82443ZX Datasheet, PDF (103/116 Pages) Intel Corporation – Intel® 440ZX AGPset: Host Bridge/Controller

Functional Description
4.8.2 82443ZX Reset
The 82443ZX reset function is an integral part of the suspend resume functions. The 82443ZX
supports the normal reset function in a desktop platform, as well as the various power-up reset and
resume reset functions in the mobile platform. In this section, the power-up reset is described. The
resume from suspend sequences are described in the following section.
Table 4-15. AGPset Reset
Pentium^® II Processor
A20M#, IGNNE#,
INTR, NMI
CPURST#
CRESET#
INIT#
NBX#
4x
2to1 Mux
External CPU
Clock Ratio
Straps
External CPU Strap Glue
SUB_STAT1#
PCIRST#
PIIX4E#
RSTDRV
PWROK
:
Table 4-16. Reset Signals
Signal
PCIRST#
CPURST#
RSTDRV
INIT#
Asserted System Devices or
with PCIRST# Buses Affected
-
PCI bus, 82443ZX
NB, PIIX4E
Always
CPU
Always
No
ISA bus / X-Bus
devices
CPU
Signal
Source
Description
PIIX4E
PCIRST# is used in power -up
sequence as well as resume from STR
or STD.
82443ZX
CPU reset signal. CPURST# pin resides
in 82443ZX.
PIIX4E
ISA bus reset. Directly derived from
PCIRST#. Resides in PIIX4E main
voltage well.
PIIX4E CPU Soft Reset generated by PIIX4E.
82443ZX Host Bridge Datasheet
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