Rainbow Electronics W90N745CDG - Manual (Page 100)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 95 - Revision A2
If the O=2’b00 indicates the CPU is the owner of Rx descriptor. After the CPU completes processing
the frame, it modifies the ownership field to 2’b10 and releases the Rx descriptor to EMC RxDMA.
Rx Status [29:16]: Receive Status
This field keeps the status for frame reception. All status bits are updated by EMC. In the receive
status, bits 29 to 23 are undefined and reserved for the future.
RP [22]: Runt Packet
The RP indicates the frame stored in the data buffer pointed by Rx descriptor is a short frame (frame
length is less than 64 bytes).
1’b0: The frame is not a short frame.
1’b1: The frame is a short frame.
ALIE [21]: Alignment Error
The ALIE indicates the frame stored in the data buffer pointed by Rx descriptor is not a multiple of
byte.
1’b0: The frame is a multiple of byte.
1’b1: The frame is not a multiple of byte.
RXGD [20]: Frame Reception Complete
The RXGD indicates the frame reception has completed and stored in the data buffer pointed by Rx
descriptor.
1’b0: The frame reception not complete yet.
1’b1: The frame reception completed.
PTLE [19]: Packet Too Long
The PTLE indicates the frame stored in the data buffer pointed by Rx descriptor is a long frame (frame
length is greater than 1518 bytes).
1’b0: The frame is not a long frame.
1’b1: The frame is a long frame.
CRCE [17]: CRC Error
The CRCE indicates the frame stored in the data buffer pointed by Rx descriptor incurred CRC error.
1’b0: The frame doesn’t incur CRC error.
1’b1: The frame incurred CRC error.