SMSC LAN9420, LAN9420i YES, YES, YES, READ, Note, Note, Note, WRITE, EEPROM, DEFAULT, RESERVED, RESERVED, RESERVED, RESERVED, SPACE OFFSET, CONFIGURABLE, CONFIGURATION

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Datasheet

Table 4.10 lists the standard PCI header registers that are supported. Registers whose initial values for Subsystem Vendor ID and Subsystem Device ID, are configured from the EEPROM are indicated by ‘YES’ in the “EPROM CONFIGURABLE” column.

Table 4.10 Standard PCI Header Registers Supported

CONFIGURATION			READ/		EEPROM
SPACE OFFSET		REGISTER NAME	WRITE	DEFAULT	CONFIGURABLE
00h	- 01h	Vendor ID	RO	1055h
02h	- 03h	Device ID	RO	E420h
04h	- 05h	Command	R/W	00h
06h	- 07h	Status	RO, R/WC	0410h
08h		Revision ID	RO	Note 4.7
09h	- 0Bh	Class Code	RO	020000h
0Ch		Cache Line Size	R/W	00h
0Dh		Latency Timer	R/W	00h
0Eh		Header Type	RO	00h
0F - 1Bh		RESERVED	RO
1Ch - 1Fh		BAR 3 (Note 4.8)	R/W	00000000h
		(For NP-Mem mapped 1Kbyte)		(FFFFFC00h)
20h	- 23h	BAR 4 (Note 4.8)	R/W	0000001h
		(For I/O mapped 256byte)		(FFFFFF01h)
24h	- 2Bh	RESERVED	RO
2Ch - 2Dh		Subsystem Vendor ID (SSVID)	RO	1055h	YES
		(Note 4.9)
2EH - 2Fh		Subsystem Device ID (SSID)	RO	9420h	YES
		(Note 4.9)
30h	- 33h	RESERVED	RO
34h		Capabilities Pointer	RO	78h
35h	- 3Bh	RESERVED	RO
3Ch		Interrupt Line	R/W	00h
3Dh		Interrupt Pin	RO	01h
3Eh		Min_Gnt	RO	02h
3Fh		Max_Lat	RO	04h

Note 4.7 Default value is dependent on device revision.

Note 4.8 BAR3’s read back value is FFFFFC00h after writing FFFFFFFFh. BAR4’s read back value is FFFFFF01h after writing FFFFFFFFh.

Note 4.9 The Subsystem Vendor ID and Subsystem Device ID can be configured by the serial EEPROM. if no EEPROM is connected to LAN9420/LAN9420i, then the default values in the table are used.

Revision 1.22 (09-25-08)	150	SMSC LAN9420/LAN9420i
	DATASHEET