Example R21 Delay Calculation - 8.11 English

CPRI LogiCORE IP Product Guide (PG056)

Document ID
PG056
Release Date
2022-11-16
Version
8.11 English

An example of the delay calculation follows, given that:

Line Rate = 1,228.8 Mb/s

UI = 813.8 ps

Transceiver Latency = 150 UI

Datapath Latency = 100 UI

Slave CDC FIFO = 160 UI

Slave Barrel Shift = 16 UI

Slave Coarse Timer = 340 UI

Master CDC FIFO = 1,340 UI

Master Barrel Shift = 13 UI

Master Coarse Timer = 15,000 UI

Cable Delay = (15000 - (150 + 13 + 100 + 1340) - (340 + 150 + 16 + 100 + 160)) / 2

Cable Delay = 6,315.5 UI = 5,139.55 ns

Table 4-19: Line Speed To UI Conversion Factors

Line Speed (Mb/s)

1 UI (ps)

614.4

1,627.6

1,228.8

813.8

2,457.6

406.9

3,072.0

325.5

4,915.2

203.45

6,144.0

162.76

8,110.08

123.303

9,830.4

101.725

10,137.6

98.643

12,165.12

82.202

24,330.24

41.101