Why am I unable to use the Byte Enables for a True Dual-Port M9K memory block configured in a 32x8 mixed data width mode?

Description

Byte Enables are not supported in this configuration due to the way that the memory gets implemented.

The widest port width supported in True Dual-Port Mode for a single M9K block is x18.  This means that a 32x8 bit memory actually gets implemented as two separate 16x4 bit M9K blocks.  Although in this scenario, each M9K block maintains it's 4:1 ratio, 4 bit wide byte enables are not supported.

Byte enables are only supported for True Dual-Port memory configurations when both the PortA and PortB data widths of the individual M9K memory blocks are multiples of 8 or 9 bits.

Resolution

N/A