <= IOREQ;
reg IORDREQr; always @(posedge C16M) IORDREQr <= IORDREQ;
reg IOWRREQr; always @(posedge C16M) IOWRREQr <= IOWRREQ;
wire IOREQr = IORDREQr || IOWRREQr;
/* VPA synchronization */
reg VPAr; always @(negedge C8M) VPAr <= !nVPA;
@ -37,8 +39,8 @@ module IOBM(
end
/* DTACK and BERR synchronization */
always @(negedge C8M, posedge nAS) begin
if (nAS) begin
always @(negedge C8M, posedge nASout) begin
if (nASout) begin
IODONE <= 0;
IOBERR <= 0;
end else begin
@ -50,8 +52,8 @@ module IOBM(
/* I/O bus state */
reg [2:0] IOS = 0;
reg IOS0;
always @(posedge C16M) case (IOS[2:0])
3'h0: begin
always @(posedge C16M) begin
if (IOS==0) begin
if (IOREQr && !C8Mr && AoutOE) begin // "IOS1"
IOS <= 2;
IOS0 <= 0;
@ -59,24 +61,24 @@ module IOBM(
IOS <= 0;
IOS0 <= 1;
end
IOACT <= IOREQr;
ALE0 <= IOREQr;
end 3'h2: begin
IOACT <= IOREQr && AoutOE;
ALE0 <= IOREQr && AoutOE;
end else if (IOS==2) begin
IOS <= 3;
IOS0 <= 0;
IOACT <= 1;
ALE0 <= 1;
end 3'h3: begin
end else if (IOS==3) begin
IOS <= 4;
IOS0 <= 0;
IOACT <= 1;
ALE0 <= 1;
end 3'h4: begin
end else if (IOS==4) begin
IOS <= 5;
IOS0 <= 0;
IOACT <= 1;
ALE0 <= 1;
end 3'h5: begin
end else if (IOS==5) begin
if (!C8Mr && (IODONE || IOBERR)) begin
IOS <= 6;
IOACT <= 0;
@ -86,55 +88,33 @@ module IOBM(
end
IOS0 <= 0;
ALE0 <= 1;
end 3'h6: begin
end else if (IOS==6) begin
IOS <= 7;
IOS0 <= 0;
IOACT <= 0;
ALE0 <= 0;
end 3'h7: begin
end else if (IOS==7) begin
IOS <= 0;
IOS0 <= 1;
IOACT <= 0;
ALE0 <= 0;
end
endcase
end
/* PDS address and data latch control */
always @(negedge C16M) begin nDinLE = IOS==4 || IOS==5; end
reg DoutOE = 0;
always @(posedge C16M) begin
DoutOE <= (IOS==0 && IOREQr && !IORW && !C8Mr) ||
DoutOE <= (IOS==0 && IOWRREQr && !C8Mr) ||
(DoutOE && (IOS==2 || IOS==3 || IOS==4 || IOS==5));
end
assign nDoutOE = !(AoutOE && (DoutOE || (IOS0 && !IOREQr)));
/* AS, DS, RW control */
/* AS, DS control */
always @(negedge C16M) begin
nAS <= !(
(IOS==0 && IOREQr && !C8Mr) ||
(IOS==2) ||
(IOS==3) ||
(IOS==4) ||
(IOS==5));
RnW <= !(
(IOS==0 && IOREQr && !IORW && !C8Mr) ||
(!IORW && IOS==2) ||
(!IORW && IOS==3) ||
(!IORW && IOS==4) ||
(!IORW && IOS==5) ||
(!IORW && IOS==6));
nLDS <= !(
(IOS==0 && IOREQr && IORW && IOLDS && !C8Mr) ||
(IOS==2 && IOLDS) ||
(IOS==3 && IOLDS) ||
(IOS==4 && IOLDS) ||
(IOS==5 && IOLDS));
nUDS <= !(
(IOS==0 && IOREQr && IORW && IOUDS && !C8Mr) ||
(IOS==2 && IOUDS) ||
(IOS==3 && IOUDS) ||
(IOS==4 && IOUDS) ||
(IOS==5 && IOUDS));
nASout <= !((IOS==0 && IOREQr && !C8Mr) || IOS==2 || IOS==3 || IOS==4 || IOS==5);
nLDS <= !(IOLDS && ((IOS==0 && IORDREQr && !C8Mr) || (IOS==2 && !nLDS) || IOS==3 || IOS==4 || IOS==5));
nUDS <= !(IOUDS && ((IOS==0 && IORDREQr && !C8Mr) || (IOS==2 && !nUDS) || IOS==3 || IOS==4 || IOS==5));
end
endmodule

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@ -10,7 +10,7 @@ module IOBS(
/* Read data OE control */
output nDinOE,
