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Note 28.0 MSV11-Q/M/J Memory Comparisons No replies
FURILO::GIORGETTI 175 lines 21-AUG-1985 23:07
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| d i g i t a l | | uNOTE # 028 |
+---------------+ +-----------------+
+----------------------------------------------------+-----------------+
| Title: MSV11-Q/M/J MEMORY COMPARISONS | Date: 28-JUN-85 |
+----------------------------------------------------+-----------------+
| Originator: JACK TOTO | Page 1 of 3 |
+----------------------------------------------------+-----------------+
This MicroNote will compare three of Digital Equipment Corporation's
newest memory modules. Following the description of each memory module,
is a chart which, list the differences between these memories.
MSV11-Q
-------
The MSV11-Q has three versions, the MSV11-QA, the MSV11-QB and the
MSV11-QC. The MSV11-QA (M7551-A) is a quad size Q-bus memory module and
contains 1MB of MOS RAM using 64K bit parts. The MSV11-QA has two etch
revisions which must be checked when configuring the module into a
system. The two revisions are the C rev and the A rev, both of these
revisions are discussed in the Users Guide (EK-MSV1Q-UG) and in
Micronote # 030. The second version of the MSV11-Q is the MSV11-QB
(M7551-B) which is a half populated quad size Q-bus memory module
containing 2MB of MOS RAM using 256K bit parts. The last version of the
MSV11-Q is the MSV11-QC which is a fully populated MSV11-QB quad size
Q-bus memory module containing 4MB of MOS RAM using 256K bit parts.
Both the MSV11-QB and the MSV11-QC use the MSV11-QA printed circuit
board, however that board is ECOed to etch level C.
MSV11-J
-------
The MSV11-J has four versions, the MSV11-JB and MSV11-JC which are used
in the PDP-11/84 UNIBUS systems and the MSV11-JD and MSV11-JE are used
in either the MicroPDP-11/83 Q-bus systems, or the PDP-11/84 UNIBUS
systems. All four modules use ECC memory for error correction, as well
as using 256K bit MOS RAM parts on either a half or fully populated quad
size module.
NOTE:
-----
NONE OF THE FOUR MSV11-J MODULES CAN BE PLACED IN A Q/Q
BACKPLANE SLOT. IF THIS IS ATTEMPTED PERMANENT DAMAGE WILL
BE DONE TO THE BOARDS AND TO THE SYSTEM.
The MSV11-JB (M8637-BA) is a half populated quad size PMI memory module
containing 1MB of memory. The second version of the MSV11-J is the
MSV11-JC (M8639-CA), this is a fully populated MSV11-JB quad size PMI
memory module containing 2MB of memory. These two modules can not be
used in a Q-bus system due to gate array incompatibilities, and can only
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Page 2 of 3
be used in PDP-11/84 systems which use the UNIBUS/PMI bus interface
(KTJ11-A). The third version of the MSV11-J is the MSV11-JD (M8639-DA)
which is a half populated quad size PMI memory module containing 1MB of
memory. The last version of the MSV11-J is the MSV11-JE, (M8639-EA)
which is a fully populated MSV11-JD quad size PMI memory module
containing 2MB of memory. These last two modules can be used with
either the MicroPDP-11/83 system which uses the Q-bus/PMI bus interface
or the PDP-11/84 system which was mentioned above. For details
reference the PMI protocol Micronote # xxx.
Although the MSV11-JD and MSV11-JE are PMI memories they can be used in
two other Q-bus configurations.
1. If either of these two memories are used in slots 1 and/or 2 of
a Q/CD backplane such as the H9276 (BA11-S box) or in the
MicroPDP-11 BA23 backplane, and with the standard 15MHZ KDJ11-B
cpu (non-fpj compatible) in slot 3, the system will perform PMI
memory cycles. In the case of BA23 backplanes, a maximum of two
memory modules may be used in slots ahead of the processor, with
a minimum of one memory module in front of the processor still
functioning as PMI memory. In the case of the H9276 backplane
a number of MSV11-JD/JE memory modules may be used ahead of the
processor bringing the system to a full 4MB of PMI memory.
2. If in a Q/CD or BA23 backplane the memories reside in slots 2&3
with either of the KDF11 or KDJ11 processors in the slot 1
the MSV11-J memories will respond as standard Q-bus memories,
performing normal Q-bus and block mode memory cycles. This use
of the MSV11-J memories is also true for the MicroVAX cpu.
