EBR25UC8ABFD-AE datasheet(5/12 Pages) ELPIDA

Part #	EBR25UC8ABFD-AE

Description	256MB Direct Rambus??DRAM RIMM??Module

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Manufacturer	ELPIDA [Elpida Memory]

Direct Link	http://www.elpida.com/en

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5 / 12 page

EBR25UC8ABFD

Data Sheet E0317E21 (Ver. 2.1)

5

Signal

Module

Connector Pads

I/O

Type

Description

RSCK

A59

I

VCMOS

Serial clock input. Clock source used to read from and

write to the RDRAM control registers.

SA0

B53

I

SVDD

Serial Presence Detect Address 0.

SA1

B55

I

SVDD

Serial Presence Detect Address 1.

SA2

B57

I

SVDD

Serial Presence Detect Address 2.

SCL

A53

I

SVDD

Serial Presence Detect Clock.

SDA

A55

I/O

SVDD

Serial Presence Detect Data (Open Collector I/O).

SIN

B36

I/O

VCMOS

Serial I/O for reading from and writing to the control

registers. Attaches to SIO0 of the first RDRAM on the

module.

SOUT

A36

I/O

VCMOS

Serial I/O for reading from and writing to the control

registers. Attaches to SIO1 of the last RDRAM on the

module.

SVDD

A56, B56

—

SPD Voltage. Used for signals SCL, SDA, SWP, SA0,

SA1 and SA2.

SWP

A57

I

SVDD

Serial Presence Detect Write Protect (active high).

When low, the SPD can be written as well as read.

VCMOS

A35, B35, A37, B37

—

CMOS I/O Voltage. Used for signals CMD, SCK, SIN,

SOUT.

VDD

A41, A42, A54, A58, B41,

B42, B54, B58

—

Supply voltage for the RDRAM core and interface

logic.

VREF

A51, B51

—

Logic threshold reference voltage for RSL signals.

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