KSZ8851-16MLLU TR Micrel, KSZ8851-16MLLU TR Datasheet - Page 54

• Manufacturer Part Number: KSZ8851-16MLLU TR
• Description: Ethernet ICs Single-Port Ethernet Controller (Automotive Grade)
• Manufacturer: Micrel

Specifications of KSZ8851-16MLLU TR

• Rohs: yes
• Product: Ethernet Controllers
• Package / Case: LQFP-48
• Mounting Style: SMD/SMT

Receive Frame Header Byte Count Register (0x7E – 0x7F): RXFHBCR
This register indicates the received frame header byte count information, the received frames are reported in RXFCTR
register. This register contains the total number of bytes information for the frame received and the CPU can read so
many times same as the frame count value in the RXFCTR.
May 2012
Micrel, Inc.
Bit
12
11
10
9-8
7
6
5
4
3
2
1
0
Bit
15-12
11-0
Default Value
Default Value
-
-
-
-
-
-
-
-
-
-
-
-
-
-
R/W
R/W
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Description
When this bit is set, the KSZ8851 received ICMP frame checksum field is incorrect.
RXIPFCS Receive IP Frame Checksum Status
When this bit is set, the KSZ8851 received IP header checksum field is incorrect.
RXTCPFCS Receive TCP Frame Checksum Status
When this bit is set, the KSZ8851 received TCP frame checksum field is incorrect.
RXUDPFCS Receive UDP Frame Checksum Status
When this bit is set, the KSZ8851 received UDP frame checksum field is incorrect.
Reserved
RXBF Receive Broadcast Frame
When this bit is set, it indicates that this frame has a broadcast address.
RXMF Receive Multicast Frame
When this bit is set, it indicates that this frame has a multicast address (including the
broadcast address).
RXUF Receive Unicast Frame
When this bit is set, it indicates that this frame has a unicast address.
RXMR Receive MII Error
When set, it indicates that there is an MII symbol error on the received frame.
RXFT Receive Frame Type
When this bit is set, it indicates that the frame is an Ethernet-type frame (frame length is
greater than 1500 bytes). When clear, it indicates that the frame is an IEEE 802.3 frame.
This bit is not valid for runt frames.
RXFTL Receive Frame Too Long
When this bit is set, it indicates that the frame length exceeds the maximum size of 2000
bytes. Frames that are too long are passed to the host only if the pass bad frame bit is set.
Note: Frame too long is only a frame length indication and does not cause any frame
truncation.
RXRF Receive Runt Frame
When this bit is set, it indicates that a frame was damaged by a collision or had a
premature termination before the collision window passed.
Runt frames are passed to the host only if the pass bad frame bit is set.
RXCE Receive CRC Error
When this bit is set, it indicates that a CRC error has occurred on the current received
frame.
CRC error frames are passed to the host only if the pass bad frame bit is set.
Description
Reserved.
RXBC Receive Byte Count
This field indicates the present received frame byte size.
Note: Always read low byte first for 8-bit mode opearation.
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KSZ8851-16MLL/MLLI
M9999-050112-2.1