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optionally check ranges in ahb_to_axi4
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@wsipak
wsipak committed Dec 6, 2024
1 parent 6988797 commit c38b1cd
Showing 1 changed file with 39 additions and 29 deletions.
68 changes: 39 additions & 29 deletions design/lib/ahb_to_axi4.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,9 @@ module ahb_to_axi4
import el2_pkg::*;
#(
TAG = 1,
CHECK_RANGES = 1,
`include "el2_param.vh"
)
// ,TAG = 1)
(
input clk,
input rst_l,
Expand Down Expand Up @@ -207,15 +207,23 @@ import el2_pkg::*;
assign ahb_hready = ahb_hreadyout & ahb_hreadyin;
assign ahb_htrans_in[1:0] = {2{ahb_hsel}} & ahb_htrans[1:0];
assign ahb_hrdata[63:0] = buf_rdata[63:0];
assign ahb_hresp = ((ahb_htrans_q[1:0] != 2'b0) & (buf_state != IDLE) &

if (CHECK_RANGES) begin
assign ahb_hresp = ((ahb_htrans_q[1:0] != 2'b0) & (buf_state != IDLE) &
((~(ahb_addr_in_dccm | ahb_addr_in_iccm)) | // request not for ICCM or DCCM
((ahb_addr_in_iccm | (ahb_addr_in_dccm & ahb_hwrite_q)) & ~((ahb_hsize_q[1:0] == 2'b10) | (ahb_hsize_q[1:0] == 2'b11))) | // ICCM Rd/Wr OR DCCM Wr not the right size
((ahb_hsize_q[2:0] == 3'h1) & ahb_haddr_q[0]) | // HW size but unaligned
((ahb_hsize_q[2:0] == 3'h2) & (|ahb_haddr_q[1:0])) | // W size but unaligned
((ahb_hsize_q[2:0] == 3'h3) & (|ahb_haddr_q[2:0])))) | // DW size but unaligned
buf_read_error | // Read ECC error
(ahb_hresp_q & ~ahb_hready_q);
end else begin // !CHECK_RANGES
assign ahb_hresp = ((ahb_htrans_q[1:0] != 2'b0) & (buf_state != IDLE) &
(((ahb_hsize_q[2:0] == 3'h1) & ahb_haddr_q[0]) | // HW size but unaligned
((ahb_hsize_q[2:0] == 3'h2) & (|ahb_haddr_q[1:0])) | // W size but unaligned
((ahb_hsize_q[2:0] == 3'h3) & (|ahb_haddr_q[2:0])))) | // DW size but unaligned
buf_read_error | // Read ECC error
(ahb_hresp_q & ~ahb_hready_q);
end // CHECK_RANGES

// Buffer signals - needed for the read data and ECC error response
rvdff_fpga #(.WIDTH(64)) buf_rdata_ff (.din(axi_rdata[63:0]), .dout(buf_rdata[63:0]), .clk(buf_rdata_clk), .clken(buf_rdata_clk_en), .rawclk(clk), .*);
Expand All @@ -229,34 +237,36 @@ import el2_pkg::*;
rvdff_fpga #(.WIDTH(1)) hwrite_ff (.din(ahb_hwrite), .dout(ahb_hwrite_q), .clk(ahb_addr_clk), .clken(ahb_addr_clk_en), .rawclk(clk), .*);
rvdff_fpga #(.WIDTH(32)) haddr_ff (.din(ahb_haddr[31:0]), .dout(ahb_haddr_q[31:0]), .clk(ahb_addr_clk), .clken(ahb_addr_clk_en), .rawclk(clk), .*);

// Address check dccm
rvrangecheck #(.CCM_SADR(pt.DCCM_SADR),
.CCM_SIZE(pt.DCCM_SIZE)) addr_dccm_rangecheck (
.addr(ahb_haddr_q[31:0]),
.in_range(ahb_addr_in_dccm),
.in_region(ahb_addr_in_dccm_region_nc)
);

// Address check iccm
if (pt.ICCM_ENABLE == 1) begin: GenICCM
rvrangecheck #(.CCM_SADR(pt.ICCM_SADR),
.CCM_SIZE(pt.ICCM_SIZE)) addr_iccm_rangecheck (
if (CHECK_RANGES) begin
// Address check dccm
rvrangecheck #(.CCM_SADR(pt.DCCM_SADR),
.CCM_SIZE(pt.DCCM_SIZE)) addr_dccm_rangecheck (
.addr(ahb_haddr_q[31:0]),
.in_range(ahb_addr_in_dccm),
.in_region(ahb_addr_in_dccm_region_nc)
);

// Address check iccm
if (pt.ICCM_ENABLE == 1) begin: GenICCM
rvrangecheck #(.CCM_SADR(pt.ICCM_SADR),
.CCM_SIZE(pt.ICCM_SIZE)) addr_iccm_rangecheck (
.addr(ahb_haddr_q[31:0]),
.in_range(ahb_addr_in_iccm),
.in_region(ahb_addr_in_iccm_region_nc)
);
end else begin: GenNoICCM
assign ahb_addr_in_iccm = '0;
assign ahb_addr_in_iccm_region_nc = '0;
end

// PIC memory address check
rvrangecheck #(.CCM_SADR(pt.PIC_BASE_ADDR),
.CCM_SIZE(pt.PIC_SIZE)) addr_pic_rangecheck (
.addr(ahb_haddr_q[31:0]),
.in_range(ahb_addr_in_iccm),
.in_region(ahb_addr_in_iccm_region_nc)
.in_range(ahb_addr_in_pic),
.in_region(ahb_addr_in_pic_region_nc)
);
end else begin: GenNoICCM
assign ahb_addr_in_iccm = '0;
assign ahb_addr_in_iccm_region_nc = '0;
end

// PIC memory address check
rvrangecheck #(.CCM_SADR(pt.PIC_BASE_ADDR),
.CCM_SIZE(pt.PIC_SIZE)) addr_pic_rangecheck (
.addr(ahb_haddr_q[31:0]),
.in_range(ahb_addr_in_pic),
.in_region(ahb_addr_in_pic_region_nc)
);
end // CHECK_RANGES

// Command Buffer - Holding for the commands to be sent for the AXI. It will be converted to the AXI signals.
assign cmdbuf_rst = (((axi_awvalid & axi_awready) | (axi_arvalid & axi_arready)) & ~cmdbuf_wr_en) | (ahb_hresp & ~cmdbuf_write);
Expand Down

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