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Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name RX_EXT_ RX_TYPE_ RX_EHEC RX_THEC RX_TYPE RX_SPARE RX_DP_ RX_SP_
HDR_REM HDR_REM _CHECK_ _CHECK_ CHECK_ _CHECK CHECK_ CHECK_
_INH _INH INH INH INH _INH INH INH
R/W R/W R/W R/W R/W R/W R/W R/W R/W
Value 000000 00
reset
ADDR = 0x1CE: GFP Mode
Bit 7: RX_EXT_HDR_REM_INH is set for GFP null headers. When set, the GFP Payload begins right
after the tHEC field. When cleared, the four bytes after the tHEC are the Linear Extended Header.
Bit 6: RX_TYPE_HDR_REM_INH is set to inhibit the removal of the received Type Header for test
purposes. When set, this field is prepended to the MAC Payload. When cleared, this field is not
forwarded through the MII interface.
Bits 5: RX_EHEC_CHECK_INH is set to inhibit the checking of the received eHEC field.
Bits 4: RX_THEC_CHECK_INH is set to inhibit the checking of the received tHEC field.
Bits 3: RX_TYPE_CHECK_INH is set to inhibit the checking of the received Type field.
Bits 2: RX_SPARE_CHECK_INH is set to inhibit the checking of the received Spare field.
Bits 1: RX_DP_CHECK_INH is set to inhibit the checking of the received DP field.
Bits 0: RX_SP_CHECK_INH is set to inhibit the checking of the received SP field.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name RX_SPARE[7:0]
R/W R/W
Value 0x00
after
reset
ADDR = 0x1CF: Receive Spare Field Byte
Bits 7-0: RX_SPARE[7:0] specifies the expected Spare Field when in GFP mode. If
RX_SPARE_CHECK_INH is not set, frames with a non-matching Spare Field are discarded and the
Form/Dest Error counter is incremented.