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Add parameter to disable CSR/interrupts

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Also disables timer in servant if CSR/interrupts are disabled
This commit is contained in:
Olof Kindgren
2019-12-01 20:54:54 +01:00
parent fca1527dd7
commit b48b02b8df
8 changed files with 137 additions and 62 deletions
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10
rtl/serv_ctrl.v
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@@ -25,7 +25,8 @@ module serv_ctrl
output wire o_ibus_cyc,
input wire i_ibus_ack);
parameter RESET_PC = 32'd8;
parameter RESET_PC = 32'd0;
parameter WITH_CSR = 1;
reg en_pc_r;
@@ -66,7 +67,12 @@ module serv_ctrl
.o_par (o_ibus_adr[31:1])
);
assign new_pc = i_trap ? (i_csr_pc & en_pc_r) : i_jump ? pc_plus_offset_aligned : pc_plus_4;
generate
if (WITH_CSR)
assign new_pc = i_trap ? (i_csr_pc & en_pc_r) : i_jump ? pc_plus_offset_aligned : pc_plus_4;
else
assign new_pc = i_jump ? pc_plus_offset_aligned : pc_plus_4;
endgenerate
assign o_rd = (i_utype & pc_plus_offset_aligned) | (pc_plus_4 & i_jal_or_jalr);
assign offset_a = i_pc_rel & pc;