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Last updated: April 16, 1997


Backplane Information

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.

LABEL SIGNAL ABBREVIATION
Jxx0 Pxx0 BUS GRANT 0 BG0
Jxx1 Pxx1 BUS GRANT 0 B01
Jxx2 Pxx2 BUS GRANT 0 BG2
Jxx3 Pxx3 BUS GRANT 0 BG3
Jxx4 Pxx4 INTERRUPT
ACKNOWLEDGE
IACK

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.

501-1354 5-Slot Backplane

Memory 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.
J102 Row A Connects to J403 Row A and J503 Row A
J102 Row C Connects to J403 Row C and J503 Row C
J103 Row B Connects to J403 Row B and J503 Row B

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.
JUMPER CONNECTS
P2xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 2
P3xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 3
P4xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 4

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.
J101 Row A Connects to J201 Row A and J301 Row A
J101 Row B Connects to J201 Row B and J301 Row B
J101 Row C Connects to J201 Row C and J301 Row C
J102 Row B Connects to J202 Row B and J302 Row B

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.
JUMPER CONNECTS
J4xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 4
J5xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 5
J6xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 6
J7xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 7
J8xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 8
J9xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 9
J10xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 10
J11xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 11
J12xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 12

501-1498 and 501-1597 16-Slot Backplanes

The 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.
J101 Row A Connects to J201 Row A and J301 Row A
J101 Row B Connects to J201 Row B and J301 Row B
J101 Row C Connects to J201 Row C and J301 Row C
J102 Row B Connects to J202 Row B and J302 Row B

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.
JUMPER CONNECTS
J2xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 2
J3xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 3
J4xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 4
J5xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 5
J6xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 6
J7xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 7
J8xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 8
J9xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 9
J10xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 10
J11xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 11
J12xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 12
J13xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 13
J14xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 14
J15xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 15
J16xx BG0-3IN to BG0-3Out and IACKIN to IACKOUT on slot 16

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.

3-Slot VMEbus Backplane
501-1127

Slot 1 2 3
P2 Bus A A A

5-Slot VMEbus Backplane
501-1354

Slot 1 2 3 4 5 6 7
P2 Bus A B B C D A A

6-Slot VMEbus Backplane
501-1128

Slot 1 2 3 4 5 6
P2 Bus A A A A B B

12-Slot VMEbus Backplane
501-1092 and 501-1117

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

12-Slot VMEbus Backplane
501-1439, 501-1598, and 501-1832

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

16-Slot VMEbus Backplane
501-1498 and 501-1597

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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