S3C2440X datasheet(60/429 Pages) SAMSUNG

Part #	S3C2440X

Description	16/32-bit RISC microprocessor

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Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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60 / 429 page

2003.09.25

Preliminary product information describes products that are in development,

for which full characterization data and associated errata are not yet available

Specifications and information herein are subject to change without notice.

S3C2440X RISC MICROPROCESSOR

MEMORY CONTROLLER

DEC.13, 2002

5-19

SDRAM MODE REGISTER SET REGISTER (MRSR)

Register

Address

R/W

Description

Reset Value

MRSRB6

0x4800002C

R/W

Mode register set register bank6

xxx

MRSRB7

0x48000030

R/W

Mode register set register bank7

xxx

MRSR

Bit

Description

Initial State

Reserved

[11:10]

Not used

-

WBL

[9]

Write burst length

0: Burst (Fixed)

1: Reserved

x

TM

[8:7]

Test mode

00: Mode register set (Fixed)

01, 10 and 11: Reserved

xx

CL

[6:4]

CAS latency

000 = 1 clock,

010 = 2 clocks,

011=3 clocks

Others: reserved

xxx

BT

[3]

Burst type

0: Sequential (Fixed)

1: Reserved

x

BL

[2:0]

Burst length

000: 1 (Fixed)

Others: Reserved

xxx

Note: MRSR register must not be reconfigured while the code is running on SDRAM.

Important Note: In Sleep mode, SDRAM has to enter SDRAM self-refresh mode.

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