5.1.7 A_WMODE and B_WMODE

In Dual-Port write mode, each port has a feed-through write or read-before-write option. When A_WMODE or B_WMODE is equal to:

• Logic 00 = Simple Write. Read-data port holds the previous value.
• Logic 01 = Feed-through. Write-data appears on the corresponding read-data port. This setting is invalid when the width of at least one port is greater than 20 bits and the two-port mode is in effect.
• Logic 10 = Read-before-write. The previous content of the memory appears on the corresponding read-data port before it is overwritten. This setting is invalid when the width of at least one port is greater than 20 bits and the two-port mode is in effect.