However the fact that the MicroVAX I cpu is a two board set
requires a slightly different configuration. Slots 1&2 will be
used for the MicroVAX I cpu boards with only one memory card
used, that being located in slot 3 for the BA23 backplane and
one or more memory cards being used for other Q/CD backplanes.
The only constraint with either of the second configurations is
that in the BA23 or other Q/CD backplanes no module may be
placed adjacent to the MSV11-J that uses pins in the CD
connector. Instead leave an empty slot between the MSV11-J and
this option. An option which does not use the CD interconnect
may be placed adjacent to the MSV11-J.
MSV11-M
-------
The MSV11-M has two versions; the MSV11-MA and the MSV11-MB. The
MSV11-MA (M7506-AA) is a half populated dual sized Q-bus memory module
which contains 0.5MB of MOS RAM using 256K parts. The second version
the MSV11-MB (M7506-BA) is a fully populated dual size Q-bus memory
module containing 1MB of MOS RAM using 256K parts.
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uNOTE # 028
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MEMORY COMPARISON TABLE
-----------------------
+-----------------------------------------------------------------------+
|ATTRIBUTE | MSV11-QA/QB/QC | MSV11-MA/MB | MSV11-JB/JC/JD/JE|
+--------------+--------------------+----------------+------------------+
|MEMORY SIZE | 1MB, 2MB, 4MB | 0.5MB, 1MB | 1MB, 2MB |
+--------------+--------------------+----------------+------------------+
|FORM FACTOR | QUAD | DUAL | QUAD |
+--------------+--------------------+----------------+------------------+
|SYSTEM SIZE | Q18/Q22 | Q18/Q22 | PMI/CD ONLY |
+--------------+--------------------+----------------+------------------+
|BLOCK MODE | YES | YES | YES (JD/JE ONLY)|
+--------------+--------------------+----------------+------------------+
|BLOCK MODE | YES FOR REV-A | NO | NO |
|CONFIGURABLE | NO FOR REV-C |(DEFAULT OPTION)| (DEFAULT OPTION) |
+--------------+--------------------+----------------+------------------+
|AC BUS LOADS | 2.4 | 2.0 | 2.5 |
+--------------+--------------------+----------------+------------------+
|DC BUS LOADS | 1.0 | 1.0 | 0.5 |
+--------------+--------------------+----------------+------------------+
|AMPS @ +5 VDC | TYP MAX | TYP MAX | TYP MAX |
| | QA 2.4 3.99 | MA 2.19 3.11 | JB/JD 1.5 3.94 |
|(ACTIVE ONLY) | QB 2.3 3.59 | MB 2.22 3.34 | JC/JE 1.7 4.29 |
| | QC 2.5 4.30 | | |
+--------------+--------------------+----------------+------------------+
|AMPS @ +12VDC | NO +12V SUPPLY NEEDED |
+--------------+--------------------+----------------+------------------+
|WATTS | TYP MAX | TYP MAX | TYP MAX |
| | QA 12.0 20.95 | MA 11.0 16.3 | JB/JD 7.5 19.7 |
|(ACTIVE ONLY) | QB 11.5 18.85 | MB 11.1 17.5 | JC/JE 8.5 21.5 |
| | QC 12.5 22.58 | |
+--------------+--------------------+----------------+------------------+
|MEMORY ERROR | PARITY | PARITY | ECC |
|CORERECTION | | | |
+--------------+--------------------+----------------+------------------+
|BATTERY BACKUP| YES FOR REV-C | YES | YES |
|SUPPORT | NO FOR REV-A | | |
+--------------+--------------------+----------------+------------------+
|DIAGNOSTICS |CVMSAA FOR PDP11s | SAME | CVMJA0 |
| |EHXMS FOR MICROVAX | SAME | |
+--------------+--------------------+----------------+------------------+
|MAINTENANCE | MP01931 | MP02053 | MP02056 |
|PRINTSET | | | |
+--------------+--------------------+----------------+------------------+
|USER GUIDE | EK-MSV1Q-UG | EK-MSV1M-UG | EK-MSV1J-UG |
+--------------+--------------------+----------------+------------------+
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