PCI Bridges - Products: 21152 Transparent PCI-to-PCI Bridge
21152 Transparent PCI-to-PCI Bridge
The 21152AB transparent PCI-to-PCI Bridges is Not Recommended for new designs. For
33 MHz applications use the S21152BB.
The 21152 is designed for compliance with
PCI Local Bus Specification,
Revision 2.2. The
21152 is pin-to-pin compatible with the 21052 bridge, which is designed for compliance with
PCI Local Bus Specification,
Revision 2.0.
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The 21152 provides full support for delayed transactions, which enables the buffering of
memory read, I/O, and configuration transactions. The 21152 has separate posted write, read
data, and delayed transaction queues with significantly more buffering capability than
first-generation bridges. In addition, the 21152 supports buffering of simultaneous multiple
posted write and delayed transactions in both directions. Among the features provided by the
21152 are: a programmable 2-level secondary bus arbiter, individual secondary clock software
control, and enhanced address decoding. The 21152 has sufficient clock and arbitration pins to
support four PCI bus master devices directly on its secondary interface.
The 21152 allows the two PCI buses to operate concurrently. This means that a master and a
target on the same PCI bus can communicate while the other PCI bus is busy. This traffic
isolation may increase system performance in applications such as multimedia.
Features
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Designed for compliance with
PCI Local Bus Specification,
Revision 2.2
Implements delayed transactions for all PCI configuration, I/O, and memory read
commands up to three transactions simultaneously in each direction
Allows 88 bytes of buffering (data and address) for posted memory write commands in
each direction up to five posted write transactions simultaneously in each direction
Allows 72 bytes of read data buffering in each direction
Provides concurrent primary and secondary bus operation to isolate traffic
Provides five secondary clock outputs:
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Low skew, permitting direct drive of option slots
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Individual clock control through configuration space
Provides arbitration support for four secondary bus devices:
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A programmable 2-level arbiter
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Hardware disable control, permitting use of an external arbiter
Provides enhanced address decoding:
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A 32-bit I/O address range
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A 32-bit memory-mapped I/O address range
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A 64-bit prefetchable memory address range
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ISA-aware mode for legacy support in the first 64 KB of I/O address range
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VGA addressing and VGA palette snooping support
Supports PCI transaction forwarding for the following commands:
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All I/O and memory commands
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Type 1 to Type 1 configuration commands
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Type 1 to Type 0 configuration commands (downstream only)
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All Type 1 to special cycle configuration command
Includes downstream lock support
PCI Bridges - Products: 21152 Transparent PCI-to-PCI Bridge
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Supports both 5 V and 3.3 V signaling environments
21152 Applications
The 21152 makes it possible to extend a system's load capability limit beyond that of a single
PCI bus by allowing motherboard designers to add more PCI devices, or more PCI option card
slots, than a single PCI bus can support. Figure 1 illustrates the use of two 21152 PCI-to-PCI
bridges on a system board. Each 21152 that is added to the board creates a new PCI bus that
provides support for the additional PCI slots or devices.
Figure 1. 21152 on the System Board
Option card designers can use the 21152 to implement multiple-device PCI option cards.
Without a PCI-to-PCI bridge, PCI loading rules would limit option cards to one device. The
PCI Local Bus Specification loading rules limit PCI option cards to a single connection per
PCI signal in the option card connector. However, the 21152 overcomes this restriction by
providing, on the option card, an independent PCI bus to which up to four devices can be
attached. Figure 2 shows how the 21152 enables the design of a multi-component option card.
