If the Length/Type field has a length interpretation, the received frame can be padded to meet the minimum frame size specification. If FCS Pass Through is disabled (RCW1 register bit 29 Table 1) and Length/Type filed error checking is enabled (RCW1 register bit 25 Table 1), the padding is stripped along with the FCS field and is not passed to you. If FCS Pass Through is disabled (RCW1 register bit 29 Table 1) and Length/Type field error checking is also disabled, the padding is not stripped and is passed to you but the FCS field is stripped and is not passed to you.
If the FCS Pass Through is enabled, any padding is passed to you along with the FCS field. Even though the FCS is passed up to you, it is also verified and the frame is dropped if the FCS is incorrect. A Receive Reject interrupt is activated (see bit 3 in ).
| FCS Pass Through (RCW1 register bit 29 = 1) | FCS Strip (RCW1 register bit 29 = 0) | |
|---|---|---|
|
Length/Type field error check (RCW1 register bit 25 = 0) |
FCS and padding (if present) fields passed to user for all accepted frames | FCS and padding (if present) fields stripped and not passed to user for all accepted frames |
|
Length/Type field error ignore (RCW1 register bit 25 = 1) |
FCS and padding (if present) fields passed to user for all accepted frames | FCS field stripped and not passed to user but padding (if present) passed to user for all accepted frames |