Memory Bus and Pcmcia AC Specifications

Power and Clocking

Table 8-10. Sleep Mode Timing Specifications (Sheet 2 of 2)

Symbol	Description	Min	Typical	Max

tD_FAULT	Delay between PWR_EN asserted and nVDD_FAULT	—	—	10 ms
	deasserted
tDSM_OUT	Delay between PWR_EN asserted and nRESET_OUT	28.0 ms	—	80 ms
	deasserted, OPDE Set
tDSM_OUT_O	Delay between PWR_EN asserted and nRESET_OUT	10.35 ms	—	10.5 ms
	deasserted, OPDE Clear

8.6Memory Bus and PCMCIA AC Specifications

This section gives the timing information for the following types of memory:

•SRAM / ROM / Flash / Synchronous Fast Flash Asynchronous writes (Table 8-11)

•Variable Latency I/O (Table 8-12)

•Card Interface (PCMCIA or Compact Flash) (Table 8-13)

•Synchronous Memories (Table 8-14)

Table 8-11. SRAM / ROM / Flash / Synchronous Fast Flash AC Specifications (3.3 V)

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

	SRAM / ROM / Flash / Synchronous Fast Flash (WRITES) (Asynchronous)

tromAS	MA(25:0) setup to nCS, nOE, nSDCAS (as nADV)	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
tromAS	asserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
	asserted

tromAH	MA(25:0) hold after nCS, nOE, nSDCAS (as nADV)	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
tromAH	deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
	deasserted

tromASW	MA(25:0) setup to nWE asserted	30 ns	25.5 ns	22.5 ns	20.4 ns	18 ns	2

tromAHW	MA(25:0) hold after nWE deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

tromCES	nCS setup to nWE asserted	20 ns	17 ns	15 ns	13.6 ns	12 ns	3

tromCEH	nCS hold after nWE deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1

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

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

tromDH	MD(31:0), DQM(3:0) write data hold after nWE	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
tromDH	deasserted	10 ns	8.5 ns	7.5 ns	6.8 ns	6 ns	1
	deasserted

tromNWE	nWE high time between beats of write data	20 ns	17 ns	15 ns	13.6 ns	12 ns	3

NOTES:

1.This number represents 1 MEMCLK period

2.This number represents 3 MEMCLK periods

3.This number represents 2 MEMCLK periods

PXA250 and PXA210 Applications Processors Design Guide

8-15

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 Memory Bus and Pcmcia AC Specifications

Models: PXA250 and PXA210