[flash_ctrl] Allow fixed priority arbiter
- allow prim_arbiter_tree_dup to instantiate either rr or fixed priority
arbiters
- switch phy arbitration to fixed priority since host most of the time
has priority over controller
Signed-off-by: Timothy Chen <timothytim@google.com>
diff --git a/hw/ip/prim/rtl/prim_arbiter_tree_dup.sv b/hw/ip/prim/rtl/prim_arbiter_tree_dup.sv
index 58d7abb..8ed2a7c 100644
--- a/hw/ip/prim/rtl/prim_arbiter_tree_dup.sv
+++ b/hw/ip/prim/rtl/prim_arbiter_tree_dup.sv
@@ -20,6 +20,9 @@
// EnDataPort: {0, 1}, if 0, input data will be ignored
parameter bit EnDataPort = 1,
+ // if arbiter has fixed priority
+ parameter bit FixedArb = 0,
+
// Derived parameters
localparam int IdxW = $clog2(N)
) (
@@ -77,22 +80,43 @@
);
end
- prim_arbiter_tree #(
- .N(N),
- .DW(DW),
- .EnDataPort(EnDataPort)
- ) u_arb (
- .clk_i,
- .rst_ni,
- .req_chk_i,
- .req_i(req_buf),
- .data_i(data_buf),
- .gnt_o(arb_output_buf[i].gnt),
- .idx_o(arb_output_buf[i].idx),
- .valid_o(arb_output_buf[i].valid),
- .data_o(arb_output_buf[i].data),
- .ready_i
- );
+ if (FixedArb) begin : gen_fixed_arbiter
+ prim_arbiter_fixed #(
+ .N(N),
+ .DW(DW),
+ .EnDataPort(EnDataPort)
+ ) u_arb (
+ .clk_i,
+ .rst_ni,
+ .req_i(req_buf),
+ .data_i(data_buf),
+ .gnt_o(arb_output_buf[i].gnt),
+ .idx_o(arb_output_buf[i].idx),
+ .valid_o(arb_output_buf[i].valid),
+ .data_o(arb_output_buf[i].data),
+ .ready_i
+ );
+ logic unused_req_chk;
+ assign unused_req_chk = req_chk_i;
+
+ end else begin : gen_rr_arbiter
+ prim_arbiter_tree #(
+ .N(N),
+ .DW(DW),
+ .EnDataPort(EnDataPort)
+ ) u_arb (
+ .clk_i,
+ .rst_ni,
+ .req_chk_i,
+ .req_i(req_buf),
+ .data_i(data_buf),
+ .gnt_o(arb_output_buf[i].gnt),
+ .idx_o(arb_output_buf[i].idx),
+ .valid_o(arb_output_buf[i].valid),
+ .data_o(arb_output_buf[i].data),
+ .ready_i
+ );
+ end
end
// the last buffered position is sent out