/* IOB master controller interface */
output reg IOREQ, output reg IORW,
output reg IORDREQ, output reg IOWRREQ,
input IOACT, input IODONEin, input IOBERR,
/* FIFO primary level control */
output reg ALE0, output reg IOL0, output reg IOU0,
@ -56,7 +56,7 @@ module IOBS(
always @(posedge CLK) begin // ALE clear control
// Make address latch transparent in cycle after TS3
// (i.e. first TS2 cycle that's not part of current write)
if (TS==1) Clear1 <= 1;
if (TS==3) Clear1 <= 1;
else Clear1 <= 0;
end
always @(posedge CLK) begin // LDS, UDS, ALE control
@ -70,32 +70,30 @@ module IOBS(
/* FIFO primary level control */
always @(posedge CLK) begin
if (TS==0) begin
// Start IOREQ if FIFO secondary level occupied or FSB request
if (ALE1 || (BACT && IOCS && !ALE1 && !Sent)) begin
// Request transfer from IOBM
TS <= 1;
IOREQ <= 1;
end else begin // Otherwise stay in idle
TS <= 0;
IOREQ <= 0;
end
// Latch R/W and data strobes from FIFO secondary or FSB
if (ALE1) begin
IORW <= IORW1;
if (ALE1) begin // If FIFO secondary level occupied
// Request transfer from IOBM and latch R/W from FIFO
TS <= 3;
IORDREQ <= IORW1;
IOWRREQ <= !IORW1;
IOL0 <= IOL1;
IOU0 <= IOU1;
end else begin
IORW <= nWE;
end else if (BACT && IOCS && !ALE1 && !Sent) begin // FSB request
// Request transfer from IOBM and latch R/W from FSB
TS <= 3;
IORDREQ <= nWE;
IOWRREQ <= !nWE;
IOL0 <= !nLDS;
IOU0 <= !nUDS;
end else begin // Otherwise stay in idle
TS <= 0;
IORDREQ <= 0;
IOWRREQ <= 0;
end
ALE0 <= 0;
end else if (TS==1) begin
TS <= 2; // Always go to TS2
IOREQ <= 1; // Keep IOREQ active
end else if (TS==3) begin
TS <= 2; // Always go to TS2. Keep IORDREQ/IOWRREQ active
ALE0 <= 1; // Latch address (and data)
// Latch data strobes again from FIFO or FSB as appropriate
// Latch data strobes from FIFO or FSB as appropriate
if (ALE1) begin
IOL0 <= IOL1;
IOU0 <= IOU1;
@ -104,20 +102,19 @@ module IOBS(
IOU0 <= !nUDS;
end
end else if (TS==2) begin
// Wait for IOACT (transfer started) then withdraw IOREQ and enter TS1
// Wait for IOACT then withdraw IOREQ and enter TS1
if (IOACTr) begin
TS <= 3;
IOREQ <= 0;
end else begin
TS <= 2;
IOREQ <= 1;
end
TS <= 1;
IORDREQ <= 0;
IOWRREQ <= 0;
end else TS <= 2;
ALE0 <= 1; // Keep address latched
end else if (TS==3) begin
end else if (TS==1) begin
// Wait for IOACT low (transfer over) before going back to idle
if (!IOACTr) TS <= 0;
else TS <= 3;
IOREQ <= 0;
else TS <= 1;
IORDREQ <= 0;
IOWRREQ <= 0;
ALE0 <= 0; // Release addr latch since it's controlled by IOBM now
end
end

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@ -18,7 +18,6 @@ module WarpSE(
output nAS_IOB,
output nUDS_IOB,
output nLDS_IOB,
output RnW_IOB,
output nBR_IOB,
input nBG_IOB,
input nBERR_IOB,
@ -41,15 +40,18 @@ module WarpSE(
output MCKE,
input [5:0] DBG);
/* MC68k clock enable */
assign MCKE = 1;
/* GA gated (translated) address output */
