MultiMediaCard (MMC)

5.1.2How to Wire

Notice in the example schematic (Figure 5-1, “Applications Processor MMC and SDCard Signal Connections” on page 5-3) an SDCard socket is used. The signals on the socket are defined in Table 5-2.

Table 5-2. SDCard Socket Signals

Signal Name

Pin #

 

 

DAT3

1

 

 

CMD

2

 

 

VSS1

3

 

 

VDD

4

 

 

CLK

5

 

 

VSS2

6

 

 

DAT0

7

 

 

DAT1

8

 

 

DAT2

9

 

 

As stated previously, the PXA250 MMC controller can be connected to either an MMC device or an SDCard device, but you are limited to which device installs in which socket. Refer to Table 5-3for information on sockets and device supported by the MMC controller.

Table 5-3. MMC Controller Supported Sockets and Devices

Sockets

Devices Supported

 

 

SDCard socket

SDCard device

MMC device

 

 

 

MMC socket

MMC device

 

 

Figure 5-1is a schematic that supports both MMC and SDCard devices. In the schematic, the signals SA_MMCLK, SA_MMCMD, and SA_DAT correspond to the applications processor signals MMCLK, MMCMD, and MMDAT, respectively. These three signals are also directly connected to the socket.

5-2

PXA250 and PXA210 Applications Processors Design Guide

Page 57 Page 59
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Intel PXA250 and PXA210 manual How to Wire, SDCard Socket Signals, MMC Controller Supported Sockets and Devices
Page 57 Page 59

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.
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