3.8.2. Ping Pong PHY Architecture
The hard memory controller I/O bank of the primary interface is used for address and command and is always adjacent and above the hard memory controller bank of the secondary interface. All four lanes of the primary hard memory controller bank are used for address and command. The I/O bank containing the secondary hard memory controller must have at least one lane from the secondary interface.
The following example shows a 2x16 Ping Pong PHY bank-lane configuration. The upper bank (I/O bank N) is the address and command bank, which serves both the primary and secondary interfaces. The primary hard memory controller is linked to the secondary interface by the Ping Pong bus. The lower bank (I/O bank N-1) is the secondary interface bank, which carries the data buses for both primary and secondary interfaces. In the 2x16 case a total of four I/O banks are required for data, hence two banks in total are sufficient for the implementation.
The data for the primary interface is routed down to the top two lanes of the secondary I/O bank, and the data for the secondary interface is routed to the bottom two lanes of the secondary I/O bank.
A 2x32 interface can be implemented using three tiles, so long as the tile containing the secondary hard memory controller has at least one secondary data lane. The order of the lanes does not matter.
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