SM5904BF Nippon Precision Circuits Inc, SM5904BF Datasheet - Page 11

• Manufacturer Part Number: SM5904BF
• Description: compression and non compression type shock-proof memory controller
• Manufacturer: Nippon Precision Circuits Inc

Functional description
SM5904BF has two modes of operation; shock-
proof mode and through mode.
Microcontroller interface
Commands from the microcontroller are input using
3-wire serial interface inputs; data (YMDATA), bit
clock (YMCLK) and load signal (YMLD).
Write command format (Commands 87)
Read command format (Commands 90, 91, 93)
Read command format (Command 92 (memory residual read))
Write command format (Commands 80 to 86)
YMDATA
YMDATA
YMDATA
YMDATA
YMCLK
YMCLK
ZSENSE
ZSENSE
YMLD
YMCLK
YMCLK
YMLD
YMLD
YMLD
D11 D10
D7
B7
B7
D6
B6
B6
D5
B5
B5
COMMAND 8bit
COMMAND 8bit
DATA 12bit
DATA 8bit
D4
D4
B4
B4
D3
D3
B3
B3
D2
D2
B2
B2
SM5904BF
D1
D1
B1
B1
D0
D0
B0
B0
In the case of a read command from the microcon-
troller, bit serial data is output (ZSENSE) synchro-
nized to the bit clock input (YMCLK).
B7
The operating sequences are controlled using com-
mands from a microcontroller.
B7
B6
B6
S7
S7
B5
B5
COMMAND 8bit
S6
S6
COMMAND 8bit
B4
B4
S5
RESIDUAL DATA 16bit
B3
B3
STATUS 8bit
S4
S1
NIPPON PRECISION CIRCUITS-11
B2
B2
S3
S0
B1
B1
M1 M2
S2
B0
B0
S1
S0
M7
M8