KSZ8862 Micrel Semiconductor, KSZ8862 Datasheet - Page 58

• Manufacturer Part Number: KSZ8862
• Description: 2-port Ethernet Switch With Non-pci Interface And Fiber Support
• Manufacturer: Micrel Semiconductor

Bank 0 Bus Error Status Register (0x06): BESR
This register flags the different kinds of errors on the host bus.
Bank 0 Bus Burst Length Register (0x08): BBLR
Before the burst can be sent, the burst length needs to be programmed.
Bank 1 Reserved
Except Bank Select Register (0xE).
Bank 2 Host MAC Address Register Low (0x00): MARL
This register along with the other two Host MAC address registers are loaded starting at word location 0x1 of the
EEPROM upon hardware reset. The software driver can modify the register, 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 KSZ8862M 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
The following table shows the register bit fields:
Micrel, Inc.
April 2007
Bit
15
14-11
10
9-0
Bit
15
14-12
11-0
Default Value
0
-
0
0x000
Default Value
0
0x0
0x000
R/W
RO
RO
RO
RO
R/W
RO
RW
RO
Description
IBEC Illegal Byte Enable Combination
1: illegal byte enable combination occurs. The illegal combination value can be found from bit
14 to bit 11.
0: legal byte enable combination.
Write 1 to clear.
IBECV Illegal Byte Enable Combination Value
Bit 14: byte enable 3.
Bit 13: byte enable 2.
Bit 12: byte enable 1.
Bit 11: byte enable 0.
This value is valid only when bit 15 is set to 1.
SSAXFER Simultaneous Synchronous and Asnychronous Transfers
1: Synchronous and Asnychronous Transfers occur simultaneously.
0: normal.
Write 1 to clear.
Reserved
Description
Reserved
BRL Burst Length (for burst read and write)
000: single.
011: fixed burst read length of 4.
101: fixed burst read length of 8.
111: fixed burst read length of 16.
Reserved
58
KSZ8862-16/32MQL
M9999-040407-3.0