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MISC-683639B0

December 1987

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Document:	Firefox Workstation Backplane
Order Number:	MISC-683639B0
Revision:	0
Pages:	22
Original Filename:

OCR Text

Firefox Workstation Backplane
Revision 3.0

Eugene Yu (DECWSE::YU)
Janice Ferguson (DECWSE::FERGUSON)

Workstation Systems Engineering
Digital Equipment Corporation
100 Hamilton Avenue
Palo Alto, CA 94301
415-853-6789

December 23, 1987

RESTRICTED DISTRIBUTION

Copyright 1986, 1987 by Digital Equipment Corporation
The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for
any errors that may occur in this document. This specification does not describe any program or product
which is currently available from Digital Equipment Corporation. Nor does Digital Equipment Corporation commit to implement this specification in any product or program. Digital Equipment Corporation
makes no commitment that this document accurately describes any product it might ever make.

Blank Page

Table of Contents

12. Firefox Backplane

12.1. Clock Circuit ..................................................................................................................

12.2. Physical Characteristics .................................................................................................

12.3. Backplane Segmentation ...............................................................................................

12.4. Signal Assignments ........................................................................................................

12.4.1. M-Bus Backplane Signal Assignments ............................................................
12.4.2. Q-Bus Backplane Signal Assignments .............................................................
12.4.3. Graphics VI-Bus Backplane Signal Assignments ............................................
12.4.4. Primary-Power-Supply Connector Signal Assignment ................................ ... .
12.4.5. Expansion-power-supply connector Signal Assignment ..................................
12.4.6. Fan Connector Signal Assignments ................................................................ ,,
12.4.7. External Connector Signal Assignments ..........................................................

4
9
11
14
15
15
16

iii

Blank Page

Revision History

Date
10 Dec 87

Content/Changes

Version
3.0
I

Add Power and Fan connector signal list;
change External connector pinout

26 May 87

2.1

Add module numbers, slot IDs, and physical characteristics;
change VI-bus pinout

01May87

2.0

L-series connector changes

07 Feb 87

1.0

First external release

Blank Page

12. Firefox Backplane
Prepared By: Eugene Yu, Janice Ferguson

The Firefox backplane module is an 11.9-inch x 16-inch assembly that uses press-pin connector blocks to
implement a 12-slot, quad-height backplane. The printed circuit board is a four-layer board: two signal
layers, one +5-volt power plane, and one ground plane. A 64-ohm, controlled-impedance circuit board is
used to enhance signal integrity on the high-speed Firefox backplane. A new etch is used to implement the
Firefox system M-bus and iocal subsystem interconnects for the Q-bus and graphics Vl-bus.
The part numbers for the backplane are as follow:
•

50-17254-01 (etch)

•

54-17255-01 (assembled module)

The Q-bus section of the backplane will support a maximum of TBD equivalent AC loads (the backplane
itself presents TBD AC loads) and TBD DC loads from all the Q-bus modules inserted in the backplane.
The backplane is bounded and cannot be expanded.
The mechanical placement is shown in Figure 12-1. Slot 1 is located on the right side of the backplane (Jl
and J2) and slot 12 on the left (J23 and J24).
The backplane has two power connectors; each is a dual, 28-pin (56 pins total), card-edge connector. The
~onnector near slot 1 (150) t::> called the Prima.c) Power Supply ~onnector and distributes -r-5 volts and -r-12.
volts to slots 1-6. The connector near slot 12 (J51) is called the Expansion connector and distributes +5
volts and +12 volts to slots 7-12. Ground is common throughout the backplane.
To minimize system clock skews, the M-bus clock circuit is implemented on the backplane module. The
logic for the clock circuit is located near the Primary Power Supply connector (JSO).

