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57 lines
2.9 KiB
Systemverilog
57 lines
2.9 KiB
Systemverilog
///////////////////////////////////////////
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// adrdecs.sv
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//
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// Written: David_Harris@hmc.edu 22 June 2021
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// Modified:
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//
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// Purpose: All the address decoders for peripherals
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//
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// Documentation: RISC-V System on Chip Design Chapter 8
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//
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// A component of the CORE-V-WALLY configurable RISC-V project.
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//
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// Copyright (C) 2021-23 Harvey Mudd College & Oklahoma State University
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//
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// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
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//
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// Licensed under the Solderpad Hardware License v 2.1 (the “License”); you may not use this file
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// except in compliance with the License, or, at your option, the Apache License version 2.0. You
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// may obtain a copy of the License at
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//
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// https://solderpad.org/licenses/SHL-2.1/
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//
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// Unless required by applicable law or agreed to in writing, any work distributed under the
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// License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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////////////////////////////////////////////////////////////////////////////////////////////////
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`include "wally-config.vh"
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// verilator lint_off UNOPTFLAT
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module adrdecs (
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input logic [`PA_BITS-1:0] PhysicalAddress,
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input logic AccessRW, AccessRX, AccessRWX,
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input logic [1:0] Size,
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output logic [10:0] SelRegions
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);
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localparam logic [3:0] SUPPORTED_SIZE = (`LLEN == 32 ? 4'b0111 : 4'b1111);
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// Determine which region of physical memory (if any) is being accessed
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adrdec dtimdec(PhysicalAddress, `DTIM_BASE, `DTIM_RANGE, `DTIM_SUPPORTED, AccessRWX, Size, SUPPORTED_SIZE, SelRegions[10]);
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adrdec iromdec(PhysicalAddress, `IROM_BASE, `IROM_RANGE, `IROM_SUPPORTED, AccessRWX, Size, SUPPORTED_SIZE, SelRegions[9]);
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adrdec ddr4dec(PhysicalAddress, `EXT_MEM_BASE, `EXT_MEM_RANGE, `EXT_MEM_SUPPORTED, AccessRWX, Size, SUPPORTED_SIZE, SelRegions[8]);
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adrdec bootromdec(PhysicalAddress, `BOOTROM_BASE, `BOOTROM_RANGE, `BOOTROM_SUPPORTED, AccessRX, Size, SUPPORTED_SIZE, SelRegions[7]);
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adrdec uncoreramdec(PhysicalAddress, `UNCORE_RAM_BASE, `UNCORE_RAM_RANGE, `UNCORE_RAM_SUPPORTED, AccessRWX, Size, SUPPORTED_SIZE, SelRegions[6]);
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adrdec clintdec(PhysicalAddress, `CLINT_BASE, `CLINT_RANGE, `CLINT_SUPPORTED, AccessRW, Size, SUPPORTED_SIZE, SelRegions[5]);
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adrdec gpiodec(PhysicalAddress, `GPIO_BASE, `GPIO_RANGE, `GPIO_SUPPORTED, AccessRW, Size, 4'b0100, SelRegions[4]);
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adrdec uartdec(PhysicalAddress, `UART_BASE, `UART_RANGE, `UART_SUPPORTED, AccessRW, Size, 4'b0001, SelRegions[3]);
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adrdec plicdec(PhysicalAddress, `PLIC_BASE, `PLIC_RANGE, `PLIC_SUPPORTED, AccessRW, Size, 4'b0100, SelRegions[2]);
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adrdec sdcdec(PhysicalAddress, `SDC_BASE, `SDC_RANGE, `SDC_SUPPORTED, AccessRW, Size, SUPPORTED_SIZE & 4'b1100, SelRegions[1]);
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assign SelRegions[0] = ~|(SelRegions[10:1]); // none of the regions are selected
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endmodule
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// verilator lint_on UNOPTFLAT
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