HANBit

HDD32M72B9

URL : www.hbe.co.kr

4

HANBit Electronics Co.,Ltd.

REV 1.0 (July. 2003)

PIN FUNCTION DESCRIPTION

Pin

Name

Input Function

CK, /CK

Clock

CK and CK are differential clock inputs. All address and control input signals are

sam-pled on the positive edge of CK and negative edge of CK. Output (read) data

is referenced to both edges of CK. Internal clock signals are derived from CK/CK.

CKE

Clock Enable

CKE HIGH activates, and CKE LOW deactivates internal clock signals, and device

input buffers and output drivers. Deactivating the clock 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 disabling outputs, which is achieved asynchronously. Input buffers,

excluding CK, CK and CKE are disabled during power-down and self refresh modes,

providing low standby power. CKE will recognizean LVCMOS LOW level prior to

VREF being stable on power-up.

/CS

Chip Select

CS enables(registered LOW) and disables(registered HIGH) the command decoder.

All commands are masked when CS is registered HIGH. CS provides for external

bank selection on systems with multiple banks. CS is considered part of the

command code.

A0 ~ A12

Address

Row/column addresses are multiplexed on the same pins.

Row address : RA0 ~ RA12, Column address : CA0 ~ CA9

BA0 ~ BA1

Bank select address

BA0 and BA1 define to which bank an ACTIVE, READ, WRITE or PRE-CHARGE

command is being applied.

/RAS

Row address strobe

Latches row addresses on the positive going edge of the CLK with /RAS low.

Enables row access & precharge.

/CAS

Column

address

strobe

Latches column addresses on the positive going edge of the CLK with /CAS low.

Enables column access.

/WE

Write enable

Enables write operation and row precharge.

Latches data in starting from /CAS, /WE active.

DQS0 ~ 8

Data Strobe

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

tered in write data. Used to capture write data.

DM0~8

Input Data Mask

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

sampled HIGH along with that input data during a WRITE access. DM is sampled

on both edges of DQS. DM pins include dummy loading internally, to matches the

DQ and DQS load-ing.

DQ0 ~ 63

Data input/output

Data inputs/outputs are multiplexed on the same pins.

CB0 ~ 7

Check Bit

Check Bits for ECC data are multiplexed on the same pins.

VDDQ

Supply

DQ Power Supply : +2.5V

± 0.2V.

VDD

Supply

Power Supply : +2.5V

± 0.2V (device specific).

VSS

Supply

DQ Ground.

VREF

Supply

SSTL_2 reference voltage.

VDDSPD

Supply

Serial EEPROM Power Supply : 3.3v

VDDID

VDD identification Flag