Example Form Factor Reference Design

Schematic Diagrams

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B.1 Notes

The example form factor reference design schematics in this appendix have known issues and assumptions that need to be assessed for each board design. This appendix documents the issues that have been discovered and provides revision data for the schematics. This appendix also points out some of the design specific assumptions that were made in designing this board.

Page 4: The schematic supports the SA1110 legacy mode for addressing the SDRAM. See SDRAM section of the design guidelines to explain normal vs. legacy addressing modes.

Page 10: U26 allows the CF card to access the I2C interface.

Page 11: The MMC slot has resistor jumpers to select SDCARD and/or MMC card support. If the users wants to support both SCARD and MMC, populate the resistor values in the SD column of the CARD selection table. If MMC card support only populate the resistors under the MMC column in the table.

Page 11: The JTAG port on this board assumes that it is connected to a specific JTAG bridge board. If you follow this design guide, you should not need the bridge board. See the JTAG section of this document for more details on this bridge board implementation.

Page 11: J19 pin 9 requires a 1.5 k pull down.

Page 13: U33, U34, U35, U40, and surrounding circuits are to support a legacy sharp LCD. Refer to that vendor’s design guidelines if you are integrating a different LCD display.

Page 14: U36, U37, U39, J13, and surrounding circuits including the resistor divider network in the upper left hand corner support a legacy Sharp LCD. Refer to that vendor’s design guidelines if you are integrating a different LCD display.

Page 14: J14 is the Toshiba LCD connector. Confirm the pinout before layout.

B.2 Schematic Diagrams

The example form factor reference design schematics are on the following pages.

PXA250 and PXA210 Applications Processors Design Guide

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Intel PXA250 and PXA210 manual Example Form Factor Reference Design Schematic Diagrams

PXA250 and PXA210 specifications

The Intel PXA250 and PXA210 processors, part of the Intel XScale architecture, were introduced in the early 2000s, targeting mobile and embedded applications. They are known for their low power consumption, high performance, and advanced multimedia capabilities, making them suitable for a wide range of devices, including PDAs, smartphones, and other portable computing devices.

The PXA250, which operates at clock speeds ranging from 400 MHz to 624 MHz, features a superscalar architecture that allows it to issue multiple instructions per clock cycle. This enhances the overall performance for demanding applications while maintaining low power usage. It supports a variety of peripheral interfaces, including USB, Ethernet, and various memory types, which contributes to its versatility in different product designs.

One of the key technologies in the PXA250 is the integrated Intel Smart Repeat Technology, which optimizes data processing, thereby reducing the amount of power consumed during operation. This feature is particularly important for battery-powered devices, as it extends the overall battery life, allowing for longer usage times in mobile environments. Additionally, the PXA250 includes a dedicated graphics acceleration unit, which enables enhanced graphics and multimedia performance suited to modern applications at the time.

In contrast, the PXA210 is a more entry-level processor, aimed at cost-sensitive applications. Operating at lower clock speeds, typically around 200 MHz to 400 MHz, it forgoes some of the advanced performance features of the PXA250 while still offering a good balance of performance and power efficiency. The PXA210 is less complex, making it suitable for simpler devices that do not require the extensive capabilities of the PXA250.

Both processors utilize the Intel XScale architecture, which is based on the ARM instruction set. They are built on a 0.13-micron process technology, enabling higher density and lower power consumption compared to their predecessors. With integrated memory controllers and bus interfaces, they facilitate efficient data handling and connectivity options.

In summary, both the Intel PXA250 and PXA210 processors played a crucial role in the evolution of mobile computing by providing powerful processing capabilities with energy efficiency. Their features and technologies enabled device manufacturers to create innovative products that catered to the growing demand for portable devices during that era.