21150-AB Signal Pins - Intel Corporation

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21150-AB

Manufacturer Part Number
21150-AB
Description
Communications, Transparent PCI-to-PCI Bridge
Manufacturer
Intel Corporation
Datasheet

Specifications of 21150-AB

Case
QFP
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2.0
Preliminary
Table 2.
Table 3.
Note: The _l signal name suffix indicates that the signal is asserted when it is at a low voltage level and
Datasheet

Signal Pins

This chapter provides detailed descriptions of the 21150 signal pins, grouped by function.
Table 2
in each group.

Signal Pins

Table 3
Signal Types
corresponds to the # suffix in the PCI Local Bus Specification. If this suffix is not present, the
signal is asserted when it is at a high voltage level.
Primary PCI bus
interface signal pins
Secondary PCI bus
interface signal pins
Secondary PCI bus
arbiter signal pins
General-purpose I/O
interface signal pins
Clock signal pins
Reset signal pins
Miscellaneous signal
pins
JTAG signal pins
I
O
TS
STS
OD
Signal Type
Function
describes the signal pin functional groups, and the following sections describe the signals
defines the signal type abbreviations used in the signal tables:
All PCI pins required by the Revision 1.1 of the PCI-to-PCI Bridge
Architecture Specification .
All PCI pins required by the Revision 1.1 of the PCI-to-PCI Bridge
Architecture Specification .
Nine request/grant pairs of pins for the secondary PCI bus.
An arbiter enable control pin.
Four general-purpose pins.
Two clock inputs (one for each PCI interface).
Ten clock outputs (for nine external secondary PCI bus devices and also for
the 21150).
A primary interface reset input.
A secondary interface reset output.
An input-only pin used to disable secondary clock outputs.
Two input voltage signaling level pins.
Three pins controlling 66 MHz operation.
All JTAG pins required by IEEE standard 1149.1.
Standard input only.
Standard output only.
Tristate bidirectional.
Sustained tristate. Active low signal must be pulled high for one cycle when
deasserting.
Standard open drain.
Description
Description
21150
7

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