Pin Description Table

Symbol

Description

Type

Comments

SA

Synchronous Address Inputs

Input

—

R

Synchronous Read

Input

Active Low

W

Synchronous Write

Input

Active Low

BW0–BW3

Synchronous Byte Writes

Input

Active Low

K

Input Clock

Input

Active High

K

Input Clock

Input

Active Low

TMS

Test Mode Select

Input

—

TDI

Test Data Input

Input

—

TCK

Test Clock Input

Input

—

TDO

Test Data Output

Output

—

HSTL Input Reference Voltage

Input

—

ZQ

Output Impedance Matching Input

Input

—

Qn

Synchronous Data Outputs

Output

—

Dn

Synchronous Data Inputs

Input

—

Doff

Disable DLL when low

Input

Active Low

CQ

Output Echo Clock

Output

—

CQ

Output Echo Clock

Output

—

Power Supply

Supply

1.8 V Nominal

Isolated Output Buffer Supply

Supply

1.5 V Nominal

Power Supply: Ground

Supply

—

QVLD

Q Valid Output

Output

—

ODT

On-Die Termination

Input

—

NC

No Connect

—

—

NF

No Function

—

—

GS8672D20/38BE-633/550/500/450/400

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.

Rev: 1.03c 8/2017

4/30

© 2011, GSI Technology

Notes:

1. NC = Not Connected to die or any other pin

2. NF= No Function. There is an electrical connection to this input pin, but the signal has no function in the device. It can be left unconnected,