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[rtl] Add B extension to misa

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Reflect the availability of the B extension in the misa register.
This commit is contained in:
Tobias Wölfel 2021-01-18 14:13:11 +01:00 • committed by Tobias Wölfel
parent 0f2dc5c64a
commit ca31ca43f3
3 changed files with 10 additions and 4 deletions
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6
dv/cs_registers/tb/tb_cs_registers.sv
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@ -11,7 +11,8 @@ module tb_cs_registers #(
parameter int unsigned PMPGranularity = 0,
parameter int unsigned PMPNumRegions = 4,
parameter bit RV32E = 1'b0,
parameter ibex_pkg::rv32m_e RV32M = ibex_pkg::RV32MFast
parameter ibex_pkg::rv32m_e RV32M = ibex_pkg::RV32MFast,
parameter ibex_pkg::rv32b_e RV32B = ibex_pkg::RV32BNone
) (
// Clock and Reset
inout logic clk_i,
@ -64,7 +65,8 @@ module tb_cs_registers #(
.PMPGranularity (PMPGranularity),
.PMPNumRegions (PMPNumRegions),
.RV32E (RV32E),
.RV32M (RV32M)
.RV32M (RV32M),
.RV32B (RV32B)
) i_cs_regs (
.clk_i (clk_i),
.rst_ni (rst_ni),

3
rtl/ibex_core.sv
View file

@ -977,7 +977,8 @@ module ibex_core #(
.PMPGranularity ( PMPGranularity ),
.PMPNumRegions ( PMPNumRegions ),
.RV32E ( RV32E ),
.RV32M ( RV32M )
.RV32M ( RV32M ),
.RV32B ( RV32B )
) cs_registers_i (
.clk_i ( clk ),
.rst_ni ( rst_ni ),

5
rtl/ibex_cs_registers.sv
View file

@ -25,7 +25,8 @@ module ibex_cs_registers #(
parameter int unsigned PMPGranularity = 0,
parameter int unsigned PMPNumRegions = 4,
parameter bit RV32E = 0,
parameter ibex_pkg::rv32m_e RV32M = ibex_pkg::RV32MFast
parameter ibex_pkg::rv32m_e RV32M = ibex_pkg::RV32MFast,
parameter ibex_pkg::rv32b_e RV32B = ibex_pkg::RV32BNone
) (
// Clock and Reset
input logic clk_i,
@ -119,12 +120,14 @@ module ibex_cs_registers #(
import ibex_pkg::*;
localparam int unsigned RV32BEnabled = (RV32B == RV32BNone) ? 0 : 1;
localparam int unsigned RV32MEnabled = (RV32M == RV32MNone) ? 0 : 1;
localparam int unsigned PMPAddrWidth = (PMPGranularity > 0) ? 33 - PMPGranularity : 32;
// misa
localparam logic [31:0] MISA_VALUE =
(0 << 0) // A - Atomic Instructions extension
| (RV32BEnabled << 1) // B - Bit-Manipulation extension
| (1 << 2) // C - Compressed extension
| (0 << 3) // D - Double precision floating-point extension
| (32'(RV32E) << 4) // E - RV32E base ISA