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3. TECHNICAL BRIEF
3.9.1 Pin Assignment
Since the controller can only be configured as either the host of Memory Stick or the host of SD/MMC
Memory Card at one time, pins for Memory Stick and SD/MMC Memory Card are shared in order to save
pin counts. The following lists pins required for Memory Stick and SD/MMD Memory Card. Figure
3.9.2 shows how they are shared. In Table 3.9.1, all I/O pads have embedded both pull up and pull
down resistor because they are shared by both the Memory Stick and SD/MMC Memory Card. Pins
2,4,5,8 are only useful for SD/MMC Memory Card. Pull down resistor for these pins can be used for
power saving. All embedded pull-up and pull-down resistors can be disabled by programming the
corresponding control registers if optimal pull-up or pull-down resistor are required on the system
board. The pin VDDPD is used for power saving. Power for Memory Stick or SD/MMC Memory Card can
be shut down by programming the corresponding control register. The pin WP(Write Protection) is
only valid when the controller is configured for SD/MMC Memory Card. It is used to detect the status of
Write Protection Switch on SD/MMC Memory Card.
Table 3.9.1 Sharing of pins for Memory Stick and SD/MMC Memory Card controller
LGE Internal Use Only
3. TECHNICAL BRIEF
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