Cirrus GD542x SVGA Adapters

SVGA (1MB Cirrus Logic)
Japanese SVGA (1MB Cirrus Logic)
Reply Video Adapter

GD542x IREF Circuit Comparison (and fix)

CL-542x Data Book
CL-542x Technical Reference Manual

Compatible SOJ DRAM Chips
SOJ DRAM Pinout


Compatible SOJ DRAM Chips (from Peter)

The memory modules should be 70ns or faster. If you are adding extra video memory on the adapter, use chips with the same or lower access time as the existing modules.

ManufacturerPart
FujitsuMB814260
GoldstarGM71C4260
HitachiHM514260
HyundaiHY514260
MicronMT4C16257
MitsubishiM5M44260
MotorolaMCM54260
NECµPD424260
OKIMSM514260(ALS)
SamsungKM416C256 (alt)
Texas InstrumentsTMS45160
ToshibaTC514260

The same chips are used on the PC750, PC720 (Japanese) IBM planars and Reply PowerBoards.


SOJ DRAM Pinout

Pinout of the 256K x 16 DRAM 40-pin SOJ chips.

               /--------------+
        Vcc  --+o 1        40 +-- Vss
        DQ1  --+  2        39 +-- DQ16
        DQ2  --+  3        38 +-- DQ15
        DQ3  --+  4        37 +-- DQ14
        DQ4  --+  5        36 +-- DQ13
        Vcc  --+  6        35 +-- Vss
        DQ5  --+  7        34 +-- DQ12
        DQ6  --+  8        33 +-- DQ11
        DQ7  --+  9        32 +-- DQ10
        DQ8  --+ 10        31 +-- DQ9
        nc   --+ 11        30 +-- nc
        nc   --+ 12        29 +-- CASL#
        WE#  --+ 13        28 +-- CASH#
        RAS# --+ 14        27 +-- OE#
        nc   --+ 15        26 +-- A8
        A0   --+ 16        25 +-- A7
        A1   --+ 17        24 +-- A6
        A2   --+ 18        23 +-- A5
        A3   --+ 19        22 +-- A4
        Vcc  --+ 20        21 +-- Vss
               +--------------+

Vcc = +5V DC, Vss = GND
Signal marked with # are active LOW.
Source: Micron Technology Inc. Datasheet, ASCII Art by PHW.


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