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Adding readback indicator for AXI slave mux

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aolofsson 2014-11-06 12:14:49 -05:00
parent 26c5da0cbb
commit b997ddd691
1 changed files with 16 additions and 6 deletions
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22
embox/hdl/embox.v
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@ -36,7 +36,7 @@
module embox (/*AUTOARG*/
// Outputs
mi_data_out, embox_full, embox_empty,
mi_data_out, mi_data_sel, embox_full, embox_not_empty,
// Inputs
reset, clk, mi_access, mi_write, mi_addr, mi_data_in
);
@ -55,19 +55,20 @@ module embox (/*AUTOARG*/
input [19:0] mi_addr;
input [DW-1:0] mi_data_in;
output [DW-1:0] mi_data_out;
output mi_data_sel;
/*****************************/
/*MAILBOX OUTPUTS */
/*****************************/
output embox_full;
output embox_empty;
output embox_not_empty;
/*****************************/
/*REGISTERS */
/*****************************/
reg [DW-1:0] mi_data_out;
reg [DW-1:0] embox_data_reg;
reg mi_data_sel;
/*****************************/
/*WIRES */
/*****************************/
@ -93,6 +94,10 @@ module embox (/*AUTOARG*/
assign embox_w1_access = (mi_addr[19:0]==`E_REG_MBOX1); //upper 32 bit word
assign embox_status_access = (mi_addr[19:0]==`E_REG_MBSTATUS);//polling fifo status
assign embox_match = embox_w0_access |
embox_w1_access |
embox_status_access;
//write logic
assign embox_write = mi_access & mi_write;
assign embox_w0_write = embox_w0_access & embox_write;
@ -116,12 +121,17 @@ module embox (/*AUTOARG*/
/*****************************/
/*READ BACK DATA */
/*****************************/
assign embox_read_data[DW-1:0] = embox_status_read ? {{(DW-2){1'b0}},embox_full,~embox_empty} :
assign embox_not_empty = ~embox_empty;
assign embox_read_data[DW-1:0] = embox_status_read ? {{(DW-2){1'b0}},embox_full,embox_not_empty} :
embox_w0_read ? embox_fifo_data[DW-1:0] :
embox_fifo_data[2*DW-1:DW];
always @ (posedge clk)
if(embox_read)
mi_data_out[DW-1:0] <= embox_read_data[DW-1:0];
begin
mi_data_out[DW-1:0] <= embox_read_data[DW-1:0];
mi_data_sel <= embox_match;
end
/*****************************/
/*FIFO */
@ -139,7 +149,7 @@ module embox (/*AUTOARG*/
.wr_data ({mi_data_in[DW-1:0],embox_data_reg[DW-1:0]}),
.rd_read (embox_w1_read)
);
endmodule // embox