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| author | Matt Ettus <matt@ettus.com> | 2010-02-25 18:38:07 -0800 |
|---|---|---|
| committer | Matt Ettus <matt@ettus.com> | 2010-02-25 18:38:07 -0800 |
| commit | 2f9b93f32ed8e561a0e92e2e32af03707475011c (patch) | |
| tree | 8364826d99b925f5f7f6b248d025737d57e4ac12 /usrp2/gpmc/gpmc.v | |
| parent | 17dd91290bfba1d2a3cf66666e634ddf00e3b34e (diff) | |
| download | uhd-2f9b93f32ed8e561a0e92e2e32af03707475011c.tar.gz uhd-2f9b93f32ed8e561a0e92e2e32af03707475011c.tar.bz2 uhd-2f9b93f32ed8e561a0e92e2e32af03707475011c.zip | |
edge sync on done signals so we only fill/empty one buffer
Diffstat (limited to 'usrp2/gpmc/gpmc.v')
| -rw-r--r-- | usrp2/gpmc/gpmc.v | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/usrp2/gpmc/gpmc.v b/usrp2/gpmc/gpmc.v index 91d02bfec..831df3b4c 100644 --- a/usrp2/gpmc/gpmc.v +++ b/usrp2/gpmc/gpmc.v @@ -32,7 +32,11 @@ module gpmc // //////////////////////////////////////////// // Write path wire read_sel_in, write_sel_in, clear_in; - wire write_done_in = ~EM_NCS4 & ~EM_NWE & (EM_A == 10'h3FF); + wire write_done_in; + + edge_sync #(.POSEDGE(0)) + edge_sync_wdi(.clk(wb_clk), .rst(wb_rst), + .sig(~EM_NCS4 & ~EM_NWE & (EM_A == 10'h3FF)), .trig(write_done_in)); ram_2port_mixed_width buffer_in (.clk16(wb_clk), .en16(~EM_NCS4), .we16(~EM_NWE), .addr16({write_sel_in,EM_A}), .di16(EM_D), .do16(), @@ -47,7 +51,11 @@ module gpmc // //////////////////////////////////////////// // Read path wire read_sel_out, write_sel_out, clear_out; - wire read_done_out = ~EM_NCS4 & ~EM_NOE & (EM_A == 10'h3FF); + wire read_done_out; + + edge_sync #(.POSEDGE(0)) + edge_sync_rdo(.clk(wb_clk), .rst(wb_rst), + .sig(~EM_NCS4 & ~EM_NOE & (EM_A == 10'h3FF)), .trig(read_done_out)); ram_2port_mixed_width buffer_out (.clk16(wb_clk), .en16(~EM_NCS4), .we16(0), .addr16({read_sel_out,EM_A}), .di16(0), .do16(EM_D_ram), |