Author: matt
Date: 2007-11-14 03:32:57 -0700 (Wed, 14 Nov 2007)
New Revision: 6895
Modified:
gnuradio/branches/developers/matt/u2f/control_lib/icache.v
Log:
added simple forwarding, now only has 1 wasted cycle on cache misses
Modified: gnuradio/branches/developers/matt/u2f/control_lib/icache.v
===================================================================
--- gnuradio/branches/developers/matt/u2f/control_lib/icache.v 2007-11-14
09:31:30 UTC (rev 6894)
+++ gnuradio/branches/developers/matt/u2f/control_lib/icache.v 2007-11-14
10:32:57 UTC (rev 6895)
@@ -56,8 +56,30 @@
wire valid_out = ivalid[line];
// //////////////////////////////////////
- // Very basic, no forwarding
+ // Send data and ack to uP
+
+//`define BASIC
+`define LEVEL2
+//`define LEVEL3
+
+ wire cache_hit = ivalid[line] & (tag_out ==
iwb_adr_i[AWIDTH-1:CWIDTH+2]);
+ wire cache_miss = ~cache_hit;
+ reg ack_d1;
+ always @(posedge wb_clk_i) ack_d1 <= iwb_ack_o;
+
+`ifdef BASIC // Very basic, no forwarding
assign iwb_dat_o = idata[line];
- assign iwb_ack_o = ivalid[line] &
- (tag_out == iwb_adr_i[AWIDTH-1:CWIDTH+2]);
+ assign iwb_ack_o = cache_hit;
+`endif
+
+`ifdef LEVEL2 // Simple forwarding
+ assign iwb_dat_o = cache_hit ? idata[line] : iram_dat;
+ assign iwb_ack_o = cache_hit | ~ack_d1;
+`endif
+
+`ifdef LEVEL3
+
+`endif
+
+
endmodule // icache
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