assign GA[23:22] = A_FSB[23:22];
/*assign GA[23:22] = (
//assign GA[23:22] = A_FSB[23:22];
assign GA[23:22] = (
// $800000-$8FFFFF to $000000-$0FFFFF (1 MB)
(A_FSB[23:20]==4'h8) ||
// $700000-$7EFFFF to $300000-$3EFFFF (960 kB)
(A_FSB[23:20]==4'h7 && A_FSB[19:16]!=4'hF) ||
// $600000-$6FFFFF to $200000-$2FFFFF (1 MB)
(A_FSB[23:20]==4'h6)) ? 2'b00 : A_FSB[23:22];*/
(A_FSB[23:20]==4'h6)) ? 2'b00 : A_FSB[23:22];
/* Reset input and open-drain output */
wire nRESin = nRES;
@ -57,34 +59,30 @@ module WarpSE(
assign nRES = !nRESout ? 1'b0 : 1'bZ;
/* AS cycle detection */
wire BACT, BACTr;
/* MC68k clock enable */
wire MCKEi;
wire BACT;
wire BACTr;
/* Refresh request/ack signals */
wire RefReq, RefUrg;
/* QoS enable */
wire IOQoSEN;
wire QoSEN;
/* FSB chip select signals */
wire IOCS, IORealCS, IOPWCS, IACKCS;
wire IOCS, IORealCS, IOPWCS, IACS;
wire ROMCS, ROMCS4X;
wire RAMCS, RAMCS0X;
wire IOQoSCS, SndQoSCS;
wire RAMCS, RAMCS0X, QoSCS;
CS cs(
/* MC68HC000 interface */
A_FSB[23:08], FCLK, nRESin, nWE_FSB,
/* /AS cycle detection */
BACT,
/* QoS enable input */
IOQoSEN,
QoSEN,
/* Device select outputs */
IOCS, IORealCS, IOPWCS, IACKCS,
IOCS, IORealCS, IOPWCS, IACS,
ROMCS, ROMCS4X,
RAMCS, RAMCS0X,
IOQoSCS, SndQoSCS);
RAMCS, RAMCS0X, QoSCS);
wire RAMReady;
RAM ram(
@ -104,7 +102,7 @@ module WarpSE(
nRAMLWE, nRAMUWE, nOE, nROMOE, nROMWE);
wire IONPReady, IOPWReady;
wire IOREQ, IORW;
wire IORDREQ, IOWRREQ;
wire IOL0, IOU0;
wire ALE0S, ALE0M, ALE1;
assign nADoutLE0 = ~(ALE0S || ALE0M);
@ -122,7 +120,7 @@ module WarpSE(
/* Read data OE control */
nDinOE,
/* IOB Master Controller Interface */
IOREQ, IORW,
IORDREQ, IOWRREQ,
IOACT, IODONE, IOBERR,
/* FIFO primary level control */
ALE0S, IOL0, IOU0,
@ -131,26 +129,25 @@ module WarpSE(
wire AoutOE;
assign nAoutOE = !AoutOE;
wire nAS_IOBout, nLDS_IOBout, nUDS_IOBout, RnW_IOBout, nVMA_IOBout;
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 RnW_IOB = AoutOE ? RnW_IOBout : 1'bZ;
assign nVMA_IOB = AoutOE ? nVMA_IOBout : 1'bZ;
IOBM iobm(
/* PDS interface */
C16M, C8M, E,
nAS_IOBout, nLDS_IOBout, nUDS_IOBout, RnW_IOBout, nVMA_IOBout,
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 */
IOREQ, IORW, IOL0, IOU0,
IORDREQ, IOWRREQ, IOL0, IOU0,
IOACT, IODONE, IOBERR);
CNT cnt(
/* FSB clock and E clock inputs */
FCLK, C8M, E,
FCLK, E,
/* Refresh request */
RefReq, RefUrg,
/* Reset, button */
@ -158,23 +155,19 @@ module WarpSE(
/* Mac PDS bus master control outputs */
AoutOE, nBR_IOB,
/* QoS control */
BACT, BACTr,
IOQoSCS, SndQoSCS, IACKCS,
IOQoSEN, MCKEi);
BACT, QoSCS, QoSEN);
FSB fsb(
/* MC68HC000 interface */
FCLK, nAS_FSB, nDTACK_FSB, nVPA_FSB,
/* MC68HC000 clock enable */
MCKEi, MCKE,
/* FSB cycle detection */
BACT, BACTr,
/* Ready inputs */
ROMCS4X,
RAMCS0X, RAMReady,
IOPWCS, IOPWReady, IONPReady,
IOQoSEN,
QoSEN,
/* Interrupt acknowledge select */
IACKCS);
IACS);
endmodule