Datasheet
Preliminary
CPC945 Bridge and Memory Controller
About This Datasheet
This datasheet describes the CPC945 Bridge and Memory Controller, also called the CPC945. It provides a
general overview of the device, electrical and physical package information, signal descriptions, timing, and
®
power considerations. The device is the front-side bus controller companion chip to the PowerPC 970MP
RISC microprocessor (PowerPC 970MP). The CPC945 also supports the PowerPC 970FX microprocessor.
Who Should Read This Datasheet
System designers and system architects of PowerPC 970MP or PowerPC 970FX applications should use this
document to effectively incorporate the CPC945 into a design. Readers should be familiar with the PowerPC
™
Architecture and the general constraints and requirements of developing personal computers.
Related Publications
PowerPC Microprocessor Documentation
The latest version of this manual, errata, and other IBM documents referred to in this manual, including the
CPC945 Bridge and Memory Controller Initialization Considerations Application Note, can be found at
ibm.com/chips. Information about the PowerPC 970MP or PowerPC 970FX can be obtained from this
Web site or from your IBM representative.
Architecture and Specifications
• Double Data Rate 2 (DDR2) SDRAM Specification, JESD79-2a
www.jedec.org
• HyperTransport I/O Link Specification, revision 1.04
www.hypertransport.org
2
• I C-Bus Specification, version 2.1
www.nxp.com
• May, Cathy, et. al., eds. The PowerPC Architecture: A Specification for a New Family of RISC Processors,
Second Edition. San Francisco: Morgan-Kaufmann, 1994.
• PCI Express Base Specification, version 1.0a
www.pcisig.com
Conventions Used in This Datasheet
• Hexadecimal values are preceded by a lowercase x. For example: x‘0B00’.
• Binary values in text are either spelled out (zero and one) or appear in single quotation marks.
For example: ‘10101’.
• Differential pairs of signals are designated by P for the positive signal and N for the negative signal.
For example: DDR_CK_A_P and DDR_CK_A_N.
• Active-low (nondifferential) signals are designated by overbars. For example: AGP_TRDY.
A15-6009-03
December 18, 2007 - IBM Confidential
About This Datasheet
Page 11 of 69
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