W9864G6KH-7 datasheet(5/42 Pages) WINBOND

Part #	W9864G6KH-7

Description	1M X 4 BANKS X 16 BITS SDRAM

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Manufacturer	WINBOND [Winbond]

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W9864G6KH

Publication Release Date: Nov. 12, 2013

- 5 -

Revision A02

5.

PIN DESCRIPTION

PIN NUMBER

PIN NAME

FUNCTION

DESCRIPTION

23 ~ 26, 22,

29 ~35

A0

A11

Address

Multiplexed pins for row and column address.

Row address: A0

A11. Column address: A0A7.

A10 is sampled during a precharge command to

determine if all banks are to be precharged or bank

selected by BS0, BS1.

20, 21

BS0, BS1

Bank Select

Select bank to activate during row address latch time,

or bank to read/write during address latch time.

2, 4, 5, 7, 8, 10,

11, 13, 42, 44,

45, 47, 48, 50,

51, 53

DQ0

DQ15

Data

Input/ Output

Multiplexed pins for data output and input.

19

CS

Chip Select

Disable or enable the command decoder. When

command decoder is disabled, new command is

ignored and previous operation continues.

18

RAS

Row Address

Strobe

Command input. When sampled at the rising edge of

the clock

RAS , CAS and WE define the

operation to be executed.

17

CAS

Column

Address Strobe Referred to RAS

16

WE

Write Enable

Referred to

RAS

39, 15

UDQM

LDQM

Input/output

mask

The output buffer is placed at Hi-Z (with latency of 2)

when DQM is sampled high in read cycle. In write

cycle, sampling DQM high will block the write

operation with zero latency.

38

CLK

Clock Inputs

System clock used to sample inputs on the rising

edge of clock.

37

CKE

Clock Enable

CKE controls the clock activation and deactivation.

When CKE is low, Power Down mode, Suspend

mode, or Self Refresh mode is entered.

1, 14, 27

VDD

Power

Power for input buffers and logic circuit inside DRAM.

28, 41, 54

VSS

Ground

Ground for input buffers and logic circuit inside

DRAM.

3, 9, 43, 49

VDDQ

Power for I/O

buffer

Separated power from VDD, to improve DQ noise

immunity.

6, 12, 46, 52

VSSQ

Ground for I/O

buffer

Separated ground from VSS, to improve DQ noise

immunity.

36, 40

NC

No Connection

No connection.

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