Micrel, Inc.
KSZ8851-16MLLJ
March 2010
67
M9999-030210-1.0
Flow Control Low Watermark Register (0xB0 – 0xB1): FCLWR
This register is used to control the flow control for low watermark in QMU RX queue.
Bit
Default Value
R/W
Description
15-12
-
RW
Reserved
11-0
0x0500
RW
FCLWC Flow Control Low Watermark Configuration
These bits are used to define the QMU RX queue low watermark configuration. It is in
double words count and default is 5.12 KByte available buffer space out of 12 KByte.
Flow Control High Watermark Register (0xB2 – 0xB3): FCHWR
This register is used to control the flow control for high watermark in QMU RX queue.
Bit
Default Value
R/W
Description
15-12
-
RW
Reserved
11-0
0x0300
RW
FCHWC Flow Control High Watermark Configuration
These bits are used to define the QMU RX queue high watermark configuration. It is in
double words count and default is 3.072 K Byte available buffer space out of 12 KByte.
Flow Control Overrun Watermark Register (0xB4 – 0xB5): FCOWR
This register is used to control the flow control for overrun watermark in QMU RX queue
Bit
Default Value
R/W
Description
15-12
-
RW
Reserved
11-0
0x0040
RW
FCLWC Flow Control Overrun Watermark Configuration
These bits are used to define the QMU RX queue overrun watermark configuration. It is in
double words count and default is 256 Bytes available buffer space out of 12 Kbyte.
0xB6 – 0xBF: Reserved
Chip ID and Enable Register (0xC0 – 0xC1): CIDER
This register contains the chip ID and the chip enable bit.
Bit
Default
R/W
Description
15-8
0x88
RO
Family ID
Chip family ID
7-4
0x7
RO
Chip ID
0x7 is assigned to KSZ8851-16MLLJ
3-1
0x1
RO
Revision ID
0
0x0
RW
Reserved
0xC2 – 0xC5: Reserved
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