SM5902AF Datasheet, PDF (37/40 Pages) Nippon Precision Circuits Inc – compression and non compression type shock-proof memory controller

SM5902AF
Device comparison with SM5856A1F
Pin differences
Pin No.
1
7
8
22
27
SM5856A1F
VDD
NTEST1
NTEST2
UC6
NOE / NCAS2
SM5902AF
VDD2
DIT
NTEST
VDD1
A10 / NCAS2
VDD pins
The SM5902AF operates from a 3 V supply volt-
age, but a built-in level shifter is provided for use
with external 5 V DRAM ICs. There are, therefore, 2
supply pins. VDD1 is the internal 3 V IC supply, and
VDD2 is the external DRAM interface supply.
If, however, the DRAM also operates from a 3 V
supply, VDD1 and VDD2 can be connected to the
same supply.
DIT pin
The SM5902AF incorporates a digital audio inter-
face output from pin DIT. Leave open circuit if not
used.
Microcontroller interface extensions
The SM5902AF supports additional function exten-
sions. Also, the UC6 pin has been removed, which
means that UC6-related commands have been
redefined.
Additional commands
Command
Bit
83H
D4
D5
86H
D4 to D7
87H
D0 to D11
90H
S5
91H
S3
Name
NS
CMP12
CP1, 2, LBIT, DIT
QAD0 to 3, QD0 to 7
BOVF
QRDY
Modified commands
Command
Bit
85H
D6, D7
92H
S0 to 7, M1 to 8
Name
RAMS1, 2
AM06 to 21
Obsolete commands
Command
Bit
81H
D5
82H
D5
93H
S5
Name
UC6OE
UC6WD
UC6RD
Function
Noise shaper ON/OFF switch
12-bit comparison connection ON/OFF switch
Digital audio interface settings
Subcode Q data settings
Input buffer overflow
Q data write buffer status
Function
External DRAM capacity
Place of data residual
Function
UC6 input/output settings
UC6 output settings
UC6 settings status
NIPPON PRECISION CIRCUITS-37