EM44DM0888LBA datasheet(6/29 Pages) EOREX

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EM44DM0888LBA

Feb. 2012

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Pin Description (Continued)

B3,A2,B7,A8

RDQS,/RDQS

, DQS,/DQS

(Data Strobe)

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

data, centered in write data. An RDQS option using DM pin can be

enabled via the EMRS(1) to simplify read timing.

The data strobes DQS and RDQS may be used in single ended mode

or paired with optional complimentary signals /DQS and /RDQS to

provide differential pair signaling to the system during both reads and

writes. An EMRS(1) control bit enables or disables all complementary

data strobe signals.

(Data Mask)

DM is an input mask signal for write data. Input data is masked when

DM is sampled HIGH coincident with that input data during a Write

access. DM is sampled on both edges of DQS. Although DM pins are

input only, the DM loading matches the DQ and DQS loading. DM is

enabled by EMRS command.

C8,C2,D7,D3,

D1,D9,B1,B9

DQ0~7

(Data Input/Output)

Data inputs and outputs are on the same pin.

A1,L1,E9,H9/

A3,E3,J1,K9

VDD/VSS

(Power Supply/Ground)

VDD and VSS are power supply for internal circuits.

A9,C1,C3,C7,

C9/A7,B2,B8,

D2,D8

VDDQ/VSSQ

(DQ Power Supply/DQ Ground)

VDDQ and VSSQ are power supply for the output buffers.

E1/E7

VDDL/VSSDL

(DLL Power Supply/DLL Ground)

VDDL and VSSDL are power supply for DLL circuits

VREF

(Reference Voltage)

SSTL_1.8 reference voltage

L3,L7

(No Connection)

No internal electrical connection is present.

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