Service Manual
18
8.2 U108 (Serial Flash)
Pin Symbol I/O Description
1 CE# I The device is enabled by a high to low transition on CE#.
CE#
must remain low for the duration of any command
sequence.
2 SO I/O To transfer commands, addresses, or data serially into the
device.
3 WP# I/O The write protect (WP#) pin is used to enable/disable BPL
bit in
the status register.
4 VSS G Connect ground
5 SI I/O To transfer commands, addresses, or data serially into the
device
input are latched on the rising edge of the serial clock.
6 SCK I/O To provide the timing of serial interface.
Commands, addresses, or input data are latched on the
rising edge of the clock input, while output data is shifted
out on the
Falling edge of the clock input.
7 HOLD I/O To temporarily stop serial communication with SPI flash
memory without resetting the device.
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