12.1. Clock Circuit
The TBD ns oscillator goes through a J-K circuit that performs a divide-by-6 function and outputs a TBD
ns clock. This clock is distributed through 74F244 drivers and routed (matched impedance) to each of the
M-bus slots (slots 3-9).
There are two jumpers in the circuit: W9, which is normally in place, and WlO, which is normally not
present. By changing this to W9 out and WlO in, an external clock can be injectedrat J25, a coaxial connector. This feature is for test purposes and will not be used in a customer environment

12.1. Firefox Backplane

December 23, 1987

Firefox System Specification 1

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUTION

H-3000

Figure 12·1:

Mechanical Connector Placement

12.2. Physical Characteristics
The backplane has the following physical characteristics:
•

11.9" x 16.0" x .125" in sire

•

4 layers (power and ground are inner layers)

•

Inner layers are 2-ounce copper

•

Outer layers are 1-ounce copper

•

Dielectric is 8 mil thick

•

Etch is 8/8 technology

•

64-ohm matched impedance (10 percent tolerance)

•

No buried signals

2 Firefox System Specification

December 23, 1987

Firefox Backplane 12.3.

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUTION

12.3. Backplane Segmentation
The backplane has two types of connectors: regular Q-bus connectors and L-series connectors. Slots 1-9
use the L-series connectors, an example of which appears in Figure 12-2.
Each of slots 1-9 has two L-series connectors, and each connector has 94 pins. The pins on the top connector (Jl, for example) are named Al-A94. The pins on the bottom connector (J2, for example) are named
Bl-B94. Each of slots 1-9 has 188 pins available for signals, power, and ground.

Pin~ I

Figure 12-2:

The L-serles connector has one set of two rows of 47 pins (a total of 94 pins)

Slots 10-12 use the Q-bus connectors, an example of which appears in Figure 12-3.
Each of slots 10-12 has two Q-bus connectors, and each connector has 72 pins. The pins on the top and
bottom connectors are named AA-AV and BA-BV. Note that each pin will occur twice in each slot. For
example, J23 pin AA and J24 pin AA are both in slot 12. To specify a particular pin, the connector must
also be named. Each of slots 10-12 has 144 pins available for signals, power, and ground.

Figure 12-3:

The Q-bus connector has two sets of two rows of 18 pins (a total of 72 pins)

12.3. Firefox Backplane

December 23, 1987

Firefox System Specification 3

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The busses for slots 1-9 are assigned as shown in Table 12-1.
Table 12-1:

Susses for Slots 1-9

Slot

Bosses on Pins Al-A94

Bosses on Pins Bl-B94

1
2
3
4
5
6
7
8
9

J1 VI-bus
J3 VI-bus
15 VI-bus
J7 (reseived)
19 (reseived)
Jl l (reserved)
113 (reserved)
115 (reserved)
117 Q-bus

J2 VI-bus
J4 VI-bus
16 M-bus
J8 M-bus
JlO M-bus
J12 M-bus
114 M-bus
116 M-bus
118 M-bus

On the reseived pins above, there are power and ground connections and a small number of signals (see
Tables 12-3 through 12-17 for more specific information concerning signal assignments).
The busses for slots 10-12 are assigned as shown in Table 12-2.
Table 12-2:

Susses for Slots 10-12

Slot

Bosses on Jl9, J21, J23

Q22-bus
Q22-bus
Q22-bus

11
12

Busses on J20, J22, J24
Q22-bus
Q22-bus
Q22-bus

Note that the Q22-bus is present only if the Q-bus adapter module is in slot 9. Six dual Q-bus modules can
be supported, but there may be mechanical restrictions.

12.4. Signal Assignments
The -12-volt signal, although implemented across the slots, is not connected to -12 volts of power on the
Firefox backplane because it is not supported by the Firefox power supply (H7868).
12.4.1. M-Bus Backplane Signal Assignments

The MID signals (MID2, MIDl, MIDO) are used to assign a module ID to the modules in the M-bus slots.
The module IDs are assigned to the slots as shown in Table 12-3. The LEGSS (Low-End Graphics Subsystem) base module will always be in the slot with module ID 7.

