Part Number: AM3352
Hi everyone,
When the device receives USB data via CPPI DMA, the Packet Descriptor "Buffer 0 length" and "Packet length" are incorrect.
Specifically, the operation is as follows.
(1) When "Buffer 0 length" and "Packet length" of Packet Descriptor can be acquired correctly
"CPPI DMA Memory Regions" and "Linking RAM" are 16 Kbytes,
When HOST (PC) transmits data of 15 Kbytes + 1 Byte,
the received data size (“Buffer 0 length” and “Packet length”) is 15 Kbytes + 1 Byte (512 Bytes * 30 pieces + 1 Byte → 15.001 KB).
This received data size is correct.
(2) When "Buffer 0 length" and "Packet length" of Packet Descriptor can not be acquired correctly
"CPPI DMA Memory Regions" and "Linking RAM" are 16 Kbytes,
When HOST (PC) sends data of 16 Kbytes + 1 Byte,
the received data size ("Buffer 0 length" and "Packet length") is 16 Kbytes + 512 Bytes (512 Bytes * 33 pieces → 16.5 Kbytes).
This received data size is incorrect.
Please let me know why the received data will be 16.5KB if it exceeds 16KB.
Best regards,
Sasaki
