ksz8851-mql Micrel Semiconductor, ksz8851-mql Datasheet - Page 60

• Manufacturer Part Number: ksz8851-mql
• Description: Single-port Ethernet Mac Controller With 8/16-bit Or 32-bit Non-pci Interface
• Manufacturer: Micrel Semiconductor

TXQ Memory Information Register (0x78 – 0x79): TXMIR
This register indicates the amount of free memory available in the TXQ of the QMU module.
0x7A – 0x7B: Reserved
Receive Frame Header Status Register (0x7C – 0x7D): RXFHSR
This register indicates the received frame header status information, the received frames are reported in RXFCTR
register. This register contains the status information for the frame received and the CPU can read so many times same
as the frame count value in the RXFCTR.
February 2009
Micrel, Inc.
Bit
Bit
15-13
12-0
Bit
15
14
13
12
11
10
9-8
7
6
5
4
3
2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Default Value
Default Value
Default Value
R/W
R/W
RO
RO
R/W
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Description
When this bit is set, the KSZ8851M will drop the frame if the source address is same as
MAC address in MARL, MARM, MARH registers.
Description
Reserved.
TXMA Transmit Memory Available
The amount of memory available is represented in units of byte. The TXQ memory is
used for both frame payload, control word.
Note: Software must be written to ensure that there is enough memory for the next
transmit frame including control information before transmit data is written to the TXQ.
Description
RXFV Receive Frame Valid
When this bit is set, it indicates that the present frame in the receive packet memory is
valid. The status information currently in this location is also valid.
When clear, it indicates that there is either no pending receive frame or that the current
frame is still in the process of receiving.
Reserved
RXICMPFCS Receive ICMP Frame Checksum Status
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
60
KSZ8851-16/32 MQL/MQLI
M9999-021309-1.1