4 Firefox System Specification

December 23, 1987

Firefox Backplane 12.4.1.

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUfION

Table 12-3:

Slot
1
2
3
4
5
6
7
8
9
10
11
12

Module IDs

MID2, MIDI, MIDO
Not applicable
Not applicable
111 (7)
101 (5)
100 (4)
Oll (3)
010 (2)
001 (1)
000 (0)
Not applicable
Not applicable
Not applicable

12.4.1. Firefox Backplane

December 23, 1987

Firefox System Specification 5

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Tables 12-4 through 12-7 show the pin assignment for each of the M-bus signals on the backplane.
Table 12-4:

Pin
Bl
B3
BS
B7
B9
Bll
B13
B15
B17
B19
B21
B23
B25
B27
B29
B31
B33
B35
B37
B39
B41
B43
B45
B47
B49
B51
B53
B55
B57
B59
B61
B63
B65
B67
B69
B71
B73
B75
B77
B79
B81
B83
B85
B87
B89
B91
B93

M-Bus Backplane Signal Assignment for Slots 3-9 on Connector B

Signal

GND
MCLKA

GND
MCLKB

GND
+12V
MBRQL
MBRMOL
+5V
MBRM3L
MBRM5L
:MBRM6L

GND
MSTATl
MIRQlL
MIRQ2L

GND
MCMDO
MCMD2
MCMD3
+5V
MDPAR
IvfiDl
~2

GND
MDALOO
MDAL02
MDAL03

GND
MDAL06
MRESETL
MDAL08
+5V
MDALll
MDAL13
MDAL14

GND
MDAL17
MDAL19
MDAL20

GND
MDAL23
MDAL25
MDAL26
+5V
MDAL29
MDAL31

6 Firefox System Specification

Pin
B2
B4
B6
BS
BIO
B12
B14
B16
B18
B20
B22
B24
B26
B28
B30
B32
B34
B36
B38
B40
B42
B44
B46
B48
B50
B52
B54
B56
B58
B60
B62
B64
B66
B68
B70
B72
B74
B76
B78
B80
B82
B84
B86
B88
B90
B92
B94

Signal
BATTERY5V

GND
+5V

GND
+12V
+12V

GND
MBRMlL
MBRM2L
:MBRM4L

GND
MSPAR
MSTATO
MIRQOL
+5V
MIRQ3 L
MCPAR
MCMDl

GND
MRSVB40
MSLOT
~o

GND
MCLKI

GND
MDALOl
+5V
MDAL04
MDAL05
MDAL07

GND
MDAL09
MDALlO
MDAL12

GND
MDAL15
MDAL16
MDAL18
+5V
MDAL21
MDAL22
MDAL24

GND
MDAL27
MDAL28
MDAL30

GND

December 23, 1987

Firefox Backplane 12.4.1.

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUTION

Table 12-5:

Pin
Al
A3
AS
A7
A9
All
Al3
A15
A17
A19
A21
A23
A25
A27
A29
A31
A33
A35
A37
A39
A41
A43
A45
A47
A49
A51
A53
A55
A57
A59
A61
A63
A65
A67
A69
A71
A73
A75
A77
A79
A81
A83
A85
A87
A89
A91
A93

M-Bus Backplane Signal Assignments for Slots 4-8 on Connector A

Signal
GND
Not used
Not used
Not used
GND
Not used
Not used
Not used
+5V
Not used
Not used
Not used
GND
Not used
Not used
Not used
GND
Not used
Not used
Not used
+SV
Not used
Not used
Not used
GND
Not used
Not used
Not used
GND
Not used
Not used
Not used
+5V
Not used
Not used
Not used
GND
Not used
Not used
-12V
GND
MRSVA83
MDATINVL
:MBUSY L
+5V

