Intel PXA250 and PXA210 guide

Power and Clocking

Table 8-12. Variable Latency I/O Interface AC Specifications (3.3 V)

			MEMCLK Frequency (MHz)
Symbol	Description						Notes
		99.5	118.0	132.7	147.5	165.9

	Variable Latency IO Interface (VLIO) (Asynchronous)

tvlioAS	MA(25:0) setup to nCS asserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tvlioASRW	MA(25:0) setup to nOE or nPWE asserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tvlioAH	MA(25:0) hold after nOE or nPWE deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tvlioCES	nCS setup to nOE or nPWE asserted	20 ns	17 ns	15 ns	13.6 ns	12 ns	2

tvlioCEH	nCS hold after nOE or nPWE deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tvlioDSW	MD(31:0), DQM(3:0) write data setup to nPWE asserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tvlioDSWH	MD(31:0), DQM(3:0) write data setup to nPWE	20 ns	17 ns	15 ns	13.6 ns	12 ns	2
tvlioDSWH	deasserted	20 ns	17 ns	15 ns	13.6 ns	12 ns	2
	deasserted

tvlioDHW	MD(31:0), DQM(3:0) hold after nPWE deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tvlioDHR	MD(31:0) read data hold after nOE deasserted	0 ns	0 ns	0 ns	0 ns	0 ns	—

tvlioRDYH	RDY hold after nOE, nPWE deasserted	0 ns	0 ns	0 ns	0 ns	0 ns	—

tvlioNPWE	nPWE, nOE high time between beats of write or read	20 ns	17 ns	15 ns	13.6 ns	12 ns	2
tvlioNPWE	data	20 ns	17 ns	15 ns	13.6 ns	12 ns	2
	data

NOTES:

1.This number represents 1 MEMCLK period

2.This number represents 2 MEMCLK periods

Table 8-13. Card Interface (PCMCIA or Compact Flash) AC Specifications (3.3 V)

			MEMCLK Frequency (MHz)
Symbol	Description						Notes
		99.5	118.0	132.7	147.5	165.9

	Card Interface (PCMCIA or Compact Flash) (Asynchronous)

tcardAS	MA(25:0), nPREG, PSKTSEL, nPCE setup to nPWE,	20 ns	17 ns	15 ns	13.6 ns	12 ns	1
tcardAS	nPOE, nPIOW, or nPIOR asserted	20 ns	17 ns	15 ns	13.6 ns	12 ns	1
	nPOE, nPIOW, or nPIOR asserted

tcardAH	MA(25:0), nPREG, PSKTSEL, nPCE hold after nPWE,	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
tcardAH	nPOE, nPIOW, or nPIOR deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
	nPOE, nPIOW, or nPIOR deasserted

tcardDS	MD(31:0) setup to nPWE, nPOE, nPIOW, or nPIOR	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
tcardDS	asserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
	asserted

tcardDH	MD(31:0) hold after nPWE, nPOE, nPIOW, or nPIOR	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
tcardDH	deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
	deasserted

tcardCMD	nPWE, nPOE, nPIOW, or nPIOR command assertion	30 ns	25.5 ns	22.5 ns	20.4 ns	18 ns	1

NOTE:

1. These numbers are minimums. They can be much longer based on the programmable Card Interface timing registers.

8-16	PXA250 and PXA210 Applications Processors Design Guide

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.

Intel PXA250 and PXA210 manual Variable Latency I/O Interface AC Specifications 3.3

Models: PXA250 and PXA210

Table 8-12. Variable Latency I/O Interface AC Specifications (3.3 V)

Symbol

Description

Symbol

Description

PXA250 and PXA210 Applications Processors Design Guide

PXA250 and PXA210 specifications