Datasheet
Preliminary
CPC945 Bridge and Memory Controller
Table 4-5. Processor Interface 0 Signal Pins
I/O
Supply
Voltage
Signal
Levels
Signal Name
Signal Description
Signal Type
Input
PI input data from processor 0 or 1 on bus 0. ADO[0:44] repre-
sents the address, data, and control information which can be bal-
anced code encoded or 36-bit unencoded signal plus 8-bit parity
bits. When data is transmitted unencoded, AD[0:35] = data,
AD[36] = transfer handshake, and AD[37:43] = parity.
PI0_ADO[0:43]
1.3 V - 1.5 V
VDD2
PI0_SROP[0:1]
PI0_SRON[0:1]
Snoop coherency response from the processor 0 or 1 to CPC945
Complement signals to PI0_SROP[0:1]
Input
Input
1.3 V - 1.5 V
1.3 V - 1.5 V
VDD2
VDD2
BCLKI is the differential bus clock input from the transmitting
agent used to strobe incoming data by the receiver. PI0_BCLKOP
is the positive input from processor 0 or 1 to CPC945.
PI0_BCLKOP
PI0_BCLKON
Input
Input
1.3 V - 1.5 V
1.3 V - 1.5 V
VDD2
VDD2
Negative input of the differential bus clock PI0_BCLKP
PI output data to processors 0 or 1 on bus 0. ADI[0:44] represents
the address, data, and control information which can be balanced
code encoded or 36-bit unencoded signal plus 8-bit parity bits.
When data transmitted unencoded, ADI[0:35] = data,
PI0_ADI[0:43]
Output
1.3 V - 1.5 V
VDD2
ADI[36] = transfer handshake, and ADI[37:43] = parity.
The snoop response is the accumulated snoop coherency
response output from CPC945 to processors 0, 1.
PI0_SRIP[0:1]
PI0_SRIN[0:1]
Output
Output
1.3 V - 1.5 V
1.3 V - 1.5 V
VDD2
VDD2
Complementary signals to PI0_SRIP[0:1]
BCLKI is the differential bus clock from the transmitting agent
used to strobe incoming data by the receiver. PI_BCLKIP is the
positive output from CPC945 to processor bus 0.
PI0_BCLKIP
PI0_BCLKIN
Output
Output
1.3 V - 1.5 V
1.3 V - 1.5 V
VDD2
VDD2
The negative output of PI0_BCLKIP to processor bus 0 from
CPC945
Note: For the processor interface 0, the driver impedance is controllable to 20 Ω and 40 Ω. The receiver has a 90 Ω termination that
can be deactivated. See the CPC 945 Bridge and Memory Controller User Manual for more information.
A15-6009-03
December 18, 2007 - IBM Confidential
Dimensions and Pin Information
Page 39 of 69
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