BHALTL
BPOK

12.4.1. Firefox Backplane

Pin
A2
A4
A6
A8
AIO
A12
A14
A16
A18
A20
A22
A24
A26
A28
A30
A32
A34
A36
A38
A40

A42
A44
A46
A48
A50
A52
A54
A56
A58
A60
A62
A64
A66
A68
A70
A72
A74
A76
A78
A80
A82
A84
A86
A88
A90
A92
A94

Signal
Not used
Not used
+5V
Not used
Not used
Not used
GND
Not used
Not used
Not used
GND
Not used
Not used
Not used
+5V
Not used
Not used
Not used
GND
Not used
Not used
Not used
GND
Not used
Not used
Not used
+5V
Not used
Not used
Not used
GND
Not used
Not used
Not used
GND
Not used
Not used
Not used
+5V
-12V
MRUNL
MRSVA84
GND
MSHAREDL
MABORTL
BDCOK
GND

December 23, 1987

Firefox System Specification 7

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The following are open collector signals that have backplane termination:
MDATINVL
MBUSYL
MSHAREDL
MABORTL

MRESETL
MCLKI
MIRQ<3:0>L

The following signals have weak pull-ups:
MDAL<31:0>
MCMD<3:0>
MSTAT<l:O>
MBRQL

MBRM<6:0> L
MDPAR
MSPAR
MCPAR

The signals on the A block labeled MBRM<0:6> are the bus-request signals from the other slots.
Table 12-6 lists the connections for the MBRQ signal from each of the slots to the other six slots.
Table 12-6:

M-Bus MBRQ Connections per Slot

MBRQ

Slot9
M-busO

Slot8
M-bus 1

Slot7
M-bus 2

Slot6
M-bus3

SlotS
M-bus 4

Bl3
Bl5
MBRQO*
Bl5
Bl5
Bl5
Bl6
MBRQl**
Bl5
B13
Bl6
B16
MBRQ2
Bl6
Bl3
Bl8
B16
B18
MBRQ3
Bl8
Bl8
Bl8
B19
B13
MBRQ4
Bl9
Bl9
B13
Bl9
B19
MBRQS
B20
B20
B20
B20
B20
MBRQ6
B21
B21
B21
B21
B21
MBRQ7
B23
B23
B23
B23
B23
Note: In the Firefox backplane, M-bus 6 does not exist as a physical slot.

Slot4
M-busS

M-bus 6

Slot3
M-bus 7

Bl5
B16
Bl8
B19
B20
B13
B21
B23

Bl5
Bl6
Bl8
Bl9
B20
B21
B13
B23

Bl5
Bl6
Bl8
B19
B20
B21
B23
Bl3

* MBRQO is the MBRQ output from slot 0 (B 13 from slot 0).
** MBRQl is the MBRQ output from slot 1 (Bl3 from slot 1).
The information from the previous table is restated in Table 12-7.
Table 12-7:

MBRQ Wiring to MBRM per Slot

Slot

MBRMO
BlS

MBRMl
B16

MBRM2
B18

MBRM3
B19

MBRM4
B20

MB RMS
B21

MBRM6
B23

M-bus 0
M-bus 1
M-bus 2
M-bus 3
M-bus 4
M-bus 5
M-bus 7

MBRQl
MBRQO
MBRQO
MBRQO
MBRQO
MBRQO
MBRQO

MBRQ2
MBRQ2
MBRQl
MBRQl
MBRQl
MBRQl
MBRQl

MBRQ3
MBRQ3
MBRQ3
MBRQ2
MBRQ2
MBRQ2
MBRQ2

MBRQ4
MBRQ4
MBRQ4
MBRQ4
MBRQ3
MBRQ3
MBRQ3

MBRQ5
MBRQS
MBRQ5
MBRQS
MBRQS
MBRQ4
MBRQ4

MBRQ6
MBRQ6
MBRQ6
MBRQ6
MBRQ6
MBRQ6
MBRQS

MBRQ7
MBRQ7
MBRQ7
MBRQ7
MBRQ7
MBRQ7
MBRQ6

MCLKA and MCLKB are radially distributed to each slot from the M-bus clock subsystem. The M-bus
clock-generator components are located on the M-bus backplane.
Although the unspecified signals in the A connector block are reserved and must not be connected to any
internal logic of the M-bus modules, the modules must still connect to the assigned power pins because
they are part of the DC-power-distribution network.

