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rob: Add wrapper to select between different RoB + support NoRoB
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| // Copyright 2023 ETH Zurich and University of Bologna. | ||
| // Solderpad Hardware License, Version 0.51, see LICENSE for details. | ||
| // SPDX-License-Identifier: SHL-0.51 | ||
| // | ||
| // Author: Tim Fischer <[email protected]> | ||
|
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||
| /// A wrapper of all available reorder buffers | ||
| module floo_rob_wrapper | ||
| import floo_pkg::*; | ||
| #( | ||
| /// Type of reorder buffer to use | ||
| parameter rob_type_e RoBType = NormalRoB, | ||
| /// Maximum number of transactions in flight per ID which *require* reordering | ||
| parameter int unsigned MaxRoTxnsPerId = 32'd32, | ||
| /// If the response only consists of small metadata i.e. B channel | ||
| /// In this case no SRAM will be instantied and the response will be | ||
| /// metadata will be stored in normal FFs | ||
| parameter bit OnlyMetaData = 1'b0, | ||
| /// Size of the reorder buffer | ||
| parameter int unsigned ReorderBufferSize = 32'd64, | ||
| /// Data type of response to be reordered | ||
| parameter type ax_len_t = logic, | ||
| parameter type ax_id_t = logic, | ||
| parameter type rsp_chan_t = logic, | ||
| parameter type rsp_data_t = logic, | ||
| parameter type rsp_meta_t = logic, | ||
| parameter type rob_idx_t = logic, | ||
| parameter type dest_t = logic, | ||
| // Type for implementation inputs and outputs | ||
| parameter type sram_cfg_t = logic | ||
| ) ( | ||
| input logic clk_i, | ||
| input logic rst_ni, | ||
| input sram_cfg_t sram_cfg_i, | ||
| input logic ax_valid_i, | ||
| output logic ax_ready_o, | ||
| input ax_len_t ax_len_i, | ||
| input ax_id_t ax_id_i, | ||
| input dest_t ax_dest_i, | ||
| output logic ax_valid_o, | ||
| input logic ax_ready_i, | ||
| output logic ax_rob_req_o, | ||
| output rob_idx_t ax_rob_idx_o, | ||
| input logic rsp_valid_i, | ||
| output logic rsp_ready_o, | ||
| input rsp_chan_t rsp_i, | ||
| input logic rsp_rob_req_i, | ||
| input rob_idx_t rsp_rob_idx_i, | ||
| input logic rsp_last_i, | ||
| output logic rsp_valid_o, | ||
| input logic rsp_ready_i, | ||
| output rsp_chan_t rsp_o | ||
| ); | ||
|
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||
| if (RoBType == NormalRoB) begin : gen_normal_rob | ||
| floo_rob #( | ||
| .ReorderBufferSize ( ReorderBufferSize ), | ||
| .MaxRoTxnsPerId ( MaxRoTxnsPerId ), | ||
| .OnlyMetaData ( OnlyMetaData ), | ||
| .ax_len_t ( ax_len_t ), | ||
| .ax_id_t ( ax_id_t ), | ||
| .rsp_chan_t ( rsp_chan_t ), | ||
| .rsp_data_t ( rsp_data_t ), | ||
| .rsp_meta_t ( rsp_meta_t ), | ||
| .rob_idx_t ( rob_idx_t ), | ||
| .dest_t ( dest_t ), | ||
| .sram_cfg_t ( sram_cfg_t ) | ||
| ) i_rob ( | ||
| .clk_i, | ||
| .rst_ni, | ||
| .sram_cfg_i, | ||
| .ax_valid_i, | ||
| .ax_ready_o, | ||
| .ax_len_i, | ||
| .ax_id_i, | ||
| .ax_dest_i, | ||
| .ax_valid_o, | ||
| .ax_ready_i, | ||
| .ax_rob_req_o, | ||
| .ax_rob_idx_o, | ||
| .rsp_valid_i, | ||
| .rsp_ready_o, | ||
| .rsp_i, | ||
| .rsp_rob_req_i, | ||
| .rsp_rob_idx_i, | ||
| .rsp_last_i, | ||
| .rsp_valid_o, | ||
