W9812G2KB datasheet(6/43 Pages) WINBOND

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W9812G2KB

Publication Release Date: Jun. 20, 2014

- 6 -

Revision: A01

BALL DESCRIPTION

BALL NUMBER

SYMBOL

FUNCTION

DESCRIPTION

G8,G9,F7,F3,G1,G2,

G3,H1,H2,J3,G7,H9

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.

J7,H8

BS0, BS1

Bank Select

Select bank to activate during row address latch time, or

bank to read/write during address latch time.

R8,N7,R9,N8,P9,M8

,M7,L8,L2,M3,M2,P1

,N2,R1,N3,R2,E8,D7

,D8,B9,C8,A9,C7,A8

,A2,C3,A1,C2,B1,D2

,D3,E2

DQ0

DQ31

Data

Input/ Output

Multiplexed pins for data output and input.

Chip Select

Disable or enable the command decoder. When

command decoder is disabled, new command is ignored

and previous operation continues.

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.

CAS

Column Address

Strobe

Referred to RAS

Write Enable

Referred to RAS

K9,K1,F8,F2

DQM0~3

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.

CLK

Clock Inputs

System clock used to sample inputs on the rising edge of

clock.

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.

A7,F9,L7,R7

VDD

Power

Power for input buffers and logic circuit inside DRAM.

A3,F1,L3,R3

VSS

Ground

Ground for input buffers and logic circuit inside DRAM.

B2,B7,C9,D9,E1,L1,

M9,N9,P2,P7

VDDQ

Power for I/O

buffer

Separated power from VDD, to improve DQ noise

immunity.

B8,B3,C1,D1,E9,L9,

M1,N1,P3,P8

VSSQ

Ground for I/O

buffer

Separated ground from VSS, to improve DQ noise

immunity.

E3,E7,H3,H7,K2,K3

No Connection

No connection

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