8 Firefox System Specification

December 23, 1987

Firefox Backplane 12.4.l.

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The maximum stub length for the MCMD, MSTATUS, :MDAL, and l\1PARITY signals is 1.5 inches,
where stub length is the amount of etch between the top of the edge finger and the IC pin. Stub length of
all other M-bus signals should not exceed 3.0 inches.
12.4.2. Q-Bus Backplane Signal Assignments

When the Q-bus adapter module is installed, slots 10-12 function as Q-bus slots. The Q-bus slots are implemented as A/B, A/B (no CID interconnect). A Q-bus slot can hold one quad or two dual Q-bus modules.
Because the Q-bus DMA grant and interrupt-acknowledge signals are daisy-chained. there is an order in
which the Q-bus modules must be inserted to avoid the use of grant cards: the highest priority slots must be
filled before the lower.
Table 12-8:

Q-Bus Slot Order of Priority

Priority
Highest

Slot
10 (119)
11 (121)
12 (J23)
12 (J24)
11 (122)

Lowest

10 (J20)

Table 12-9:

Q..Bus Backplane Signal Assignments for Slots 10-12

Connector A
Column 1
Row Column2
BIRQ5
AA
+5V
BIRQ6
AB
Not used
BDAL16
AC
GND
BDAL17
AD
+12V
SSPAREl
AB
BDOUT
SSPARE2
AF
BRPLY
SSPARE3
AH
BDIN
GND
BSYNC
AJ
MSPAREA
BWTBT
AK
MSPAREA
BIRQ4
AL
GND
BIAKI
AM
BDMR
BIAKO
AN
BHALT
BBS7
AP
BREF
BDMGI
AR
Not used
AS
BDMGO
GND
BINIT
AT
PSPAREl
AU
BDALOO
Not used
BDALOl
AV

Connector B
Row Column2
Column 1
BDCOK
BA
+5V
BPOK
BB
Not used
BDAL18
BC
GND
BDAL19
BD
+12V
BDAL20
BE
BDAL02
BDAL21
BF
BDAL03
BH
SSPARE8
BDAL04
BJ
GND
BDAL05
BK
MSPAREB
BDAL06
BL
MSPAREB
BDAL07
BM
GND
BDAL08
BN
BS ACK
BDAL09
BP
BIRQ7
BDALlO
BEVENT
BR
BDALll
BS
BDAL12
Not used
BT
GND
BDAL13
PSPARE2
BU
BDAL14
BDAL15
+5V
BV

Note that the MSPARE, SSPARE, and PSPARE signals are not bussed from slot to slot.

12.4.2. Firefox Backplane

December 23, 1987

Firefox System Specification 9

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Table 12-10:

Pin
Al
A3
A5
A7
A9
All
Al3
A15
A17
A19
A21
A23
A25
A27
A29
A3i
A33
A35
A37
A39
A41
A43
A45
A47
A49
A51
A53

ASS
A57
A59
A61
A63
A65
A67
A69
A71
A73
A75
A77
A79
A81
A83
A85
A87
A89
A91
A93

Q-Bus Backplane Signal Assignments on for Slot 9 Connector A

Signal
GND
Not used
Not used
BDAL16
GND
Not used
Not used
BRPLY
+5V
Not used
Not used
BWTBT
GND
Not used
BD:MR
BBS?
GND
BINIT
BDALOl
Not used
+5V
BDAL19
BDAL02
BDAL21
GND
BDAL05
BDAL06
BDAL07
GND
BSACK
Not used
BIRQ7
+5V
BEVENT
Not used
BDAL12
GND
Not used
Not used
-12V
GND
:MRSVA83
MDATINVL
MBUSYL
+5V
BHALTL
BPOK

