User's Manual

PMAC2 PCI Hardware Reference Manual
36 Base Board Connector Pinouts
J12 JMACH4 Connector
(Continued)
Front View
Pin# Symbol Function Description Notes
90 PWMBTOP8-
DAC_STB8-
Output Phase B top Cmd. or DAC
strobe
Programmable function control
91 PWMBBOT8+
DAC8B+
Output Phase B bottom Cmd. or DAC
B serial data
Programmable function control
92 PWMBBOT8-
DAC8B-
Output Phase B bottom Cmd. or DAC
B serial data
Programmable function control
93 PWMCTOP8+
DIR8+
Output Phase B top Cmd. or PFM
direction
Programmable function control
94 PWMCTOP8-
DIR8-
Output Phase B top Cmd. or PFM
direction
Programmable function control
95 PWMCBOT8+
PULSE8+
Output Phase B bottom Cmd. or PFM
pulse
Programmable function control
96 PWMCBOT8-
PULSE8-
Output Phase B bottom Cmd. or PFM
pulse
Programmable function control
97 GND Common Reference voltage
98 GND Common Reference voltage
99 +5V Output / Input +5V power For external circuit or from external
supply
100 +5V Output / Input +5V power For external circuit or from external
supply
The JMACH4 connector provides the interface pins for channels 7 and 8. Usually, it is connected to a breakout
board, such as one of the Acc-8x family of boards, or an application-specific interface board.
TB1 (2/4-Pin Terminal Block)
This terminal block can be used to provide the input for the power supply for the circuits on the PMAC2
board when it is not in a bus configuration. When the PMAC2 is in a bus configuration, these supplies
come through the bus connector from the bus power supply automatically; in this case, this terminal block
should not be used.
Pin# Symbol Function Description Notes
1 GND Common Reference voltage
2 +5V Input Positive supply voltage Supplies all PMAC digital
circuits
3 +12V Input Positive supply voltage +12v to +15v; not required
on-board; used on J1 to
supply analog inputs
4 -12V Input Negative supply voltage -12v to -15v; required for opt-
12 ADCs; used on J1 to
supply analog inputs
Note: Unless Option 12 (Analog-to-Digital Converters) is included on the board, only pins 1 and 2 will be
provided on this terminal block.