Memory Stick Host Interface; Overview; Schematic/Block Diagram - Intel PXA27 Series Design Manual

Memory Stick Host Interface

17.1

Overview

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Intel PXA27x Processor Family (PXA27x processor) has a memory stick controller which allows
control and communication with a memory stick. This feature provides a small, plug-able
standardized form factor that allows for convenient data transfer. This is typically done through
flash memory on the memory stick.
17.2 Signals
The memory stick signals are implemented through the GPIOs of the PXA27x processor. Refer to
GPIO alternate function table in the GPIO section of the Intel
Developers Manual for the GPIO assignments of the memory stick signals.
The memory stick controller of the PXA27x processor controls the signals shown in
Table 17-1. Memory Stick Host Interface Signal List
Signal Name Type
MSBS Output
MSSDIO Bidirectional
nMSINS Input
MSSCLK Output
17.3

Schematic/Block Diagram

The implementation of a memory stick socket is specified by the memory stick standard. Refer to
the Sony* Memory Stick Standard, Format Specification Version 1.3 for more information.
Figure 17-1
the Sony Memory Stick Standard, Format Specification Version 1.3, the pull-up resistor R
be present to allow the memory stick host controller to detect an insertion or removal of a memory
stick. This pull-up resistor is external to both the memory stick socket and the PXA27x processor.
As this resistor is connected between VCC and VSS, use a high value resistor. A typical value used
is 1.0 M Ω or higher.
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Intel PXA27x Processor Family Design Guide
Serial protocol bus state signal
Referred to as BS in the Sony Memory Stick Standard, Format Specification Version 1.3
Serial protocol data signal
Referred to as SDIO in the Sony Memory Stick Standard, Format Specification Version 1.3
Stick insertion/extraction detect- terminal
Referred to as INS in the Sony Memory Stick Standard, Format Specification Version 1.3
Serial protocol clock signal
Referred to as SCLK in the Sony Memory Stick Standard, Format Specification Version 1.3
is a typical implementation of a memory stick socket with the PXA27x processor. Per
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PXA27x Processor Family
Description
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Table 17-1.
must
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II:17-1