sm5903b Seiko NPC Corp., sm5903b Datasheet - Page 13

• Manufacturer Part Number: sm5903b
• Description: Shock-proof Memory Controller
• Manufacturer: Seiko NPC Corp.

MUTE, CMP12 settings 83
Option settings 85
D7
D6
D5
D4
D3
D2
D1
D0
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Bit
COMPFB
COMP6B
COMP5B
COMP4B
CMP12
RAMS1
RAMS2
YFCKP
MUTE
YFLGS
Name
Name
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),
- When YFLGS=0, YFCKP=0, YFCLK input falling edge, YFLAG=L
- When YFLGS=0, YFCKP=1, YFCLK input rising edge, YFLAG=L
RAMS1=0 RAMS2=0 when 1MDRAM(256k × 4bit) × single
RAMS1=1 RAMS2=1 when 16MDRAM(4M × 4bit) × single
FLAG6 set conditions (reset using status read command 90H)
RAMS1=0 RAMS2=1 when 4MDRAM(1M × 4bit) × double
RAMS1=1 RAMS2=0 when 4MDRAM(1M × 4bit) × single
12-bit comparison connect/ 16-bit comparison connect
Forced muting (changes instantaneously)
- When YFLGS=1, YFCKP=1, YFLAG=H
- When YFLGS=1, YFCKP=0, YFLAG=L
Full-bit compression mode
6-bit compression mode
5-bit compression mode
4-bit compression mode
DRAM type setting
SM5903BF
Function
Function
Refer to "Force mute", "12-bit comparison connection".
NIPPON PRECISION CIRCUITS-13
6-bit compression mode is selected.
83hex =
85hex =
12-bit comparison
H operation
Mute ON
H operation Reset level
1000 0101
1000 0011
Reset level
H
L
L
L
L
L
L
L
L
L