uzix/zx-sizif-512-ext
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cpld: make additional 32Kb of RAM available for GS

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This commit is contained in:
Eugene Lozovoy
2022-11-11 22:01:40 +03:00
parent 718128c7e6
commit 2b496198bb
1 changed files with 2 additions and 2 deletions
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4
cpld/rtl/top.v
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@ -171,7 +171,7 @@ end
/* GS INTERNAL REGISTERS */
reg [7:0] gs_reg00, gs_reg03;
wire [3:0] gs_page = gs_reg00[3:0];
wire [4:0] gs_page = gs_reg00[4:0];
reg [5:0] gs_vol0, gs_vol1, gs_vol2, gs_vol3;
always @(posedge clk32 or negedge rst_n) begin
if (!rst_n) begin
@ -263,7 +263,7 @@ end
/* GS BUS CONTROLLER */
assign n_grom = (~n_gmreq && ((ga[15:14] == 2'b00) || (ga[15] == 1'b1 && gs_page == 0)))? 1'b0 : 1'b1;
assign n_gram = (~n_gmreq && n_grom)? 1'b0 : 1'b1;
assign gma = (ga[15] == 1'b0)? 4'b0001 : gs_page;
assign gma = (ga[15] == 1'b0)? 4'b0001 : gs_page[3:0];
assign gd =
(~n_giorq && ~n_grd && ga[3:0] == 4'h4)? gs_status :
(~n_giorq && ~n_grd && ga[3:0] == 4'h2)? gs_regb3 :