axi_dmac: dest_axi_mm: Simplify dependency management

There is an implicit dependency between the outgoing data stream and the
incoming response stream. The AXI specification requires that the
corresponding response is not sent before the last beat of data has been
received.

We can take advantage of this and remove the currently explicit dependency
between the data and response paths. This slightly simplifies the design.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

library/axi_dmac/dest_axi_mm.v

@@ -100,7 +100,6 @@ wire data_req_valid;
 wire data_req_ready;
 
 wire address_enabled;
-wire data_enabled;
 
 splitter #(
   .NUM_M(2)
@@ -161,8 +160,9 @@ dmac_data_mover # (
   .clk(m_axi_aclk),
   .resetn(m_axi_aresetn),
 
-  .enable(address_enabled),
-  .enabled(data_enabled),
+  /* Unused. AXI protocol guarantees ordering */
+  .enable(1'b1),
+  .enabled(),
 
   .xfer_req(),
 
@@ -194,11 +194,11 @@ dmac_response_handler #(
   .bready(m_axi_bready),
   .bresp(m_axi_bresp),
 
-  .enable(data_enabled),
+  .enable(address_enabled),
   .enabled(enabled),
 
   .id(response_id),
-  .request_id(data_id),
+  .request_id(address_id),
 
   .eot(response_eot),