21150 PCI-to-PCI Bridge
Preliminary Datasheet
Pr oduc t Featur es
1.
For 21150-AB and later revisions only. The 21150-AA does not implement this feature.
■
Complies fully with the PCI Local Bus
Specification, Revisi on 2.1
■ Complies fully with the Advanced
Configuration Power Interface (ACPI)
Specification
■ Complies fully with the PCI Power
Management Specification, Revision 1.0
1
■ Complies fully with Revision 1.0 of the
PCI-to-PCI Bridge Architecture
Specification
■ Implements delayed t ransa ctions fo r al l PCI
configurat ion, I/O, a nd memory read
co mm ands—up to three tran sactions
simultaneo u sly in each dir ection
■ Allows 88 bytes of buffering (data and
address ) for posted memory write
comman ds i n each direction—up to five
posted write transactions simultaneously in
each direction
■ Allows 72 bytes of read data buf fering in
each direction
■ Provi des concurr ent pri mary and s econd ary
bus ope ration, to isol ate tra ffic
■ Provides 10 secondary clock outputs with
th e f ollowing features:
—Low skew permits direct drive of option
slots
—Individual clock disables, capable of
automati c configuration during reset
■ Provides arbitration support for nine
secondary bus d evices:
— A programmable 2-leve l arbiter
— Hardware disable control, to pe rmi t use
of an external arbiter
■ Provides a 4-pin general-purpos e I/O
interfa ce , accessible through dev ice-
spe cific configuration space
■ Provides enhanc ed a ddress decoding:
—A 32-bit I/O address ra nge
— A 32-bit memo ry-m apped I/O address
r ange
— A 64-bit prefetchable memory address
range
— ISA-aware mode for legacy support in
the first 64KB of I/O address range
— VGA address ing an d VGA palette
snooping support
■ Includes live inserti on support
■ Supports PCI tra nsaction fo rward ing for the
following commands:
— All I/O and memory commands
— Type 1 to Type 1 configuration
commands
— Type 1 to Type 0 configuration
com mands (downstrea m onl y)
— Al l Ty p e 1 to sp ecia l cy cle
configuration commands
■ I ncludes downstrea m lock suppor t
■ Su pports bot h 5-V and 3.3-V signaling
environments
■ Available in both 33 MHz and 66 MHz
versions
■ Prov i d es an IE EE st and ar d 1149. 1 JTA G
inter f a ce.
Order Number: 278106-002
J uly 1998
Notic e: This docume nt contai ns preliminar y inf ormation on new product s in production. The
specifi cati ons are subject to change without notice. Verify wit h your local Intel sal es office that
you have the lat est datasheet before fin ali zing a design.
