KSZ884x-PMQL Evaluation Board User’s Guide
Micrel, Inc.
May, 2006
Rev.
1.1
14/27
Bit 10: D2 Support
= 1
Bit 9: D1 Support
= 1
Bit 8-6: Reserved
= (don’t care)
Bit 5: DSI
= 1
Bit 4: Reserved
= (don’t care)
Bit 3: PME Clock
= 0
Bit 2-0: Version
= 3
We can program this Configparam word to 0XFFF3
4.6.3
EEPROM Format for KSZ8842-PMQL-Eval Board
An external serial EEPROM with a standard micro wire bus interface is used for non-volatile
storage of information such as the host MAC address, power management information and
Subsystem ID, etc. The KSZ8842-PMQL performs an automatic read from the external EEPROM
and places the data into certain host accessible registers after the system reset.
The EEPROM format is shown in Table 8.
Table 8: EEPROM Format and Content
WORD
15 8
7 0
0H Reserved
1H
Host MAC Address Byte 2
Host MAC Address Byte 1
2H
Host MAC Address Byte 4
Host MAC Address Byte 3
3H
Host MAC Address Byte 6
Host MAC Address Byte 5
4H Subsystem
ID
5H
Subsystem Vendor ID
6H Reserved
7H-3FH
Not used by KSZ88X2PMQL (available for user to use)
4.6.4
EEPROM Content for KSZ8842-PMQL-Eval Board
Those contents are for user to reference, user can change them based on real application.
MAC Address: (
From Byte 6 to Byte 1)
00-01-02-03-04-05
Subsystem:
AA55
Subsystem Vendor ID:
55AA
4.7 Clock
Scheme
The Ethernet chip reference clock is provided from the external 25 MHz crystal (Y1). The crystal
is connected to the X1 and X2 pins on the KSZ88XX-PMQL. This 25 MHz clock is specified as
+3.3V tolerant, +/- 50 ppm. If an oscillator is used, X1 connects to a 3.3V tolerant oscillator and
X2 has no connection.
