IS42S32200C1-6T 查看數據表（PDF） - Integrated Silicon Solution

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IS42S32200C1-6T

512K Bits x 32 Bits x 4 Banks (64-MBIT) SYNCHRONOUS DYNAMIC RAM

Integrated Silicon Solution 

IS42S32200C1

CAS Latency

The CAS latency is the delay, in clock cycles, between the

registration of a READ command and the availability of the first

piece of output data. The latency can be set to two or three clocks.

If a READ command is registered at clock edge n, and the

latency is m clocks, the data will be available by clock

edge n + m. The DQs will start driving as a result of the

clock edge one cycle earlier (n + m - 1), and provided that

the relevant access times are met, the data will be valid

by clock edge n + m. For example, assuming that the

clock cycle time is such that all relevant access times are

met, if a READ command is registered at T0 and the

latency is programmed to two clocks, the DQs will start

driving after T1 and the data will be valid by T2, as shown

in CAS Latency diagrams. The Allowable Operating

Frequency table indicates the operating frequencies at

which each CAS latency setting can be used.

Reserved states should not be used as unknown operation

or incompatibility with future versions may result.

Operating Mode

The normal operating mode is selected by setting M7 and M8

to zero; the other combinations of values for M7 and M8 are

reserved for future use and/or test modes. The programmed

burst length applies to both READ and WRITE bursts.

Test modes and reserved states should not be used

because unknown operation or incompatibility with future

versions may result.

Write Burst Mode

When M9 = 0, the burst length programmed via M0-M2

applies to both READ and WRITE bursts; when M9 = 1, the

programmed burst length applies to READ bursts, but

write accesses are single-location (nonburst) accesses.

CAS Latency

Allowable Operating Frequency (MHz)

Speed

CAS Latency = 2

CAS Latency = 3

5.5

100

183

6

100

166

7

100

143

CAS Latency

T0

T1

T2

T3

CLK

COMMAND

DQ

READ

NOP

NOP

tAC

DOUT

tLZ

tOH

CAS Latency - 2

T0

T1

T2

T3

T4

CLK

COMMAND READ

DQ

NOP

NOP

tAC

tLZ

CAS Latency - 3

NOP

DOUT

tOH

DON'T CARE

UNDEFINED

16

Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774

Rev. B

1/18/07

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