Add a first cut at strataflash support

[fpgaboy.git] / System.v

diff --git a/System.v b/System.v
index c2e892bd1a4029a85cf603b84a6b4fbcee8df331..e0baebe3c65f9dad345554cc8137b35010ed4282 100644 (file)
--- a/System.v
+++ b/System.v
@@ -81,6 +81,7 @@ module CellularRAM(
        inout [7:0] data,
        input wr, rd,
        output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK,
+       output wire st_nCE, st_nRST,
        output wire [22:0] cr_A,
        inout [15:0] cr_DQ);
        
@@ -88,6 +89,7 @@ module CellularRAM(
        parameter ADDR_PROGADDRM = 16'hFF61;
        parameter ADDR_PROGADDRL = 16'hFF62;
        parameter ADDR_PROGDATA = 16'hFF63;
+       parameter ADDR_PROGFLASH = 16'hFF65;
        parameter ADDR_MBC = 16'hFF64;
        
        reg rdlatch = 0, wrlatch = 0;
@@ -102,25 +104,28 @@ module CellularRAM(
                                                // low 7 bits are the MBC that we are emulating
        
        assign cr_nADV = 0;     /* Addresses are always valid! :D */
-       assign cr_nCE = 0;      /* The chip is enabled */
+       assign cr_nCE = ~(addrlatch != ADDR_PROGFLASH); /* The chip is enabled */
        assign cr_nLB = 0;      /* Lower byte is enabled */
        assign cr_nUB = 0;      /* Upper byte is enabled */
        assign cr_CRE = 0;      /* Data writes, not config */
        assign cr_CLK = 0;      /* Clock? I think not! */
        
-       wire decode = (addrlatch[15:14] == 2'b00) /* extrom */ || (addrlatch[15:13] == 3'b101) /* extram */ || (addrlatch == ADDR_PROGDATA);
+       assign st_nRST = 1;     /* Keep the strataflash out of reset. */
+       assign st_nCE = ~(addrlatch == ADDR_PROGFLASH);
+       
+       wire decode = (addrlatch[15:14] == 2'b00) /* extrom */ || (addrlatch[15:13] == 3'b101) /* extram */ || (addrlatch == ADDR_PROGDATA) || (addrlatch == ADDR_PROGFLASH);
        
        reg [3:0] rambank = 0;
        reg [8:0] rombank = 1;
        
        assign cr_nOE = decode ? ~rdlatch : 1;
-       assign cr_nWE = (decode && ((addrlatch == ADDR_PROGDATA) || (mbc_emul[6:0] == 0))) ? ~wrlatch : 1;
+       assign cr_nWE = (decode && ((addrlatch == ADDR_PROGDATA) || (addrlatch == ADDR_PROGFLASH) || (mbc_emul[6:0] == 0) || (addrlatch[15:13] == 3'b101))) ? ~wrlatch : 1;
        
        assign cr_DQ = (~cr_nOE) ? 16'bzzzzzzzzzzzzzzzz : {8'b0, datalatch};
        assign cr_A = (addrlatch[15:14] == 2'b00) ? /* extrom, home bank */ {9'b0,addrlatch[13:0]} :
                        (addrlatch[15:14] == 2'b01) ? /* extrom, paged bank */ {rombank, addrlatch[13:0]} :
                        (addrlatch[15:13] == 3'b101) ? /* extram */ {1'b1, 5'b0, rambank, addrlatch[12:0]} :
-                       (addrlatch == ADDR_PROGDATA) ? progaddr :
+                       ((addrlatch == ADDR_PROGDATA) || (addrlatch == ADDR_PROGFLASH)) ? progaddr :
                        23'b0;
        
        always @(posedge clk) begin
@@ -229,9 +234,10 @@ module CoreTop(
        input serin,
        output wire [3:0] digits,
        output wire [7:0] seven,
-       output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK,
+       output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK, st_nCE, st_nRST,
        output wire [22:0] cr_A,
        inout [15:0] cr_DQ,
+       input ps2c, ps2d,
 `endif
        output wire hs, vs,
        output wire [2:0] r, g,
@@ -256,15 +262,17 @@ module CoreTop(
        IBUFG iclkbuf(.O(xtalb), .I(xtal));
        CPUDCM dcm (.CLKIN_IN(xtalb), .CLKFX_OUT(clk));
        pixDCM pixdcm (.CLKIN_IN(xtalb), .CLKFX_OUT(vgaclk));
+       wire [7:0] ps2buttons;
 `endif
 
        wire [15:0] addr [1:0];
        wire [7:0] data [1:0];
        wire wr [1:0], rd [1:0];
        
-       wire irq, tmrirq, lcdcirq, vblankirq;
+       wire irq, tmrirq, lcdcirq, vblankirq, btnirq;
        wire [7:0] jaddr;
        wire [1:0] state;
+       wire ack;
        
        GBZ80Core core(
                .clk(clk),
@@ -277,6 +285,7 @@ module CoreTop(
                .bus1wr(wr[1]),
                .bus1rd(rd[1]),
                .irq(irq),
+               .irqack(ack),
                .jaddr(jaddr),
                .state(state));
        
@@ -310,7 +319,9 @@ module CoreTop(
                .cr_nUB(cr_nUB),
                .cr_CLK(cr_CLK),
                .cr_A(cr_A),
-               .cr_DQ(cr_DQ));
+               .cr_DQ(cr_DQ),
+               .st_nCE(st_nCE),
+               .st_nRST(st_nRST));
 `endif
        
        wire lcdhs, lcdvs, lcdclk;
@@ -346,15 +357,45 @@ module CoreTop(
                .vgag(g),
                .vgab(b));
 
+       wire [7:0] sleds;
+`ifdef isim
+       assign leds = sleds;
+`else
+       assign leds = sleds | ps2buttons;
+`endif
        Switches sw(
                .clk(clk),
                .address(addr[0]),
                .data(data[0]),
                .wr(wr[0]),
                .rd(rd[0]),
-               .ledout(leds),
+               .ledout(sleds),
                .switches(switches)
                );
+       
+`ifdef isim
+`else
+       PS2Button ps2(
+               .clk(clk),
+               .inclk(ps2c),
+               .indata(ps2d),
+               .buttons(ps2buttons)
+               );
+`endif
+       
+       Buttons ass(
+               .core_clk(clk),
+               .addr(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0]),
+               .int(btnirq),
+       `ifdef isim
+               .buttons(switches)
+       `else
+               .buttons(ps2buttons)
+       `endif
+               );
 
        AddrMon amon(
                .clk(clk), 
@@ -413,8 +454,9 @@ module CoreTop(
                .lcdc(lcdcirq),
                .tovf(tmrirq),
                .serial(1'b0),
-               .buttons(1'b0),
+               .buttons(btnirq),
                .master(irq),
+               .ack(ack),
                .jaddr(jaddr));
        
        Soundcore sound(