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Micrel, Inc.

KSZ8851-16MLLJ

March 2010

M9999-030210-1.0

Host MAC Address Registers: MARL, MARM and MARH

These Host MAC address registers are loaded starting at word location 0x1 of the EEPROM upon hardware reset. The

software driver can read or write these registers value, but it will not modify the original Host MAC address value in the

EEPROM. These six bytes of Host MAC address in external EEPROM are loaded to these three registers as mapping

below:

MARL[15:0] = EEPROM 0x1(MAC Byte 2 and 1)

MARM[15:0] = EEPROM 0x2(MAC Byte 4 and 3)

MARH[15:0] = EEPROM 0x3(MAC Byte 6 and 5)

The Host MAC address is used to define the individual destination address that the KSZ8851-16MLLJ responds to when

receiving frames. Network addresses are generally expressed in the form of 01:23:45:67:89:AB, where the bytes are

received from left to right, and the bits within each byte are received from right to left (LSB to MSB). For example, the

actual transmitted and received bits are on the order of 10000000 11000100 10100010 11100110 10010001 11010101.

These three registers value for Host MAC address 01:23:45:67:89:AB will be held as below:

MARL[15:0] = 0x89AB

MARM[15:0] = 0x4567

MARH[15:0] = 0x0123

Host MAC Address Register Low (0x10 – 0x11): MARL

The following table shows the register bit fields for Low word of Host MAC address.

Bit

Default Value

R/W

Description

15-0

MARL MAC Address Low

The least significant word of the MAC address.

Host MAC Address Register Middle (0x12 – 0x13): MARM

The following table shows the register bit fields for middle word of Host MAC address.

Bit

Default Value

R/W

Description

15-0

MARM MAC Address Middle

The middle word of the MAC address.

Host MAC Address Register High (0x14 – 0x15): MARH

The following table shows the register bit fields for high word of Host MAC address.

Bit

Default Value

R/W

Description

15-0

MARH MAC Address High

The Most significant word of the MAC address.

0x16 – 0x1F: Reserved

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