SM5907AF Datasheet, PDF (30/30 Pages) Nippon Precision Circuits Inc – compression and non compression type shock-proof memory controller

SM5907AF
Device comparison with SM5903BF
Pin difference
Pin No.
7 pin
SM5903BF
N.C.
SM5907AF
NCAS3
Microcontroller interface functions
85H (RAMS1=0, RAMS2=0)
SM5903BF: 1M DRAM × 1
SM5907AF: 16M DRAM × 2
92H (valid residual)
In the SM5907AF, if 16M DRAM × 2 configuration
is selected using the 85H command (85H
RAMS1=0, RAMS2=0), the residual data is 1-bit
shifted in order to represent the maximum
32Mbits.
As pin 7 on the SM5903BF is not connected inter-
nally, the possible DRAM configurations are 4M × 1,
4M × 2, and 16M × 1, all of which are completely
compatible with the SM5907AF.
Note that the chip process is different, and hence
some DC characteristics are different.
When 16M × 2 configuration is used, the microcon-
troller interface valid residual memory is different
(92H status read). See "Read command summary".
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to
improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for
the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits
are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision
Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modifica-
tion. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or
malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, includ-
ing compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirect-
ly, any products without first obtaining required licenses and approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
NIPPON PRECISION CIRCUITS INC.
4-3, FUKUZUMI 2 CHOME, KOTO-KU
TOKYO,135-8430, JAPAN
Telephon: [phone]
Facsimile: [phone]
http://www.npc.co.jp/ Email: [e-mail]
NP0018AE 2000.10
NIPPON PRECISION CIRCUITS-30