
The following table lists the best case latency for the most significant bit of a word for the RX deserializer
for the PMA Direct datapath. PMA Direct mode is supported for Arria V GT, ST, and GZ devices only.
Table 13-7: Latency for RX Deserialization in Arria V Devices
FPGA Fabric Interface Width Arria V Latency in UI
8 bits 19
10 bits 23
16 bits 35
20 bits 43
64 bits 99
80 bits 123
The following table lists the best- case latency for the LSB of the TX serializer for all supported interface
widths for the PMA Direct datapath.
Table 13-8: Latency for TX Serialization n Arria V Devices
FPGA Fabric Interface Width Arria V Latency in UI
8 bits 43
10 bits 53
16 bits 67
20 bits 83
64 bits 131
80 bits 163
The following table shows the bits used for all FPGA fabric to PMA interface widths. Regardless of the
FPGA Fabric Interface Width selected, all 80 bits are exposed for the TX and RX parallel data ports.
However, depending upon the interface width selected not all bits on the bus will be active. The following
table shows which bits are active for each FPGA Fabric Interface Width selection. For example, if your
interface is 16 bits, the active bits on the bus are [17:0] and [7:0] of the 80 bit bus. The non-active bits are
tied to ground.
Table 13-9: Active Bits for Each Fabric Interface Width
FPGA Fabric Interface Width Bus Bits Used
8 bits [7:0]
UG-01080
2015.01.19
RX PMA Parameters
13-9
Arria V Transceiver Native PHY IP Core
Altera Corporation
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