System Memory Interface

2.5SDRAM Address Mapping

SDRAM Address Mapping is shown in Table 2-3and Table 2-4.

Table 2-3. Normal Mode Memory Address Mapping

SDRAM

# Bits

 

 

The applications processor pin mapping to SDRAM devices

 

 

 

Bank x

(The address lines at the top of the columns are the processor address lines)

 

 

 

 

 

 

Row x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Device

Technology

A24

A23

A22

A21

A20

A19

A18

A17

A16

A15

A14

A13

A12

A11

 

A10

Col

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1Mx16

16Mbit

1x11x8

 

 

 

BS0

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2Mx8

16Mbit

1x11x9

 

 

 

BS0

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4Mx4

16Mbit

1x11x10

 

 

 

BS0

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x12x8

 

 

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x12x9

 

 

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x12x10

 

 

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x12x11

 

 

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x13x8

 

BS0

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x13x9

 

BS0

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x13x10

 

BS0

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1x13x11

 

BS0

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2Mx32

64Mbit

2x11x8

 

 

BS1

BS0

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2x11x9

 

 

BS1

BS0

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2x11x10

 

 

BS1

BS0

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4Mx16/4Mx32

64Mbit/128Mbit

2x12x8

 

BS1

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8Mx8/8Mx16

64Mbit/128Mbit

2x12x9

 

BS1

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16Mx4/16Mx8

64Mbit/128Mbit

2x12x10

 

BS1

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32Mx4

128Mbit

2x12x11

 

BS1

BS0

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8Mx32

256Mbit

2x13x8

BS1

BS0

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16Mx16

256Mbit

2x13x9

BS1

BS1

A12

A11

A10

A9

A8

A7

A6

A5

A4

A3

A2

A1

 

A0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-6

PXA250 and PXA210 Applications Processors Design Guide

Page 32
Image 32
Intel PXA250 and PXA210 manual Sdram Address Mapping, Normal Mode Memory Address Mapping, Device Technology

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.