SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The software can use the CRC replacement feature to instruct the MAC to replace the FCS field in the transmit frame with the CRC computed by the MAC. This feature works on a per-frame basis. The CRC replacement control field in the Transmit Descriptor Word 0 (TDES0) can be programmed to enable this for a frame. This feature is valid only when the Disable CRC control (Bit 27 of TDES0) is enabled. If SA or VLAN insertion control is enabled, the MAC appends or replaces the FCS field with the computed CRC when Disable CRC Control is enabled or disabled, respectively.
Bit 27 (DC) | Bit 24 (CRCR) | Description |
---|---|---|
0 | X | Append CRC
When DC = 0, the MAC appends the computed CRC irrespective of the CRCR setting. |
1 | 1 | Replace CRC |
1 | 0 | No operation (user has appended CRC) |