82801CA Datasheet, PDF (249/521 Pages) Intel Corporation – I/O Controller Hub 3-S (ICH3-S)

LAN Controller Registers (B1:D8:F0)
7.2.3
7.2.4
System Control Block General Pointer Register
Offset Address: 04–07h
Default Value: 0000 0000h
Attribute:
Size:
R/W
32 bits
Bit
Description
15:0
SCB General Pointer. The SCB General Pointer register is programmed by software to point to
various data structures in main memory depending on the current SCB Command word.
PORT
Offset Address: 08–0Bh
Default Value: 0000 0000h
Attribute:
Size:
R/W (special)
32 bits
The PORT interface allows the processor to reset the ICH3’s internal LAN Controller, or perform
an internal self test. The PORT DWord may be written as a 32-bit entity, two 16-bit entities, or four
8-bit entities. The LAN Controller will only accept the command after the high byte (offset 0Bh) is
written, therefore the high byte must be written last.
Bit
Description
Pointer Field. A 16-byte aligned address must be written to this field when issuing a Self-Test
31:4 command to the PORT interface.The results of the Self Test will be written to the address specified
by this field.
PORT Function Selection. Valid values are listed below. All other values are Reserved.
0000 = PORT Software Reset: Completely resets the LAN Controller (all CSR and PCI registers).
This command should not be used when the device is active. If a PORT Software Reset is
desired, software should do a Selective Reset (described below), wait for the PORT register
to be cleared (completion of the Selective Reset), and then issue the PORT Software Reset
command. Software should wait approximately 10µs after issuing this command before
attempting to access the LAN Controller’s registers again.
0001 = Self Test: The Self-Test begins by issuing an internal Selective Reset followed by a general
3:0
internal self-test of the LAN Controller. The results of the self-test are written to memory at the
address specified in the Pointer field of this register. The format of the self-test result is shown
in Table 7-5. After completing the self-test and writing the results to memory, the LAN
Controller will execute a full internal reset and will re-initialize to the default configuration.
Self-Test does not generate an interrupt of similar indicator to the host processor upon
completion.
0010 = Selective Reset: Sets the CU and RU to the Idle state, but otherwise maintains the current
configuration parameters (RU and CU Base, HDSSize, Error Counters, Configure information
and Individual/Multicast Addresses are preserved). Software should wait approximately 10µs
after issuing this command before attempting to access the LAN Controller’s registers again.
Intel^® 82801CA ICH3-S Datasheet
249