cp2200 Silicon Laboratories, cp2200 Datasheet - Page 83

• Manufacturer Part Number: cp2200
• Description: Single-chip Ethernet Controller
• Manufacturer: Silicon Laboratories

Bit 3:
Bit 2:
Bit 1:
Bit 0:
PADMD1[7] PADMD0[6] PADEN[5] CRCEN[4]
PHEADER: Proprietary Header Select Bit
0: No proprietary header exists on the front of IEEE 802.3 frames.
1: Four bytes of proprietary header information exist on the front of IEEE 802.3 frames. These bytes
will be ignored by the CRC function.
Reserved. Read = 0b; Must write 0b.
LENCHK: Frame Length Checking Enable Bit
0: Frame length checking is disabled.
1: Transmit and receive frame lengths are compared to the Length/Type field. If the Length/Type
field represents a length then the check is performed. Mismatches are reported in the Transmit/
Receive status vectors.
FLLDPLX: Full-Duplex Mode Enable Bit
0: MAC operates in half-duplex mode.
1: MAC operates in full-duplex mode.
Indirect Register 2. MACCF: MAC Configuration Register (Continued)
x
x
0
x
1
x
x
0
1
0
0
0
1
1
1
Table 21. Pad Operation
0
1
1
1
1
Rev. 1.0
No padding added on transmitted packets,
check CRC
No padding added on transmitted packets,
append CRC
Pad short frames to 60 bytes, append CRC
Pad short frames to 64 bytes, append CRC
Auto Detect Tagged VLAN Frames
(IEEE802.1q)
If untagged: Pad to 60 bytes, append CRC
If tagged: Pad to 64 bytes, append CRC
Action
CP2200/1
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