ViewSonic VA1721wmb Service Manual page 18

Pin Diagram:
PIN Descriptions:
Symbol
CE#
SO
WP#
GND
Vcc
HOLD#
SCK
SI
ViewSonic Corporation
Type
Chip Enable: CE# goes low activates the device's internal
circuitries for device operation. CE# goes high deselects the
device and switches into standby mode to reduce the power
INPUT
consumption. When the device is not selected, data will not
be accepted via the serial input pin (SI), and the serial
output pin (SO) will remain in a high impedance state.
OUTPUT Serial Data Output
Write Protect A hardware program/erase protection for all or
partial of memory array. When the WP# pin is pulled t low,
whole or partial of memory array is write protected depends
INPUT
on the setting of BP2, BP1 and BP0 bits in the Status
Register, When the WP# is pulled high, the devices are not
write protected.
Ground
Device Power Supply
Hold: Pause serial communication with the master device
INPUT
without resetting the serial sequence.
INPUT Serial Data Clock
INPUT Serial Data Input
Description
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