When the 2-lane core is connected to a device that implements only 1 lane, the 2-lane core trains and operates as a 1-lane device using lane 0.
When the 4-lane core is connected to a device that implements 1 lane, the 4-lane core trains and operates as a 1-lane device using lane 0, as shown in the following figure. Similarly, if the 4-lane core is connected to a 2-lane device, the core trains and operates as a 2-lane device using lanes 0 and 1.
When the 8-lane core is connected to a device that only implements 4 lanes, it trains and operates as a 4-lane device using lanes 0-3. Additionally, if the connected device only implements 1 or 2 lanes, the 8-lane core trains and operates as a 1- or 2-lane device.
Figure 1. Scaling of 4-Lane Endpoint Block from 4-Lane to 1-Lane
Operation
