Details:

The AES Engine produces an additional dma request for data input at the end of GCM cipher mode of Encryption. This issue only applies to Encryption with AES-GCM mode and it does not apply to AES-GCM Decryption or any other block cipher modes (for example CBC).

The extra DMA request goes away (deasserts) by itself after few cycles without any data written to it.

Depending on how the DMA in the system is set up for AES-GCM mode , the extra DMA request at the end of a packet transfer may cause unintended data transfer on the next packet.

Workaround(s):

None