T431616D データシートの表示（PDF） - Taiwan Memory Technology

部品番号

コンポーネント説明

メーカー

T431616D

1M x 16 SDRAM 512K x 16bit x 2Banks Synchronous DRAM

Taiwan Memory Technology 

tm TE

CH

T431616D/E

6 Write and AutoPrecharge command (refer to the following figure)

(RAS# = "H", CAS# = "L", WE# = "L", A11 = “V”, A10 = "H", A0-A7 = Column Address)

The Write and AutoPrecharge command performs the precharge operation automatically after the write

operation. Once this command is given, any subsequent command can not occur within a time delay of {(burst

length -1) + tWR + tRP(min.)}. At full-page burst, only the write operation is performed in this command and the

auto precharge function is ignored.

T0

T1

T2

T3

T4

T5

T6

T7

T8

CLK

COMMAND

Bank A

Activate

NOP

NOP

Write A

AutoPrecharge

NOP

NOP

NOP

NOP

NOP

CAS# latency=1

tCK1, DQ's

CAS# latency=2

tCK2, DQ's

CAS# latency=3

tCK3, DQ's

DIN A0

DIN A1

tDAL

*

DIN A0

DIN A1

tDAL

*

tDAL

DIN A0

DIN A1

*

tDAL= tWR + tRP

* Begin AutoPrecharge

Bank can be reactivated at completion of tDAL

Burst Write with Auto-Precharge (Burst Length = 2, CAS# Latency = 1, 2, 3)

7 Mode Register Set command

(RAS# = "L", CAS# = "L", WE# = "L", A11 = “V”, A10 = “V”, A0-A9 = Register Data)

The mode register stores the data for controlling the various operating modes of SDRAM. The Mode

Register Set command programs the values of CAS# latency, Addressing Mode and Burst Length in the Mode

register to make SDRAM useful for a variety of different applications. The default values of the Mode Register

after power-up are undefined; therefore this command must be issued at the power-up sequence. The state of pins

A0~A9 and A11 in the same cycle is the data written to the mode register. One clock cycle is required to

complete the write in the mode register (refer to the following figure). The contents of the mode register can be

changed using the same command and the clock cycle requirements during operation as long as both banks are in

the idle state.

TM Technology Inc. reserves the right

P. 11

to change products or specifications without notice.

Publication Date: FEB. 2007

Revision: A

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