10 Firefox System Specification

Pin
A2
A4
A6
A8
AlO
A12
A14
A16
A18
A20
A22
A24
A26
A28
A30
A32
A34
A36
A38
A40
A42
A44
A46
A48
ASO
A52
A54
A56
A58
A60
A62
A64
A66
A68
A70
A72
A74
A76
A78
A80
A82
A84
A86
A88
A90
A92
A94

Signal
BIRQ5
BIRQ6
+5V
Not used
BDAL17
BDOUT
GND
Not used
BDIN
BSYNC
GND
Not used
BIRQ4
BIAKOl
+5V
BREF
BDMGOl
BDALOO
GND
Not used
BDAL18
BDAL20
GND
BDAL03
BDAL04
Not used
+5V
Not used
BDAL08
BDAL09
GND
Not used
BDALlO
BDALll
GND
BDAL13
BDAL14
BDAL15
+5V
-12V
:MRUNL
:MRSVA84
GND
MSHAREDL
MABORTL
BDCOK
GND

December 23, 1987

Firefox Backplane 12.4.3.

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12.4.3. Graphics VI-Bus Backplane Signal Assignments
Table 12-11:

VI-Bus Backplane Signal Assignments for Slot 3 on Connector A

Pin
Al
A3
A5
A7
A9
All
A13
Al5
A17
A19
A21
A23
A25
A27

Signal
GND
BUFVI30H
BUFVI28H
BUFVI27H
GND
BUFVI24H
BUFVI22H
BUFVI21 H
+5VA
BUFVI18 H
BUFVI16H
BUFVI15 H
GND
BUFVI12H

A29

BUFVIlO H

A31
A33
A35
A37
A39
A41
A43
A45
A47
A49
A51
A53
A55
A57
A59
A61
A63
A65
A67
A69
A71
A73
A75
A77
A79
A81
A83
A85
A87
A89
A91
A93

BUFVI09H

GND
BUFVI06 H
BUFVI04 H
BUFVI03H
+5VA
BUFVIOOH
BUFBM2L
BUFBMl L
GND
DATASL
GRSVA53 H
GRSVA55 H
GND
GRSVA59H
GRSVA61 H
GRSVA63 H
+SVA
GRSVA67 H
GRSVA69H
Not used
GND
GRSVA75 H
Not used
-12V
GND
MRSVA83 H
MDATINVL
l\.1BUSY L
+5VA
BHALTL
BPOKH

12.4.3. Firefox Backplane

Pin
A2
A4
A6
A8
AlO
A12
A14
A16
A18
A20
A22
A24
A26
A28
A30
A32
A.34
A36
A38
A40
A42
A44
A46
A48
A50
A52
A54
A56
A58
A60
A62
A64
A66
A68
A70
A72
A74
A76
A78
A80
A82
A84
A86
A88
A90
A92
A94

Signal
BUFVI31 H
BUFVI29H
+5VA
BUFVI26H
BUFVI25 H
BUFVI23 H
GND
BUFVI20H
BUFVI19H
BUFVI17 H
GND
BUFVI14H
BUFVI13 H
BUFVIll H
+5VA
BUFVI08 H
BUFVI07H
BUFVI05 H
GND
BUFVI02H
BUFVIOl H
BUFBM3L
GND
BUFBMOL
BUFWRL
BUFDS L
+5VA
GRSVA56H
GRSVA58 H
GRSVA60H
GND
INITL
GRSVA66H
GRSVA68H
GND
Not used
Not used
Not used
+5\TA
-12V
MRUNL
MRSVA84H
GND
MSHAREDL
MABORTL
BDCOKH
GND

December 23, 1987

Firefox System Specification 11

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUfION

Table 12-12:

