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Some cleanup and added formal for the banks and timer

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This commit is contained in:
Joppe Blondel
2026-03-01 14:12:12 +01:00
parent 8289b0d090
commit 7b46ae5e87
9 changed files with 226 additions and 14 deletions
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10
cores/wb/formal_checker/formal/formal_wb_master_checker.v
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@@ -75,12 +75,10 @@ module formal_wb_master_checker (
// C1: We eventually get an ACK during an active request
cover(f_past_valid && !i_rst && !i_wb_rst && i_wb_cyc && i_wb_stb && o_wb_ack);
// C2: ACK in the *same* cycle as the request (allowed by your A1)
cover(f_past_valid && !i_rst && !i_wb_rst && (i_wb_cyc && i_wb_stb) && o_wb_ack);
// C3: ACK one cycle *after* the request (also allowed by your A1)
// cover(f_past_valid && !i_rst && !i_wb_rst &&
// $past(i_wb_cyc && i_wb_stb) && o_wb_ack && !(i_wb_cyc && i_wb_stb));
// C2: A delayed ACK occurs for a request issued in a previous cycle.
// This does not require the request to drop in the ACK cycle.
cover(f_past_valid && !i_rst && !i_wb_rst &&
$past(i_wb_cyc && i_wb_stb) && o_wb_ack);
// C4: A “wait state” happens: request asserted, no ACK for at least 1 cycle
cover(f_past_valid && !i_rst && !i_wb_rst &&

23
cores/wb/formal_checker/formal/formal_wb_slave_checker.v
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@@ -1,6 +1,8 @@
`timescale 1ns/1ps
module formal_wb_slave_checker (
module formal_wb_slave_checker #(
parameter combinatorial_ack = 0
) (
input wire i_clk,
input wire i_rst,
input wire i_wb_rst,
@@ -73,14 +75,19 @@ module formal_wb_slave_checker (
// C2: ACK happens during a request (basic progress)
cover(f_past_valid && !i_rst && !i_wb_rst && i_wb_cyc && i_wb_stb && o_wb_ack);
// C3: ACK same-cycle vs one-cycle-late (mirrors your R1 definition)
cover(f_past_valid && !i_rst && !i_wb_rst && (i_wb_cyc && i_wb_stb) && o_wb_ack);
cover(f_past_valid && !i_rst && !i_wb_rst && $past(i_wb_cyc && i_wb_stb) && o_wb_ack);
// C3: Exercise the expected ACK timing style for this slave.
if (combinatorial_ack) begin
cover(f_past_valid && !i_rst && !i_wb_rst &&
(i_wb_cyc && i_wb_stb) && o_wb_ack);
end else begin
cover(f_past_valid && !i_rst && !i_wb_rst &&
$past(i_wb_cyc && i_wb_stb) && o_wb_ack);
// C4: “wait state” from the slave POV: request persists without ACK
cover(f_past_valid && !i_rst && !i_wb_rst &&
$past(i_wb_cyc && i_wb_stb && !o_wb_ack) &&
(i_wb_cyc && i_wb_stb && !o_wb_ack));
// C4: Wait-state behavior for registered/non-zero-wait slaves.
cover(f_past_valid && !i_rst && !i_wb_rst &&
$past(i_wb_cyc && i_wb_stb && !o_wb_ack) &&
(i_wb_cyc && i_wb_stb && !o_wb_ack));
end
// C5: Master ends a cycle (CYC drops) after at least one request
cover(f_past_valid && !i_rst && !i_wb_rst &&