Figure 2. 21152 with Option Cards
Figure 3. 21152 Characteristics Table
21152 Characteristics Table
Characteristic
Power Supply
Operating Temperature
Storage Temperature Range
Specification
VDD = 3.3 V
vdd_clamp = 5 V or 3.3 V
Tj Maximum = 125°C
55°C Minimum, 125°C Maximum
PCI Bridges - Products: 21152 Transparent PCI-to-PCI Bridge
Power Dissipation (Typical)
1.2 W Maximum
@ VDD = 3.3 V
with PCI Clock = 33 MHz
160-Pin PQFP
Package
Ordering Information
Product
PCI-to-PCI Bridge
To Order Now:
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Order Number
21152-AB
Contact an Intel authorized distributor
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Legal Information
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© 2002 Intel Corporation
Product Change Notification
# 1244-01
Information in this document is provided in connection with Intel® products. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Intel’s
Terms and Conditions of Sale for such products, Intel assumes no liability whatsoever, and Intel disclaims any express
or implied warranty, relating to sale and/or use of Intel® products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property
right. Intel® products are not intended for use in medical, life saving, or life sustaining applications. Intel may make
changes to specifications and product descriptions at any time, without notice.
Copyright
©
Intel Corporation 2001. Third-party brands and names are the property of their respective owners.
Intel, Insight960, Intel386, Intel486, Intel740, IntelDX2, IntelDX4, IntelSX2, Intel GigaBlade, Intel StrataFlash, Intel
Xeon, Intel XScale, Itanium, OverDrive, Pentium, Pentium II Xeon, Pentium
lll
Xeon, Solutions960, LANDesk,
Celeron, FlashFile, i386, i486, i960, iCAT, iCOMP, Intel SingleDriver technology, EtherExpress, AnyP oint is a
trademark or registered trademark of Intel Corporation or its subsidiaries in the United States and other countries.
Template Revision 16
August 2001
Page 1 of 3
Change Notification #:
Change Title:
Date of PCN Publication:
1244-01
21152AB PCI-to-PCI Bridge and 21A5203 Evaluation
Board, PCN 1244-01, Product Conversion
October 19, 2001
Type of Change Notification:
Form-Fit-Function
Key Characteristics of the Change:
Forecasted Key Milestones:
Date of Sample Availability
October 19, 2001
Date of Qualification Data Availability
October 19, 2001
Date Customer must be ready to receive post-conversion material
January 19, 2002
This is determined by the projected depletion of inventory at the time of the PCN publication. The
depletion of inventory may be impacted by fluctuating supply and demand, therefore, although customers
should be prepared to receive the post-converted materials on this date, Intel will continue to ship and
customers may continue to receive the pre-converted materials until the inventory has been depleted.
Date of first availability of post-conversion material
October 19, 2001
The date of “First Availability of post-conversion material” is the earliest date that customers may
request to receive post-conversion material.
Design, Order Code
Reason for Revision:
Revision #1 announces the conversion of the 21152AB to the S21152BB and the 21A5203 Evaluation Board to the 21A5205,
replacing the 21152AB product discontinuance.
Revision #0 announced the discontinuance of the 21152AB and the 21A5203 Evaluation board.
Description of Change to the Customer from Original PCN:
Intel will be converting the
21152AB PCI-to-PCI Bridge to the S21152BB. Intel will also be converting the 21A5203 Evaluation Board to 21A5205.
The S21152BB is backward compatible with the 21152AB and can be used in any 21152AB application. Order codes for
the new material are listed in the Component Products Table that follows. This product will be converted and unavailable for
additional orders after January 19, 2002. All outstanding orders for the 21152AB and 21A5203 will be converted to
S21152BB and 21A5205 at that time.
Revised Customer Impact of Change and Recommended Action:
Any customer using the
21152AB and/or 21A5203 Evaluation board in existing designs must convert to the S21152BB and/or 21A5205 by the
indicated milestones for this product. The product code will change from 21152AB to S21152BB and from 21A5203 to
21A5205. Orders for the 21152AB and 21A5203 will be converted to the S21152BB and 21A5205 upon depletion of the
current 21152AB and 21A5203 inventory.
The S21152BB design is pin-to-pin compatible with the 21152AB design. The S21152BB is an ASIC design using an Intel
0.35 micron CMOS process and its associated cell library. The S21152BB has a lead form profile change from the 21152AB
and errata fix. These and other differences between the S21152BB and the 21152AB are fully defined in the “21152AB and
Template Revision 16
August 2001
Page 2 of 3
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