The additional signals provided to the PL (in addition to the standard AXI4 signals) are listed in Table: Additional Per Port HP I/O Signals. The QoS priority and FIFO occupancy management functions (read and write data and command buffer counts) are discussed in the following sections.
Table 35-3: Additional Per Port HP I/O Signals
|
Type
|
PS-PL Signal Name
|
I/O
|
Description
|
|
FIFO Occupancy
|
*_RCOUNT[7:0]
|
O
|
Fill level of read data channel FIFO.
|
|
*_WCOUNT[7:0]
|
O
|
Fill level of write data channel FIFO.
|
|
*_RACOUNT[3:0]
|
O
|
Fill level of read address channel FIFO.
|
|
*_WACOUNT[3:0]
|
O
|
Fill level of write address channel FIFO.
|
|
Quality of Service
|
*_AWQOS[3:0]
|
I
|
Write address channel QOS input. Qualified by corresponding *_AWVALID.
|
|
*_ARQOS[3:0]
|
I
|
Read address channel QOS input. Qualified by corresponding *_ARVALID.
|