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8.1.9
P2—System Expansion Connector
0
P2 is a 128-pin, 90
, DIN 41612 connector that provides a minimal system I/F required to
interface various types of communication transceivers. This connector contains 16-bit
(lower PPC bus) address lines, 16-bit (higher PPC bus) data lines, plus useful GPCM and
UPM control lines. The pinout of P2 is shown in Table 8-8.
Pin No.
Signal Name
A1
EXPA16
A2
EXPA17
A3
EXPA18
A4
EXPA19
A5
EXPA20
A6
EXPA21
A7
EXPA22
A8
EXPA23
A9
EXPA24
A10
EXPA25
A11
EXPA26
A12
EXPA27
A13
EXPA28
A14
EXPA29
A15
EXPA30
A16
EXPA31
A17
EXP12V
A18
A19
N.C.
A20
EXP3.3V
A21
A22
A23
A24
A25
N.C.
—
Table 8-8. P2
System Expansion Connector
Attribute
O
Expansion Address (16
the PowerQUICC II's PPC Address lines (16:31), provided for
external tool connection. To avoid reflection these lines are series
terminated with 43 Ω resistors.
O
These can be connected to the positive 12-V source from the PCI
edge connector thru J3. This line is fused by a 0.5A ressetable
poly-switch.
-
Not Connected.
O
3.3V Power Out. These lines are connected to the main 3.3V plane
of the PowerQUICC IIPCIAI-ADS, this, to provide 3.3V power
where necessary for external tool connected.
-
Not connected.
Chapter 8. Support
Interconnect Signals
Description
1
:31). This is a Latched-Buffered version of
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