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Backplane InformationVMEbus BackplaneCardcage 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 SignalsThe VMEbus consists of signals on J1/P1 Row A, J1/P1 Row B, J1/P1 Row C, and J2/P2 Row B. P2 Bus SignalsThe Sun P2 Bus consists of signals on J2/P2 Row A, J2/P2 Row C, and J3/P3 Row B. 501-1354 5-Slot BackplaneMemory board options plug into connector J3, Slots 4 and 5, on the 501-1354 backplane. The Sun P2 bus connects Slots 1, 4, and 5 as shown below.
Cardcage Slots 4 and 5 share a private bus that connects signals between J2/P2, Row A and J2/P2, Row C. These slots are used with 6U VMEbus boards. The function of the backplane jumpers is shown below.
501-1439, 501-1598, and 501-1832 12-Slot BackplanesThe 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 40.2 Ohm resistor and a 47pf capacitor. The 501-1598 and 501-1832 Backplanes terminate J2/P2, Row C, Pins 75 and 96 with a 200 Ohm 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.
501-1498 and 501-1597 16-Slot BackplanesThe Sun P2 bus connects cardcage Slots 1 through 7 to each other, cardcage Slots 11 and 12 to each other, and cardcage Slots 13, 14, and 15 to each other. In addition to the Sun P2 bus and the VMEbus, the 16-slot backplane private internal bus 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 501-1498 Backplane must be 501-1498-02 or greater when used with the Sun 4400 CPU. The function of the backplane jumpers is shown below.
Backplane Sun P2 or Private Bus ConnectionBackplane slots that share an adjacent P2 bus are marked with the same letter in the charts below. 3-Slot VMEbus Backplane
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| Slot | 1 | 2 | 3 |
|---|---|---|---|
| P2 Bus | A | A | A |
| Slot | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| P2 Bus | A | B | B | C | D | A | A |
| Slot | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| P2 Bus | A | A | A | A | B | B |
| Slot | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P2 Bus | A | A | A | A | A | A | B | C | D | E | E | E |
| Slot | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P2 Bus | A | A | A | A | A | A | A | B | C | D | D | D |
| Slot | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P2 Bus | A | A | A | A | A | A | A | B | C | D | E | E | F | F | F | G |
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