User's Manual

Turbo PMAC2 VME Hardware Reference
Axis Piggyback Board Connector Descriptions 37
P2A (JMACHB) Alternate Machine Connector
The P2A connector provides an alternate path to J11 and J12 for the machine interface connections for
Channels 5-8. Only the positive signals of complementary pairs are brought out on this connector. For
the inputs, the complementary lines are tied to 2.5V on PMAC2. Refer to the J11 and J12 pin
descriptions for more detailed information on each pin.
P2A/JMACHB
(96-Pin Header)
Front View
Pin# Row A Row B
(Format A)
Row B
(Format B)
Row C
01 +5V No Connect CHU5 +5V
02 GND No Connect CHU7 GND
03 CHA5 No Connect CHV5 CHA7
04 CHB5 No Connect CHV7 CHB7
05 CHC5 No Connect CHW5 CHC7
06 PLIM5 No Connect CHW7 PLIM7
07 MLIM5 No Connect CHT5 MLIM7
08 HOME5 No Connect CHT7 HOME7
09 AENA5 No Connect USER5 AENA7
10 FAULT5 No Connect USER7 FAULT7
11 PWMATOP5/
DAC_CLK5
No Connect ADC_DAA5 PWMATOP7/ DAC_CLK7
12 PWMABOT5/ DAC5A No Connect ADC_DAA7 PWMABOT7/ DAC7A
13 PWMBTOP5/DAC_STB5 No Connect ADC_DAB5 PWMBTOP7/ DAC_STB7
14 PWMBBOT5/ DAC5B No Connect ADC_DAB7 PWMBBOT7/ DAC7B
15 PWMCTOP5/ DIR5 No Connect ADC_CLK5678 PWMCTOP7/ DIR7
16 PWMCBOT5/ PULSE5 No Connect ADC_STB5678 PWMCBOT7/ PULSE7
17 CHA6 No Connect SCLK5678 CHA8
18 CHB6 No Connect WD0/ CHB8
19 CHC6 No Connect CHU6 CHC8
20 PLIM6 No Connect CHU8 PLIM8
21 MLIM6 No Connect CHV6 MLIM8
22 HOME6 No Connect CHV8 HOME8
23 AENA6 No Connect CHW6 AENA8
24 FAULT6 No Connect CHW8 FAULT8
25 PWMATOP6/
DAC_CLK6
No Connect CHT6 PWMATOP8/DAC_CLK8
26 PWMABOT6/DAC6A No Connect CHT8 PWMABOT8/DAC8A
27 PWMBTOP6/DAC_STB6 No Connect USER6 PWMBTOP8/DAC_STB8
28 PWMBBOT6/DAC6B No Connect USER8 PWMBBOT8/DAC8B
29 PWMCTOP6/DIR6 No Connect ADC_DAA6 PWMCTOP8/ DIR8
30 PWMCBOT6/PULSE6 No Connect ADC_DAA8 PWMCBOT8/ PULSE8
31 GND No Connect ADC_DAB6 GND
32 +5V No Connect ADC_DAB8 +5V
Detailed pin descriptions for the pins on this connector are given on the J11 and J12 connectors. The P2A
connector is just an alternate path for these signals.
Note: Format A for the B-row will be used if jumpers JP1-1 to JP1-32 are removed. This format should be used
in a 32-bit VME system. Format B for the B-row will be used if these jumpers connect pins 1 and 2. This format
is not compatible with a 32-bit VME system.