HANBit

HSD4M64D4B

URL:www.hbe.co.kr

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HANBit Electronics Co.,Ltd

REV.1.0 (August.2002)

FUNCTIONAL BLOCK DIAGRAM

PIN FUNCTION DESCRIPTION

Pin

Name

Input Function

CLK

System clock

Active on the positive going edge to sample all inputs.

/CE

Chip enable

Disables or enables device operation by masking or enabling all inputs except

CLK, CKE and DQM

CKE

Clock enable

Masks system clock to freeze operation from the next clock cycle.

CKE should be enabled at least one cycle prior to new command.

Disable input buffers for power down in standby.

CKE should be enabled 1CLK+tSS prior to valid command.

DQ0-63

Vcc

Vss

Two 0.1uF Capacitors

per each SDRAM

CKE

CLK

CAS

DQ0-15

RAS

DQM0

CE

WE

A0-A11 BA0-1

DQM1

U1

/CAS

/CS0

/RAS

CKE0

DQM0

CLKC

CLKA

CKE

CLK

CAS

DQ16-31

RAS

DQM2

CE

WE

A0-A11 BA0-1

DQM3

CKE

CLK

CAS

DQ32-47

RAS

DQM4

CE

WE

A0-A11

BA0-1

DQM5

CKE

CLK

CAS

DQ48-63

RAS

DQM6

CE

WE

A0-A11 BA0-1

DQM7

DQM2

DQM6

DQM4

U2

U4

U3

/WE

A0

– A11

BA0-1

DQM1

DQM3

DQM5

DQM7

/CS2