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Modified address decoder for native access to CLINT

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This commit is contained in:
David Harris 2022-02-28 19:13:14 +00:00
parent 3519a20ccf
commit e108eb5195
1 changed files with 3 additions and 1 deletions
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4
pipelined/src/mmu/adrdecs.sv
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@ -37,6 +37,7 @@ module adrdecs (
input logic [1:0] Size,
output logic [8:0] SelRegions
);
logic [3:0] clintaccesssize;
// Determine which region of physical memory (if any) is being accessed
// *** eventually uncomment Access signals
@ -44,7 +45,8 @@ module adrdecs (
adrdec boottimdec(PhysicalAddress, `BOOTROM_BASE, `BOOTROM_RANGE, `BOOTROM_SUPPORTED, /*1'b1*/AccessRX, Size, 4'b1111, SelRegions[6]);
adrdec timdec(PhysicalAddress, `RAM_BASE, `RAM_RANGE, `RAM_SUPPORTED, /*1'b1*/AccessRWX, Size, 4'b1111, SelRegions[5]);
adrdec clintdec(PhysicalAddress, `CLINT_BASE, `CLINT_RANGE, `CLINT_SUPPORTED, AccessRW, Size, 4'b1111, SelRegions[4]);
assign clintaccesssize = (`XLEN==64) ? 4'b1000 : 4'b0100;
adrdec clintdec(PhysicalAddress, `CLINT_BASE, `CLINT_RANGE, `CLINT_SUPPORTED, AccessRW, Size, clintaccesssize, SelRegions[4]);
adrdec gpiodec(PhysicalAddress, `GPIO_BASE, `GPIO_RANGE, `GPIO_SUPPORTED, AccessRW, Size, 4'b0100, SelRegions[3]);
adrdec uartdec(PhysicalAddress, `UART_BASE, `UART_RANGE, `UART_SUPPORTED, AccessRW, Size, 4'b0001, SelRegions[2]);
adrdec plicdec(PhysicalAddress, `PLIC_BASE, `PLIC_RANGE, `PLIC_SUPPORTED, AccessRW, Size, 4'b0100, SelRegions[1]);