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

• Addressing Mode Select Field (A3)

The Addressing Mode can be one of two modes, Interleave Mode or Sequential Mode. Sequential

Mode supports burst length of 1, 2, 4, 8, or full page, but Interleave Mode only supports burst length

of 4 and 8.

A3

Addressing Mode

0

Sequential

1

Interleave

--- Addressing Sequence of Sequential Mode

An internal column address is performed by increasing the address from the column address which

is input to the device. The internal column address is varied by the Burst Length as shown in the

following table. When the value of column address, (n + m), in the table is larger than 255, only

the least significant 8 bits are effective.

Data n

0 1 2 3 4 5 6 7 - 255 256 257 -

Column Address n n+1 n+2 n+3 n+4 n+5 n+6 n+7 - n+255 n n+1 -

2 words:

Burst Length

4 words:

8 words:

Full Page: Column address is repeated until terminated.

--- Addressing Sequence of Interleave Mode

A column access is started in the input column address and is performed by inverting the address

bits in the sequence shown in the following table.

Data n

Data 0

Data 1

Data 2

Data 3

Data 4

Data 5

Data 6

Data 7

Column Address

A7 A6 A5 A4 A3 A2 A1 A0

A7 A6 A5 A4 A3 A2 A1 A0#

A7 A6 A5 A4 A3 A2 A1# A0

A7 A6 A5 A4 A3 A2 A1# A0#

A7 A6 A5 A4 A3 A2# A1 A0

A7 A6 A5 A4 A3 A2# A1 A0#

A7 A6 A5 A4 A3 A2# A1# A0

A7 A6 A5 A4 A3 A2# A1# A0#

Burst Length

4 words

8 words

• CAS# Latency Field (A6~A4)

This field specifies the number of clock cycles from the assertion of the Read command to the first

read data. The minimum whole value of CAS# Latency depends on the frequency of CLK. The

minimum whole value satisfying the following formula must be programmed into this field.

tCAC(min) ≤ CAS# Latency X tCK

A6

A5

A4

CAS# Latency

0

0

0

Reserved

0

0

1

1 clock

0

1

0

2 clocks

0

1

1

3 clocks

1

X

X

Reserved

TM Technology Inc. reserves the right

P. 13

to change products or specifications without notice.

Publication Date: FEB. 2007

Revision: A

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