Data General NOVA 4/S Manual page 120

Data General Corporation (DGC) has prepared this manual for use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole or
in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith.
INTERCONNECTION WITH SYSTEM
The memory communicates with the rest of the system
via its A and B connectors to the backpanel. Tables 12.1
through 12.6 list each signal either generated or
received by a memory board together with the
backpanel location of the signal.
Signal Back- | Source | Destination | Description
BMEMCLK A43 CPU Memory, FPU 10 MHZ square
wave MEMIN
B1OCLK A35 Power CPU, Memory, | 10 MHZ square
Supply FPU wave
B20CLK A39 Power CPU, Memory | 20 MHZ square
Supply wave
* See Appendix D for a timing diagram of the system
clock signals.
Table 12.2
MEMORY CONTROL SIGNALS
Signal Back- ; Source | Destination | Description
Pin
INHSEL B83 CPU Memory Prevents
memory from
CPY-FPU data
transfer.
MEMD B96 MEMORY {Power Supply {DC power
failure on -5
MEMSORRY A51 MEMORY ! CPU Memory busy
MEMSTART A55 CPU Memory Memory
operation
MEMWAIT A32 - CPU Reserved for
MEMWRITE A5 CPU Memory Memory Write
operation
starting
108
Table 12.3
MEMORY PHYSICAL ADDRESS/WRITE DATA
Signal Back- | Source |Destination | Description
Pin
MEMINO B12 CPU Memory, FPU_ | Physical
FPU Memory address bit or
high-order data
bit
MEMIN1 B14 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMIN2 B16 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMIN3 B18 CPU Memory, FPU_ | Physical
FPU Memory address bit or
MEMIN4 B26 CPU |Memory, FPU } Physical
FPU Memory address bit or
data bit
MEMINS B24 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMING6 B22 CPU Memory, FPU_ | Physical
FPU Memory address bit or
MEMIN7 B20 CPU Memory, FPU_ | Physical
FPU Memory address bit or
MEMIN8 B28 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMINS B30 CPU Memory, FPU_ | Physical
FPU Memory address bit or
MEMIN 10 B32 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMIN11 B42 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMIN12 B47 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMIN13 B45 CPU Memory, FPU_ | Physical
FPU Memory address bit or
data bit
MEMIN 14 B44 CPU Memory, FPU_ | Physical
FPU Memory address bit or
MEMIN15 B43 CPU Memory, FPU_ | Low-order
FPU Memory physical
address bit or
low-order data
MEMIN 16 B10 CPU Memory Reserved for
future use
MEMIN17 BS CPU Memory Reserved for
future use
MEMIN18 B8 CPU Memory Reserved for
future use
MEMIN19 B7 CPU Memory High-order
physical