Visible to Intel only — GUID: lsa1486507326951
Ixiasoft
Visible to Intel only — GUID: lsa1486507326951
Ixiasoft
3.9.4. Skew Calculations
To calculate the maximum skew between the channels, the following parameters are used:
- PMA to PCS datapath interface width (S)
- Maximum difference in number of parallel clock cycles between deassertion of each channel's FIFO reset (N)
To calculate the channel skew, the following scenarios are considered:
- Non-bonded
In this case, both the PMA and PCS are non-bonded. Skew ranges from 0 UI to [(S-1) + N*S] UI.
- PMA bonding using x6 / xN clock network
In this case, the PCS is non-bonded. Skew ranges from [0 to (N*S)] UI + x6/xN clock skew.
- PMA bonding using the PLL feedback compensation clock network
In this case, the PCS is non-bonded. Skew ranges from [0 to (N*S)] UI + (reference clock skew) + (x6 clock skew).
- PMA and PCS bonding using the x6 / xN clock network
Skew = x6 / xN clock skew.
- PMA and PCS bonding using PLL feedback compensation clock network
Skew = (reference clock skew) + (x6 clock skew).