IP100A LF
Preliminary Data Sheet
77/97
March. 30, 2007
Copyright © 2004, IC Plus Corp.
IP100A LF-DS-R17
11.6.4 CISPointer
Class............................. LAN PCI Configuration Registers, Configuration
Base Address ............... PCI device configuration header start
Address Offset.............. 0x28
Default Value ................ 0x00000802
Width ............................ 32 bits
CISPointer identifies the location of the Card Information Structure (CIS). CISPointer contains the offset
of CIS in memory space. CISPointer value is hardwired and can not be changed. Although the CIS is in
memory, it is physically located in the EEPROM. Because the EEPROM access is so slow, the PCI
target will issue a Retry for each new access.
BIT
BIT NAME
R/W
BIT DESCRIPTION
2..0
AddressSpace-
Indicator
R
Address Space Indicator. AddressSpaceIndicator specifies the
base
address
within
the
space
indicated.
The
AddressSpaceOffset is added to AddressSpaceIndicator to
identify the start of the CIS. The AddressSpaceIndicator value is
0x2, indicating the IP100A LF only supports CIS access in the
memory pointed to by the PCI Base Address Register 1.
27..3
AddressSpaceOffset R
Address Space Offset. AddressSpaceOffset is the offset from the
base address specified by the PCI Base Address Register 1. The
IP100A LF supports CIS in memory space.
31..28
ROMImageNumber R
ROM Image Number. ROMImageNumber is 0x0 indicating the
IP100A LF does not support CIS access in the expansion ROM.
11.6.5 ClassCode
Class............................. LAN PCI Configuration Registers, Configuration
Base Address ............... PCI device configuration header start
Address Offset.............. 0x09
Default .......................... 0x020000
Width ............................ 24 bits
BIT
BIT NAME
R/W
BIT DESCRIPTION
23..0
ClassCode
R
Class Code. ClassCode identifies the general function of the PCI
device. A value of 0x020000 indicates an Ethernet network
controller.
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