| .rsp_ready_i, | ||
| .rsp_o | ||
| ); | ||
|
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||
| end else if (RoBType == SimpleRoB) begin : gen_simpl_rob | ||
| floo_simple_rob #( | ||
| .ReorderBufferSize ( ReorderBufferSize ), | ||
| .MaxRoTxnsPerId ( MaxRoTxnsPerId ), | ||
| .OnlyMetaData ( OnlyMetaData ), | ||
| .ax_len_t ( ax_len_t ), | ||
| .rsp_chan_t ( rsp_chan_t ), | ||
| .rsp_data_t ( rsp_data_t ), | ||
| .rsp_meta_t ( rsp_meta_t ), | ||
| .rob_idx_t ( rob_idx_t ), | ||
| .dest_t ( dest_t ), | ||
| .sram_cfg_t ( sram_cfg_t ) | ||
| ) i_rob ( | ||
| .clk_i, | ||
| .rst_ni, | ||
| .sram_cfg_i, | ||
| .ax_valid_i, | ||
| .ax_ready_o, | ||
| .ax_len_i, | ||
| .ax_dest_i, | ||
| .ax_valid_o, | ||
| .ax_ready_i, | ||
| .ax_rob_req_o, | ||
| .ax_rob_idx_o, | ||
| .rsp_valid_i, | ||
| .rsp_ready_o, | ||
| .rsp_i, | ||
| .rsp_rob_req_i, | ||
| .rsp_rob_idx_i, | ||
| .rsp_last_i, | ||
| .rsp_valid_o, | ||
| .rsp_ready_i, | ||
| .rsp_o | ||
| ); | ||
|
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||
| end else if (RoBType == NoRoB) begin : gen_no_rob | ||
|
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| localparam int unsigned AxiIdBits = $bits(ax_id_i); | ||
| localparam int unsigned CounterWidth = $clog2(MaxRoTxnsPerId); | ||
|
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| logic push, pop; | ||
| logic in_flight; | ||
| dest_t prev_dest; | ||
|
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| // A new transaction can be pushed if it is the first one | ||
| // i.e. `in_flight` is not set or if the previous transaction | ||
| // has the same destination | ||
| assign push = ax_valid_i && (!in_flight || ax_dest_i == prev_dest); | ||
| // Whenever a response arrives we can pop the transaction | ||
| assign pop = rsp_valid_i && rsp_last_i; | ||
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| assign ax_valid_o = push; | ||
| assign ax_ready_o = push && ax_ready_i; | ||
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| assign ax_rob_req_o = 1'b1; | ||
| assign ax_rob_idx_o = '0; | ||
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| assign rsp_ready_o = rsp_ready_i; | ||
| assign rsp_valid_o = rsp_valid_i; | ||
| assign rsp_o = rsp_i; | ||
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| axi_demux_id_counters #( | ||
| .AxiIdBits ( AxiIdBits ), | ||
| .CounterWidth ( CounterWidth ), | ||
| .mst_port_select_t ( dest_t ) | ||
| ) i_axi_demux_id_counters ( | ||
| .clk_i, | ||
| .rst_ni, | ||
| .lookup_axi_id_i ( ax_id_i ), | ||
| .lookup_mst_select_o ( prev_dest ), | ||
| .lookup_mst_select_occupied_o ( in_flight ), | ||
| .full_o ( /* TODO */ ), | ||
| .push_axi_id_i ( ax_id_i ), | ||
| .push_mst_select_i ( ax_dest_i ), | ||
| .push_i ( push && ax_ready_i ), // Only push on handshake | ||
| .inject_axi_id_i ( '0 ), | ||
| .inject_i ( 1'b0 ), | ||
| .pop_axi_id_i ( rsp_i.id ), | ||
| .pop_i ( pop && rsp_ready_i ) // Only pop on handshake | ||
| ); | ||
|
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| end else begin | ||
| $error("Unknown RoB type %0d", RoBType); | ||
| end | ||
|
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||
| endmodule |
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