Achronix Speedster22i SerDes Manual do Utilizador Página 43

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Table 9: Latency across the PCS blocks” presents the latency experienced by datapath in
these two modes. The worst case latency is presented in in “Figure 20 Worst-case latency
across PMA and PCS
Table 9: Latency across the PCS blocks
# PCS Module Data Path
Latency experienced by datapath
PCS Enabled
PCS Bypassed
1.
Polarity bit reversal
symbol swap 0
Transmit 0 Not applicable
2.
8b/10b Encoder
Transmit
2
Not applicable
3.
Polarity bit reversal
symbol swap 1
Receive 0 Not applicable
4.
8b/10b Decoder
Receive
2
Not applicable
5.
Symbol Alignment
Module
Receive 2 Not applicable
6.
Deskew Module
Receive
FIFO_Threshold + 5
Not applicable
7. EFIFO Module Receive
FIFO threshold + 7 +
no_of_lanes_bonded/4*
Not applicable
8.
Other
2
Total Latency
13 (max)
2
* For special case of lane-bonding
UG028, July 1, 2014
43
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