diff options
author | Cluster <clusterrr@clusterrr.com> | 2015-08-07 00:03:47 +0300 |
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committer | Cluster <clusterrr@clusterrr.com> | 2015-08-07 00:03:47 +0300 |
commit | 6439f48d9a59cc4da4589c1dd9a4a082ef8e239c (patch) | |
tree | ff6688e1e845dfb08fb2463c44abacf610fd8095 /7 (AxROM) |
first commit
Diffstat (limited to '7 (AxROM)')
-rw-r--r-- | 7 (AxROM)/AxROM.v | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/7 (AxROM)/AxROM.v b/7 (AxROM)/AxROM.v new file mode 100644 index 0000000..4ee93ac --- /dev/null +++ b/7 (AxROM)/AxROM.v @@ -0,0 +1,53 @@ +module AxROM + ( + output led, + + input m2, + input romsel, + input cpu_rw_in, + output [18:12] cpu_addr_out, + input [14:0] cpu_addr_in, + input [7:0] cpu_data_in, + output cpu_wr_out, + output cpu_rd_out, + output cpu_flash_ce, + output cpu_sram_ce, + + input ppu_rd_in, + input ppu_wr_in, + input [13:10] ppu_addr_in, + output [18:10] ppu_addr_out, + output ppu_rd_out, + output ppu_wr_out, + output ppu_flash_ce, + output ppu_sram_ce, + output ppu_ciram_a10, + output ppu_ciram_ce, + + output irq +); + reg [7:0] bank; + + assign led = ~romsel; + + assign cpu_addr_out[18:12] = {bank[2:0], cpu_addr_in[14:12]}; + assign cpu_wr_out = 1; + assign cpu_rd_out = ~cpu_rw_in; + assign cpu_flash_ce = romsel; + assign cpu_sram_ce = 1; + + assign ppu_rd_out = ppu_rd_in; + assign ppu_wr_out = ppu_wr_in; + assign ppu_flash_ce = 1; + assign ppu_sram_ce = ppu_addr_in[13]; + assign ppu_ciram_a10 = bank[4]; + assign ppu_ciram_ce = ~ppu_addr_in[13]; + + assign irq = 1'bz; + + always @ (posedge romsel) + begin + if (cpu_rw_in == 0) + bank = cpu_data_in; + end +endmodule |