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Updated synthesis results for BTB

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This commit is contained in:
Florian Zaruba 2017-04-19 20:27:46 +02:00
parent cfb2e8918c
commit 97d8468c85
2 changed files with 15 additions and 1 deletions
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3
btb.sv
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@ -19,7 +19,7 @@
import ariane_pkg::*;
module btb #(
parameter int NR_ENTRIES = 32,
parameter int NR_ENTRIES = 64,
parameter int BITS_SATURATION_COUNTER = 2
)
(
@ -62,6 +62,7 @@ module btb #(
saturation_counter = btb_q[$unsigned(update_pc)].saturation_counter;
if (misspredict_i.valid) begin
btb_n[$unsigned(update_pc)].valid = 1'b1;
// update saturation counter
// first check if counter is already saturated in the positive regime e.g.: branch taken
if (saturation_counter == {BITS_SATURATION_COUNTER{1'b1}} && ~misspredict_i.is_taken) begin

13
docs/synthesis.md
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@ -21,3 +21,16 @@ Synthesized @ 0.4 ns, worst case, UMC65:
| Buffer | 582 |
| **Total** | **9019 (~6.4 kGE)** |
## BTB
Synthesized @ 1.1 ns, worst case, UMC65
| **Type** | **64 entries** | **32 entries** |
|---------------|---------------------|---------------------|
| Sequential | 4288 | 2113 |
| Combinatorial | 7901 | 5923 |
| Buffer | 342 | 2276 |
| **Total** | **55490 (~39 kGE)** | **29327 (~20 kGE)** |