User's Manual

Page 48 of 83

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PART NUMBER T82002163

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Memory Stick

Overview

The Memory Stick is a medium for storing and transferring data. In its simplest form, the Memory

Stick is a small, pluggable card containing flash (or other similar) memory. This memory can store

multiple content types—for example, audio data or stored image data. In addition to this basic

form, other devices are available that use the standard Memory Stick definition (for example,

camera modules). The memory stick host controller provides the interface between the PXA27x

processor and one Memory Stick.

Note: The Sony Memory Stick Standard, Format Specification Version 1.3 (the Sony MS standard)

defines the Memory Stick interface and provides the basis for this chapter. For all details of

Memory Stick operation, refer to this Sony standard.

Features

•

Compliance with the Sony Memory Stick standard

•

Built-in transmit and receive FIFO buffers

•

Built-in CRC calculation and checking

•

Transfer clock up to 20 MHz

•

Data transfer using programmed I/O, interrupt to processor, and DMA

•

Automatic command execution when an interrupt from the Memory Stick is detected

Signal Descriptions

Table 17-1 summarizes the signals used by the memory stick host controller.

Operation

The memory stick host controller communicates with the Memory Stick using a half-duplex serial

protocol. This section presents an overview of the protocol. Always refer to the Sony MS standard

for details.