Cyclone® V Hard Processor System Technical Reference Manual
9.3.2.2. FPGA-to-HPS Bridge Slave Signals
The following tables list all the signals exposed by the FPGA-to-HPS slave interface to the FPGA fabric.
| Signal | Width | Direction | Description | 
|---|---|---|---|
| AWID |   8 bits  |  
         Input  |  
         Write address ID  |  
      
| AWADDR |   32 bits  |  
         Input  |  
         Write address  |  
      
| AWLEN |   4 bits  |  
         Input  |  
         Burst length  |  
      
| AWSIZE |   3 bits  |  
         Input  |  
         Burst size  |  
      
| AWBURST |   2 bits  |  
         Input  |  
         Burst type  |  
      
| AWLOCK |   2 bits  |  
         Input  |  
         Lock type—Valid values are 00 (normal access) and 01 (exclusive access)  |  
      
| AWCACHE |   4 bits  |  
         Input  |  
         Cache policy type  |  
      
| AWPROT |   3 bits  |  
         Input  |  
         Protection type  |  
      
| AWVALID |   1 bit  |  
         Input  |  
         Write address channel valid  |  
      
| AWREADY |   1 bit  |  
         Output  |  
         Write address channel ready  |  
      
| AWUSER |   5 bits  |  
         Input  |  
         User sideband signals  |  
      
| Signal | Width | Direction | Description | 
|---|---|---|---|
| WID |   8 bits  |  
         Input  |  
         Write ID  |  
      
| WDATA |   32, 64, or 128 bits  |  
         Input  |  
         Write data  |  
      
| WSTRB |   4, 8, or 16 bits  |  
         Input  |  
         Write data strobes  |  
      
| WLAST |   1 bit  |  
         Input  |  
         Write last data identifier  |  
      
| WVALID |   1 bit  |  
         Input  |  
         Write data channel valid  |  
      
| WREADY |   1 bit  |  
         Output  |  
         Write data channel ready  |  
      
| Signal | Width | Direction | Description | 
|---|---|---|---|
| BID |   8 bits  |  
         Output  |  
         Write response ID  |  
      
| BRESP |   2 bits  |  
         Output  |  
         Write response  |  
      
| BVALID |   1 bit  |  
         Output  |  
         Write response channel valid  |  
      
| BREADY |   1 bit  |  
         Input  |  
         Write response channel ready  |  
      
| Signal | Width | Direction | Description | 
|---|---|---|---|
| ARID |   8 bits  |  
         Input  |  
         Read address ID  |  
      
| ARADDR |   32 bits  |  
         Input  |  
         Read address  |  
      
| ARLEN |   4 bits  |  
         Input  |  
         Burst length  |  
      
| ARSIZE |   3 bits  |  
         Input  |  
         Burst size  |  
      
| ARBURST |   2 bits  |  
         Input  |  
         Burst type  |  
      
| ARLOCK |   2 bits  |  
         Input  |  
         Lock type—Valid values are 00 (normal access) and 01 (exclusive access)  |  
      
| ARCACHE |   4 bits  |  
         Input  |  
         Cache policy type  |  
      
| ARPROT |   3 bits  |  
         Input  |  
         Protection type  |  
      
| ARVALID |   1 bit  |  
         Input  |  
         Read address channel valid  |  
      
| ARREADY |   1 bit  |  
         Output  |  
         Read address channel ready  |  
      
| ARUSER |   5 bits  |  
         Input  |  
         Read user sideband signals  |  
      
| Signal | Width | Direction | Description | 
|---|---|---|---|
| RID |   8 bits  |  
         Output  |  
         Read ID  |  
      
| RDATA |   32, 64, or 128 bits  |  
         Output  |  
         Read data  |  
      
| RRESP |   2 bits  |  
         Output  |  
         Read response  |  
      
| RLAST |   1 bit  |  
         Output  |  
         Read last data identifier  |  
      
| RVALID |   1 bit  |  
         Output  |  
         Read data channel valid  |  
      
| RREADY |   1 bit  |  
         Input  |  
         Read data channel ready  |