MultiMediaCard (MMC)

Warning: Connecting VSS2 to something other than the power supply ground violates The MultiMediaCard System Specification, Version 2.1. Because the MMC specification does not state that VSS1 and VSS2 must be connected internal to the MMC device, the design in Figure 5-1may not work with all MMC devices. Use caution when using the card detection method shown in Figure 5-1.

5.1.3Simplified Schematic

Figure 5-2shows another SDCard socket. In this case, all applications processor signals are connected to the socket. This socket does not have a common signal for the write protect and card detect and are connected to the two tabs shown on the left side of the diagram. Inserting a card into the socket may cause the write protect signal and will cause the card detect signal to change states and must be interpreted by the CPLD software.

Figure 5-2. Applications Processor MMC to SDCard Simplified Signal Connection

 

 

 

 

+3.3V

 

 

 

 

13

Jx

 

 

 

 

 

 

 

 

Rx

 

Rx

Rx

 

Rx

 

 

 

 

 

 

ESD

10K

10K

10K

10K

 

 

5% 0.1W

5% 0.1W

5% 0.1W

5% 0.1W

 

WP

11

 

 

 

 

 

SD_WP

 

 

 

 

 

 

 

 

 

CD

10

 

 

 

 

 

SD_CD

 

 

 

 

 

 

 

 

 

DAT1

8

 

 

 

 

 

 

 

DAT0

7

 

 

 

 

 

MMDAT

 

 

 

 

 

 

 

 

 

VSS2

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CLK

5

 

 

 

 

 

MMCLK

 

 

 

 

 

 

 

 

 

VDD

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VSS1

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CMD

2

 

 

 

 

 

MMCMD

 

 

 

 

 

 

 

MMCCS0

 

CD/DAT3

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DAT2

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

12

5638 SDMC_NORMAL_SPRG_EJCT

 

 

 

 

 

 

Kyoc 10 5638 009 353 833

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A8699-01

PXA250 and PXA210 Applications Processors Design Guide

5-5

Page 61
Image 61
Intel PXA250 and PXA210 manual Simplified Schematic

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.