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IBM25CPC945CQ3C-2 参数 Datasheet PDF下载

IBM25CPC945CQ3C-2图片预览
型号: IBM25CPC945CQ3C-2
PDF下载: 下载PDF文件 查看货源
内容描述: [Micro Peripheral IC, CMOS, PBGA1182,]
分类和应用:
文件页数/大小: 69 页 / 1861 K
品牌: IBM [ IBM ]
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Datasheet  
Preliminary  
CPC945 Bridge and Memory Controller  
3.6 Processor Interface Specifications  
The CPC945’s dual PowerPC 970xx processor interfaces operate at up to 625 MHz in double-data rate  
mode, providing up to 1250 million transfers per second. For the CPC945 to comply with the timing require-  
ments of the IBM PowerPC 970MP microprocessor, its internal configuration registers must be initialized at  
startup. The settings for these registers must be determined by analysis using the card design electrical char-  
acteristics, and optimized experimentally. The open-eye requirement for the CPC945 on the receiving end is  
the same as for the IBM PowerPC 970MP microprocessor. The processor link design must be appropriate for  
the required bit rate. The operating frequencies for the processor interfaces are generated by the PLL1 from  
the PI_APCLK differential signal pair.  
The processor interfaces feature an automatic initialization alignment procedure (IAP) that adjusts the timing  
skews on all the data lines at the receiving end of the interface. Board wiring flight-time information must be  
used to ensure that the maximum data skew figures listed in the IBM PowerPC 970MP RISC Microprocessor  
Datasheet are met. Additional requirements for board wiring are contained in that document.  
3.7 PCI Express Interface Specification  
The PCI Express interface operates at 2.5 GHz and complies with the electrical and timing requirements in  
the PCI-SIG, “PCI Express Base Specification Revision 1.0a,” PCI Express, April 15, 2003.  
The PCI-SIG, “PCI Express Card Electromechanical Specification Revision 1.0a,PCI Express, April 15,  
2003., should be used to correctly design this interface.  
2
3.8 I C Interface Specifications  
2
2
The I C slave interface complies with the I C-bus specification for standard-mode operation (100 kbps) and  
2
fast-mode operation (400 kbps). The I C master interfaces support standard-mode and operate at selectable  
bit rates of 25, 50, and 100 kbps.  
2
Table 3-10. I C-Bus Specifications  
Standard Mode  
Fast Mode  
Minimum  
Parameter  
Symbol  
Units  
Minimum  
Maximum  
100  
Maximum  
400  
SCL clock frequency  
(slave)  
fSCL  
fSCL  
0
0
0
kHz  
kHz  
SCL clock frequency  
(master)  
100  
N/A  
N/A  
Data set-up time  
Data hold time  
tSU  
tHO  
tCLH  
tCLL  
250  
02  
70  
1001  
02  
150  
ns  
ns  
μs  
μs  
SCL clock high time  
SCL clock low time  
4.0  
4.7  
0.6  
1.3  
1. A fast-mode I2C-bus device can be used in a standard-mode I2C-bus system, but the requirement tSU:DAT 250 ns must then be  
met. This is automatically the case if the device does not stretch the low period of the serial clock (SCL) signal. If such a device  
does stretch the low period of the SCL signal, it must send the next data bit to the serial data (SDA) line, tr max + tSU:DAT = 1000 +  
250 = 1250 ns (according to the standard-mode I2C-bus specification), before the SCL line is released.  
2. A device must internally provide a data hold time to bridge the undefined period between VIH and VIL of the falling edge of the  
SCLH signal. An input circuit with a threshold as low as possible for the falling edge of the SCLH signal minimizes this hold time.  
A15-6009-03  
December 18, 2007 - IBM Confidential  
Electrical and Thermal Characteristics  
Page 29 of 69  
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