HY[B/E]18L256160B[C/F]X-7.5
256-Mbit Mobile-RAM
Functional Description
2.4.5.1
READ Burst Termination
Data from any READ burst may be truncated using the BURST TERMINATE command (see Page 30), provided
that Auto Precharge was not activated. The BURST TERMINATE latency is equal to the CAS latency, i.e. the
BURST TERMINATE command must be issued x clock cycles before the clock edge at which the last desired data
element is valid, where x equals the CAS latency for READ bursts minus 1. This is shown in Figure 18. The
BURST TERMINATE command may be used to terminate a full-page READ which does not self-terminate.
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BURST IS TERMINATE AFTER THE ꢆR ATA ELEMENTꢐ
Figure 18 Terminating a READ Burst
2.4.5.2
Clock Suspend Mode for READ Cycles
Clock suspend mode allows to extend any read burst in progress by a variable number of clock cycles. As long as
CKE is registered LOW, the following internal clock pulse(s) will be ignored and data on DQ will remain driven, as
shown in Figure 19.
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INTERNAL
CLOCK
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$/ N ETCꢐ ꢒ $ATA /UT FROM COLUMN N ETCꢐ
#, ꢒ ꢁ IN THE CASE SHOWN
#LOCK SUSPEN LATENCY T#3, IS ꢀ CLOCK CYCLE
Figure 19 Clock Suspend Mode for READ Bursts
Data Sheet
21
Rev. 1.11, 2007-01
07142005-CR47-RB2E
QIMONDA [ QIMONDA AG ]
