EtronTech

EM6AA320

Etron Technology, Inc.

No. 6, Technology Rd. V, Science-Based Industrial Park, Hsinchu, Taiwan 30077, R.O.C.

TEL: (886)-3-5782345

FAX: (886)-3-5778671

Etron Technology, Inc., reserves the right to make changes to its products and specifications without notice.

8M x 32 DDR SDRAM

Preliminary (Rev 0.6 5/2006)

Features

• Fast clock rate: 300/275/250/200 MHz

• Differential Clock CK & CK# input

• 4 Bi-directional DQS. Data transactions on both

edges of DQS (1DQS / Byte)

• DLL aligns DQ and DQS transitions

• Edge aligned data & DQS output

• Center aligned data & DQS input

• 4 banks operation

• Programmable mode and extended mode

registers

- CAS# Latency: 3, 4, 5

- Burst length: 2, 4, 8

- Burst Type: Sequential & Interleave

• Full page burst length for sequential type only

• Start address of full page burst should be even

• All inputs except DQ’s & DM are at the positive

edge of the system clock

• No Write-Interrupted by Read function

• 4 individual DM control for write masking only

• Auto Refresh and Self Refresh

• 4096 refresh cycles / 32ms

• Power supplies :

± 5%

± 5%

• Interface : SSTL_2 I/O compatible

Overview

The EM6AA320 DDR SDRAM is a high-speed CMOS

double data rate synchronous DRAM containing 256

Mbits. It is internally configured as a quad 2M x 32

DRAM with a synchronous interface (all signals are

registered on the positive edge of the clock signal, CK).

Data outputs occur at both rising edges of CK and CK#.

Read and write accesses to the SDRAM are burst

oriented; accesses start at a selected location and

continue for a programmed number of locations in a

programmed sequence.

Accesses begin with the registration of a BankActivate

command, which is then followed by a Read or Write

command.

The EM6AA320 provides programmable Read or Write

burst lengths of 2, 4, 8. An auto precharge function may

be enabled to provide a self-timed row precharge that is

initiated at the end of the burst sequence.

The refresh functions, either Auto or Self Refresh are

easy to use.

In addition, EM6AA320 features programmable DLL

option. By having a programmable mode register and

extended mode register, the system can choose the

most suitable modes to maximize its performance.

These devices are well suited for applications requiring

high memory bandwidth, result in a device particularly

well suited to high performance main memory and

graphics applications.

Ordering Information

Part Number

Frequency

Power Supply

Package

EM6AA320BI-3.3S

(*)

300MHz

EM6AA320BI-3.6S

(*)

275MHz

EM6AA320BI-4S

(*)

250MHz

EM6AA320BI-5S

(*)

200MHz

FBGA

* : S indicates stack die package