UPD4564323 データシートの表示（PDF） - NEC => Renesas Technology

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UPD4564323

64M-bit Synchronous DRAM 4-bank, LVTTL

NEC => Renesas Technology 

µPD4564323 for Rev. E

12.2 Precharge Termination

12.2.1 Precharge Termination in READ Cycle

During a read cycle, the burst read operation is terminated by a precharge command.

When the precharge command is issued, the burst read operation is terminated and precharge starts.

The same bank can be activated again after tRP from the precharge command.

To issue a precharge command, tRAS must be satisfied.

When /CAS latency is 2, the read data will remain valid until one clock after the precharge command.

Burst length = X, /CAS latency = 2

T0

T1

T2

T3

T4

T5

T6

T7

CLK

Command

Read

PRE

ACT

Hi-Z

DQ

Q1

Q2

Q3

Q4

tRP

(tRAS must be satisfied)

When /CAS latency is 3, the read data will remain valid until two clocks after the precharge command.

Burst length = X, /CAS latency = 3

T0

T1

T2

T3

T4

T5

T6

T7

T8

CLK

Command

Read

PRE

ACT

Hi-Z

DQ

Q1

Q2

Q3

Q4

tRP

(tRAS must be satisfied)

30

Data Sheet M14376EJ2V0DS00

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