Publication No. 597-0000000013-000 Rev. F
Unpacking and Installation 15
2.5.4
Baseboard-to-VME Backplane Connector
The RM921N base module interconnects with the VME backplane through the P1
and P2 connectors. P1 and P2 are standard DIN triple‐row, 96‐pin male connectors
.
Table 2-4 Board-to-VME Backplane Connector (P1) Pin Description
Pin No.
Name
Description
Comments
A9, A11, A15, A17,
A19
GND
Circuit ground
Connected to RM921N ground plane
A21-A22
IACKIN#,
IACKOUT#
Interrupt Acknowledge
IN & OUT
Signals are bypassed on RM921N
A32
+5V
+5V supply
Connected to 5V power plane
B4-B5
BG0IN#,
BG0OUT#
Bus grant IN & OUT
(level 0)
Signals are bypassed on RM921N
B6-B7
BG1IN#,
BG1OUT#
Bus grant IN & OUT
(level 1)
Signals are bypassed on RM921N
B8-B9
BG2IN#,
BG2OUT#
Bus grant IN & OUT
(level 2)
Signals are bypassed on RM921N
B10-B11
BG3IN#,
BG3OUT#
Bus grant IN & OUT
(level 3)
Signals are bypassed on RM921N
B20 and B23
GND
Circuit ground
B32
+5V
+5V supply
Connected to 5V power plane
C9
GND
Circuit ground
C32
+5V
+5V supply
Connected to 5V power plane
NOTE
The RM921N uses only +5V voltage from rows A, B and C. Pins not listed in the table are left open.
Table 2-5 Board-to-VME Backplane Connector (P2) Pin Description
Pin No.
Name Description
Comment
B1, B13, B32
+5V
+5V supply
Connected to 5V power plane
B2, B12, B22, B31 GND
Circuit ground Connected to RM921N ground plane
NOTE
The RM921N uses only +5V voltage from rows B. Pins not listed in the table are left open.