W949D6KB datasheet(8/60 Pages) WINBOND

8 / 60 page

W949D6KB / W949D2KB

Publication Release Date: Dec. 11, 2014

Revision: A01-002

- 8 -

SIGNAL NAME

TYPE

FUNCTION

DESCRIPTION

CKE

Input

Clock Enable

CKE HIGH activates, and CKE LOW deactivates

internal clock signals, and device input buffers and

output drivers. Taking CKE LOW provides

PRECHARGE, POWER DOWN and SELF REFRESH

operation (all banks idle), or ACTIVE POWER DOWN

(row ACTIVE in any bank). CKE is synchronous for all

functions except for SELF REFRESH EXIT, which is

achieved asynchronously. Input buffers, excluding CK,

CK and CKE, are disabled during power down and self

refresh mode which are contrived for low standby power

consumption.

LDQS,UDQS (x16);

DQS0~DQ3 (x32)

I/O

Data Strobe

Output with read data, input with write data. Edge-

aligned with read data, centered with write data. Used

to capture write data.

x16: LDQS: DQ0~DQ7; UDQS: DQ8~DQ15.

x32: DQS0: DQ0~DQ7; DQS1: DQ8~DQ15;

DQS2: DQ16~DQ23; DQS3: DQ24~DQ31.

VDD

Supply

Power

Power supply for input buffers and internal circuit.

VSS

Supply

Ground

Ground for input buffers and internal circuit.

VDDQ

Supply

Power for I/O

Buffer

Power supply separated from VDD, used for output

drivers to improve noise.

VSSQ

Supply

Ground for I/O

Buffer

Ground for output drivers.

No Connect

No internal electrical connection is present.

5.2

Addressing Table

Item

512 Mb

Number of banks

Bank address balls

BA0, BA1

Auto precharge ball

A10/AP

Type

Package

x16

Row addresses

A0-A12

Column addresses

A0-A9

tREFI(µs)

7.8

x32

Row addresses

A0-A12

Column addresses

A0-A8

tREFI(µs)

7.8

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