Pin
Al
A3
AS
A7
A9
All
A13
A15
A17
A19
A21
A23
A25
A27
A29
A31
A33
A35
A37
A39
A41
A43
A4S
A47
A49
ASl
AS3
ASS
A57
A59
A61
A63
A65
A67
A69
A71
A73
A7S
A77
A79
A81
A83
ASS
A87
A89
A91
A93

VI-Bus Backplane Signal Assignments for Slots 1 and 2 on Connector A

Signal
GND
BUFVI30H
BUFVI28H
BUFVI27H
GND
BUFVI24H
BUFVI22H
BUFVI21 H
+5VA
BUFVI18 H
BUFVI16H
BUFVI15 H
GND
BUFVI12H
BUFVIlOH
BUFVI09H
GND
BUFVI06H
BUFVI04H
BUFVI03 H
+SVA
BUFVIOOH
BUFBM2L
BUFBMlL
GND
DATASL
GRSVA53 H
GRSVASS H
GND
GRSVA59H
GRSVA61 H
GRSVA63 H
+SVA
GRSVA67 H
GRSVA69H
.MX23B3 H
GND
GRSVA7S H
NIBCLKH
-12V
GND
.MX22B2H
CMPSH
CMP4H
+SVA
CMPlH
BPOKH

12 Firefox System Specification

Pin
A2
A4
A6
A8
AlO
A12
A14
A16
A18
A20
A22
A24
A26
A28
A30
A32
A34
A36
A38
A40
A42
A44
A46
A48
A50
A52
A54
AS6
A58
A60
A62
A64
A66
A68
A70
A72
A74
A76
A78
A80
A82
A84
A86
A88
A90
A92
A94

Signal
BUFVl31 H
BUFVI29H
+5VA
BUFVI26H
BUFVI25 H
BUFVI23 H
GND
BUFVI20H
BUFVl19H
BUFVI17 H
GND
BUFVI14H
BUFVI13 H
BUFVIll H
+5VA
BUFVI08H
BUFVI07H
BUFVIOSH
GND
BUFVI02H
BUFVIOl H
BUFBM3L
GND
BUFBMOL
BUFWRL
BUFDSL
+SVA
GRSVA56H
GRSVA58 H
GRSVA60H
GND
INITL
GRSVA66H
GRSVA68H
GND
.MX23B2H
.MX23Bl H
.MX23BOH
+SVA
-12V
.MX22B3 H
.MX22Bl H
GND
CMP3H
CMP2H
CMPOH
GND

December 23, 1987

Firefox Backplane 12.4.3.

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUTION

Table 12-13:

Pin
Bl
B3
BS
B7
B9
B11
B13
B15
B17
B19
B21
B23
B25
B27
B29
B31
B33
B35
B37
B39
B41
B43
B45
B47
B49
B51
B53
B55
B57
B59
B61
B63
B65
B67
B69
B71
B73
B75
B77
B79
B81
B83
B85
B87
B89
B91
B93

VI-Bus Backplane Signal Assignment for Slots 1 and 2 on Connector B

Signal

GND
MX22BOH

GND
MX21B3 H

GND
+12VA
MX21B2H
MX21Bl H
+5VA
MX20B2H
MX20BOH
.MX19B3 H

GND
.MX19BOH
MX18B2H
MX18Bl H

GND
MX17B2H
.MX17BO H
~16B3H

+5VA
MX16Bl H
:MIDl
:MID2

GND
.MX15B3 H
MX15Bl H
MX15BOH

GND
MX14Bl H

GND
.MX13B3 H
+SVA
:MX13BOH
:MX12B2 H
:MX12Bl H

GND
:MX11B2H
MXllBOH
:MX10B3 H

GND
:MXlOBO H
:MX09B2 H
:MX09Bl H
+5VA
:MX08B2 H
:MX08BO H

12.4.4. Firefox Backplane

Pin
B2
B4
B6
B8
BlO
B12
B14
B16
B18
B20
B22
B24
B26
B28
B30
B32
B34
B36
B38
B40
B42
B44
B46
B48
BSO
B52
B54
B56
B58
B60
B62
B64
B66
B68
B70
B72
B74
B76
B78
B80
B82
B84
B86
B88
B90
B92
B94

