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//
// Copyright 2025 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Module: ctrlport_if_terminator
//
// Description:
//
// Returns an error for all ctrlport requests in given address range.
//
// Parameters:
//
// BASE_ADDRESS : First address to generate response for.
// WINDOW_SIZE : Size of the address space.
// Last address in range will be BASE_ADDRESS + WINDOW_SIZE - 1.
//
module ctrlport_if_terminator #(
int BASE_ADDRESS = 0,
int WINDOW_SIZE = 32
)(
ctrlport_if.slave s_ctrlport
);
import ctrlport_pkg::*;
// drive acknowledgement on requests but not on reset
always_ff @(posedge s_ctrlport.clk) begin
if (s_ctrlport.rst) begin
s_ctrlport.resp.ack <= 1'b0;
end else if ((s_ctrlport.req.addr >= BASE_ADDRESS) &&
(s_ctrlport.req.addr < BASE_ADDRESS + WINDOW_SIZE)) begin
s_ctrlport.resp.ack <= s_ctrlport.req.wr | s_ctrlport.req.rd;
end else begin
s_ctrlport.resp.ack <= 1'b0;
end
end
// other outputs are fixed
assign s_ctrlport.resp.status = STS_CMDERR;
assign s_ctrlport.resp.data = '0;
endmodule
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