High-Speed Usb; Memory Card Interfaces - Nokia N900 Service Manual

RX-51
System Module

High-speed USB

High-speed USB
The device can transmit and receive USB data at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-
speed (1.5Mbit/s). The external interface is the micro-B connector X5300. The interface between USB
transceiver and micro-B receptacle is the standard USB interface specified in the Universal Serial Bus
specification Rev. 2.0. The interface from the transceiver to OMAP is standard ULPI interface.

Memory card interfaces

There are two memory card interfaces. One for internal mass memory called eMMC and one for hot swappable
microSD card. Both are standard MMC/SD interfaces. Both interfaces use 48 MHz clock. MicroSD uses 4 datalines
and eMMC uses 8 datalines.
Both cards are protected against sudden battery removal with a magnetic sensor that recognizes the removal
of battery cover. When the battery cover is removed, the sensor sends an interrupt to OMAP and both memory
cards are powered down. This also enables hot swapping for microSD card.
Issue 1
Figure 55 FM transmitter
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