Signal
not used

GND
+5VA

GND
+12VA
+12VA

GND
MX21BOH
MX20B3H
MX20Bl H

GND
.MX19B2 H
MX19Bl H
MX18B3 H
+5VA
MX18BOH
MX17B3 H
MX17Bl H

GND
MX16B2H
VISLOTH
MIDO

GND
MX16BOH

GND
MX15B2H
+5VA
MX14B3 H
MX14B2H
MX14BOH

GND
MX13B2H
MX13Bl H
MX12B3 H

GND
MX12BOH
MX11B3 H
MXllBl H
+5VA
MX10B2H
MXlOBI H
MX09B3 H

GND
MX09BOH
.MX08B3 H
MX08Bl H

GND

December 23, 1987

Firefox System Specification 13

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBlITION

12.4.4. Primary-Power-Supply Connector Signal Assignment

The primary-power-supply connector (150) located near slot 1 distributes +5 volts, + 12 volts, and power to
the fans. Power connector signal assignments on connector 150 appear in Table 12-14.
Table 12-14:

Pin
1
3
5
7
9
11
13
15
17
19
21

23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55

Power Connector Signal Assignment on Connector JSO

Signal

FANAPLUS
FANBPLUS
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
GND

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
+12VA
+12VA
+12VA

BEVENTL

14 Firefox System Specification

Pin
2
4
6
8
10
12
14
16
18
20
22

Signal

FANAMINUS
FANB:MINUS
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA

GND

26
28
30
32
34
36
38
40
42

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND

46
48
50
52
54
56

+12VA
+12VA

BDCOK
BPOK

December 23, 1987

Firefox Backplane 12.4.5.

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUTION

12.4.5. Expansion-power-supply connector Signal Assignment

The Expansion-power-supply connector (J51) located near slot 12 distributes +5 volts and +12 volts to slots
7-12.
Table 12-15:

Pin
1
3

5
7
9
11
13
15
17
19
21
2~

25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55

Power Connector Slgnal Assignment on Connector J51

Signal
Not used
Not used
+SVB
+5VB
+5VB
+5VB
+5VB
+SVB
+5VB
+5VB
+SVB
GND
GND
GND

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
+12VB
+12VB
+12VB
+12VB

2
4
6
8
10
12
14
16
18
20
22
24

26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56

Signal
Not used
Not used
+5VB
+5VB
+5VB
+SVB
+5VB
+SVB
+5VB
+SVB
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
+12VB
+12VB

BDCOK
BPOK

12.4.6. Fan Connector Slgnal Assignments

The primary-power-supply distributes power to fans A and B through the Fan connector J52 located near
slot 1.
Table 12-16:

Pin
1
2
3
4
5

Fan ConnectorJ52 Slgnal Assignment

Signal
FANAPLUS
No signal (used for keying)
FANAMINUS
FANBPLUS
FANBMINUS

12.4.7. Firefox Backplane

December 23, 1987

Firefox System Specification 15

DIGITAL EQUIPMENT CORPORATION - RESTRICTED DISTRIBUTION

12.4.7. External Connector Signal Assignments

The External Connector (J53) sends signals to the RF distribution panel. J53 signal assignments appear in
Table 12-17.
Table 12-17:

Pin
1
3
5
7
9

External Connector Signal Assignments on Connector J53

Signal
+5VA
BHALTL
GND
BPOK
BDCOK

16 Firefox System Specification

Pin
2
4
6
8
10

Signal
+5VA
GND
GND
Not used
MRUNL

December 23, 1987

Firefox Backplane 12.4.7.