NT5SV16M8CT View Datasheet(PDF) - Nanya Technology

Part Name

Description

Manufacturer

NT5SV16M8CT

128Mb Synchronous DRAM

Nanya Technology 

NT5SV32M4CT

NT5SV16M8CT

NT5SV8M16CT

128Mb Synchronous DRAM

Bank Activate Command

In relation to the operation of a fast page mode DRAM, the Bank Activate command correlates to a falling RAS signal. The Bank

Activate command is issued by holding CAS and WE high with CS and RAS low at the rising edge of the clock. The Bank Select

address BS0 - BS1 is used to select the desired bank. The row address A0 - A11 is used to determine which row to activate in

the selected bank.

The Bank Activate command must be applied before any Read or Write operation can be executed. The delay from when the

Bank Activate command is applied to when the first read or write operation can begin must meet or exceed the RAS to CAS

delay time (tRCD). Once a bank has been activated it must be precharged before another Bank Activate command can be

applied to the same bank. The minimum time interval between successive Bank Activate commands to the same bank is deter-

mined by the RAS cycle time of the device (tRC). The minimum time interval between interleaved Bank Activate commands

(Bank A to Bank B and vice versa) is the Bank to Bank delay time (tRRD). The maximum time that each bank can be held active

is specified as tRAS(max).

Bank Activate Command Cycle

T0

T1

T2

CK

ADDRESS

Bank A

Row Addr.

R A S-CAS delay (tRCD)

COMMAND

: “H” or “L”

Bank A

Activate

NOP

NOP

(CAS Latency = 3, tRCD = 3)

T3

Tn

Tn+1

Tn+2

Tn+3

..........

Bank A

Col. Addr.

..........

Bank B

Row Addr.

Bank A

Row Addr.

R A S - R A S delay time (tRRD)

Write A

with Auto

Precharge

..........

Bank B

Activate

NOP

Bank A

Activate

RAS Cycle time ( tRC )

NOP

Bank Select

The Bank Select inputs, BS0 and BS1, determine the bank to be used during a Bank Activate, Precharge, Read, or Write oper-

ation.

Bank Selection Bits

BS0

BS1

0

0

1

0

0

1

1

1

Bank

Bank 0

Bank 1

Bank 2

Bank 3

REV 1.0

May, 2001

9

© NANYA TECHNOLOGY CORP. All rights reserved.

NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.

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