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EFE configuration
182
NS7520 Hardware Reference, Rev. D 03/2006
D07 R/W AUTOP 0 Auto detect pad enable
When set to 1, the MAC automatically detects the
frame type — tagged or untagged — by comparing
the two octets following the source address with
’h8100 VLAN protocol ID and pad accordingly. See
Table 62: "PAD operation" on page 183 for
additional information.
Note: This bit is ignored if PADEN (D05) is set
to 0.
D06 R/W VLANP 0 VLAN pad enable
When set to 1, the MAC pads all short frames to
64 bytes and appends a valid CRC.
See Table 62: "PAD operation" on page 183 for
additional information.
Note: This bit is ignored if PADEN (D05) is set
to 0.
D05 R/W PADEN 0 PAD/CRC enable
1 The MAC pads all short frames.
0 Frames presented to the MAC have a valid
length.
PADEN is used in conjunction with the Auto detect
pad enable and VLAN pad enable fields.
See Table 62: "PAD operation" on page 183 for
additional information.
D04 R/W CRCEN 0 CRC enable
1 Appends a CRC to every frame whether or not
padding is required. This bit must be set to 1 if
PAD/CRC is enabled.
0 Indicates that frames presented to the MAC
already contain a CRC.
D03 R/W DELCRC 0 Delayed CRC
Determines the number of bytes, if any, of
proprietary header information that exist in the
front of the IEEE 802.3 frames.
1 Four bytes of proprietary header information
(ignored by the CRC calculation function).
0 Zero bytes of proprietary header information.
Bits Access Mnemonic Reset Description
Table 61: MAC Configuration Register 2 bit definition