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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.

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.

VMEbus J1/P1 Pinouts

PIN ROW A ROW B ROW C
1 D00 BBSY* D08
2 D01 BCLR* D09
3 D02 ACFAIL* D10
4 D03 BG0IN* D11
5 D04 BG0OUT* D12
6 D05 BG1IN* D13
7 D06 BG1OUT* D14
8 D07 BG2IN* D15
9 GND BG2OUT* GND
10 SYSCLK BG3IN* SYSFAIL*
11 GND BG3OUT* BERR*
12 DS1* BR0* SYSRESET*
13 DS0* BR1* LWORD*
14 WRITE* BR2* AM5
15 GND BR3* A23
16 DTACK* AM0 A22
17 GND AM1 A21
18 AS* AM2 A20
19 GND AM3 A19
20 IACK* GND A18
21 IACKIN SERCLK A17
22 IACKOUT* SERDAT A16
23 AM4 GND A15
24 A07 IRQ7* A14
25 A06 IRQ6* A13
26 A05 IRQ5* A12
27 A04 IRQ4* A11
28 A03 IRQ3* A10
29 A02 IRQ2* A09
30 A01 IRQ1* A08
31 -12V +5VSTDBY +12V
32 +5V +5V +5V

VMEbus J2/P2 Pinouts

PIN ROW A ROW B ROW C
1 User Defined +5 User Defined
2 User Defined GND User Defined
3 User Defined RESERVED User Defined
4 User Defined A24 User Defined
5 User Defined A25 User Defined
6 User Defined A26 User Defined
7 User Defined A27 User Defined
8 User Defined A28 User Defined
9 User Defined A29 User Defined
10 User Defined A30 User Defined
11 User Defined A31 User Defined
12 User Defined GND User Defined
13 User Defined +5 User Defined
14 User Defined D16 User Defined
15 User Defined D17 User Defined
16 User Defined D18 User Defined
17 User Defined D19 User Defined
18 User Defined D20 User Defined
19 User Defined D21 User Defined
20 User Defined D22 User Defined
21 User Defined D23 User Defined
22 User Defined GND User Defined
23 User Defined D24 User Defined
24 User Defined D25 User Defined
25 User Defined D26 User Defined
26 User Defined D27 User Defined
27 User Defined D28 User Defined
28 User Defined D29 User Defined
29 User Defined D30 User Defined
30 User Defined D31 User Defined
31 User Defined GND User Defined
32 User Defined +5V User Defined

VMEbus J3/P3 Pinouts

PIN ROW A ROW B ROW C
1 +5V User Defined GND
2 +5V User Defined GND
3 +5V User Defined GND
4 +5V User Defined GND
5 +5V User Defined GND
6 +5V User Defined GND
7 +5V User Defined GND
8 +5V User Defined GND
9 +5V User Defined GND
10 +5V User Defined GND
11 +5V User Defined GND
12 +5V User Defined GND
13 +5V User Defined GND
14 +5V User Defined GND
15 +5V User Defined GND
16 +5V User Defined GND
17 +5V User Defined GND
18 +5V User Defined GND
19 +5V User Defined GND
20 +5V User Defined GND
21 +5V User Defined GND
22 +5V User Defined GND
23 +5V User Defined GND
24 +5V User Defined GND
25 +5V User Defined GND
26 +12V User Defined +12V
27 +12V User Defined +12V
28 -12V User Defined -12V
29 -12V User Defined -12V
30 -5V User Defined -5V
31 -5V User Defined -5V
32 -5V User Defined -5V


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.

Cross Sectional View

Overhead View of Solderless Contact

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


Last updated: December 2, 1996
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