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Ethernet Control and Status registers
352
NS9750 Hardware Reference
D08 R/W PUREP 0 Pure preamble enforcement
0 No preamble checking is performed
1 The MAC certifies the content of the preamble to
ensure that it contains
0x55 and is error-free.
D07 R/W AUTOP 0 Auto detect pad enable
When set to 1, this bit causes the MAC to detect
automatically the type of transmit frame, either tagged or
untagged, by comparing the two octets following the
source address with the
0x8100 VLAN protect ID and pad
accordingly.
Note: This bit is ignored if PADEN is set
to 0.
See "PAD operation table for transmit frames" on page
353 for more information.
D06 R/W VLANP 0 VLAN pad enable
Set to 1 to have the MAC pad all short transmit frames to
64 bytes and to append a valid CRC. This bit is used in
conjunction with auto detect pad enable (AUTOP) and
pad/CRC enable (PADEN). See "PAD operation table for
transmit frames" on page 353.
Note: This bit is ignored if PADEN is set
to 0.
D05 R/W PADEN 0 Pad/CRC enable
0 Short transmit frames not padded.
1 The MAC pads all short transmit frames.
This bit is used in conjunction with auto detect pad enable
(AUTOP) and VLAN pad enable (VLANP). See "PAD
operation table for transmit frames" on page 353.
D04 R/W CRCEN 0 CRC enable
0 Transmit frames presented to the MAC contain a
CRC.
1 Append a CRC to every transmit frame, whether
padding is required or not.
CRCEN must be set if PADEN is set to 1.
D03 R/W Not used 0 Always write as 0.
Bits Access Mnemonic Reset Definition
Table 212: MAC Configuration Register #2