SM5907AF Datasheet, PDF (13/30 Pages) Nippon Precision Circuits Inc – compression and non compression type shock-proof memory controller

MUTE, CMP12 settings 83
SM5907AF
Bit Name
D7
D6 MUTE
D5
D4
D3 CMP12
D2
D1
D0
Function
Forced muting (changes instantaneously)
12-bit comparison connect/ 16-bit comparison connect
83hex = 1000 0011
H operation Reset level
Mute ON
L
12-bit comparison
L
Refer to "Force mute", "12-bit comparison connection".
Option settings 85
Bit Name
D7 RAMS1
D6 RAMS2
D5 YFLGS
D4 YFCKP
D3 COMPFB
D2 COMP6B
D1 COMP5B
D0 COMP4B
85hex = 1000 0101
Function
DRAM type setting
RAMS1=0 RAMS2=0 when 16M DRAM(4M × 4bit) × double
RAMS1=1 RAMS2=0 when 4M DRAM(1M × 4bit) × single
RAMS1=0 RAMS2=1 when 4M DRAM(1M × 4bit) × double
RAMS1=1 RAMS2=1 when 16M DRAM(4M × 4bit) × single
FLAG6 set conditions (reset using status read command 90H)
- When YFLGS=0, YFCKP=0, YFCLK input falling edge, YFLAG=L
- When YFLGS=0, YFCKP=1, YFCLK input rising edge, YFLAG=L
- When YFLGS=1, YFCKP=0, YFLAG=L
- When YFLGS=1, YFCKP=1, YFLAG=H
Full-bit compression mode
6-bit compression mode
5-bit compression mode
4-bit compression mode
H operation Reset level
L
L
L
L
L
H
L
L
When the number of compression bits is set incorrectly (2 or more bits in D0 to D3 are set to 1 or all bits are set to 0),
6-bit compression mode is selected.
NIPPON PRECISION CIRCUITS-13