Backplane Information
This section contains bus signal charts and backplane layout illustrations.
VMEbus Backplane
Cardcage slot numbers are stamped, printed, or labeled on the
sheet metal near the card ejectors. VMEbus backplane jumpers
are silk-screened on the cardcage as Px00, Px01, Px02, Px03,
and Px04 or Jx00, Jx01, Jx02, Jx03, and Jx04; where x represents
the card slot number.
These jumpers control VMEbus signals BUS GRANT 0-3 IN
(BG0-3IN) to BUS GRANT 0-3 OUT (BG0-3 OUT), and
INTERRUPT ACKNOWLEDGE IN (IACKIN) to INTERRUPT
ACKNOWLEDGE OUT (IACKOUT). The VMEbus signals are
referred to as BG0, BG1, BG2, BG3, and IACK in this section.
VMEbus Signals
The VMEbus consists of signals on J1/P1 Row A, J1/P1 Row B,
J1/P1 Row C, and J2/P2 Row B.
P2 Bus Signals
The Sun P2 Bus consists of signals on J2/P2 Row A, J2/P2 Row C,
and J3/P3 Row B.
VMEbus J1/P1 Pinouts
VMEbus J2/P2 Pinouts
VMEbus J3/P3 Pinouts
Pressfit Backplanes
Pressfit Backplane production began in June 1987. Solderless
contacts are machine pressed into plated-through holes on printed
circuit boards. Component leads installed into the solderless
contacts are held in place by a tapered entry, multi-finger contact
design.
501-1439, 501-1598, and 501-1832 12-Slot Backplanes
The Sun P2 bus connects cardcage Slots 1 through 7 to each
other, and cardcage Slots 10, 11, and 12 to each other.
In addition to the Sun P2 bus and the VMEbus, the 12-slot
backplane has a private Internal bus that connects Slots 1, 2, and
3 as shown below.
J1/P1, Rows A, B, and C, on Slots 1, 2, and 3 are not
connected to the VMEbus. Boards that use the VMEbus
cannot be used in Slots 1, 2, or 3. J2/P2, Row B, is connected
between Slots 1 through 7.
The 501-1439 Backplane terminates J2/P2, Row C, Pins 75 and
96 with a 40.2W resistor and a 47pf capacitor.
The 501-1598 and 501-1832 Backplanes terminate J2/P2, Row
C, Pins 75 and 96 with a 200W resistor. Termination is jumper
selectable.
The Sun 4400 CPU is not supported in the 501-1439 Backplane.
The function of the backplane jumpers is shown below.
Backplane Sun P2 or Private Bus Connection
Backplane slots that share an adjacent P2 bus are marked with
the same letter in the charts below.
| 
Print-friendly Page