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HYB18L256169BF Datasheet, PDF (32/48 Pages) Qimonda AG – 256-Mbit Mobile-RAM
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HY[B/E]18L256169BF-7.5
256-Mbit Mobile-RAM
Functional Description
2.4.8.2 CONCURRENT AUTO PRECHARGE
A READ or WRITE burst with Auto Precharge enabled can be interrupted by a subsequent READ or WRITE
command issued to a different bank.
Figure 37 shows a READ with Auto Precharge to bank n, interrupted by a READ (with or without Auto Precharge)
to bank m. The READ to bank m will interrupt the READ to bank n, CAS latency later. The precharge to bank n
will begin when the READ to bank m is registered.
Figure 38 shows a READ with Auto Precharge to bank n, interrupted by a WRITE (with or without Auto Precharge)
to bank m. The precharge to bank n will begin when the WRITE to bank m is registered. DQM should be pulled
HIGH two clock cycles prior to the WRITE to prevent bus contention.
Figure 39 shows a WRITE with Auto Precharge to bank n, interrupted by a READ (with or without Auto Precharge)
to bank m. The precharge to bank n will begin tWR after the new command to bank m is registered. The last valid
data-in to bank n is one clock cycle prior to the READ to bank m.
Figure 40 shows a WRITE with Auto Precharge to bank n, interrupted by a WRITE (with or without Auto
Precharge) to bank m. The precharge to bank n will begin tWR after the WRITE to bank m is registered. The last
valid data-in to bank n is one clock cycle prior to the WRITE to bank m.
#, +
#OM MA ND ./ 0
!DDRE SS
$1
2$ !0
"#A ONLKBN
./ 0
#, 
2% !$
./ 0
./ 0
./ 0
./ 0
"#A NO KLXM
$/ B
T2 0BA NKN
$/ B  $/ X
$/ X  $/ X 
2$ ! 02EA DWITH!UTO0RECHA RGE2%! $  2EA DWITHORWITHO UT!UTO0RECHA RGE
#,  AND "URS T,EN GTHINTH ECASE SHOWN
2E ADWITH! UTO0REC HARGETOBAN KNIS IN TERRUP TEDBYSUB SEQ UENT2E ADTOB ANKM
$O NgT#A RE
Figure 37 READ with Auto Precharge Interrupted by READ
#, +
#OM MA ND ./ 0
!DDRE SS
$1-
$1
2$ !0
"A NKN
#O LB
./ 0
#, 
./ 0
72 )4%
"A NKM
#O LX
./ 0
./ 0
./ 0
$/ B
$)X
T2 0BA NKN
$)X  $)X 
$)X 
2$ !0 2E ADWITH!UTO0RECHA RGE72)4% 7RITE WITHORWITH OUT!UTO0 RECHARG E
#,  AND "URS T,EN GTHINTH ECASE SHOWN
2E ADWITH! UTO0REC HARGETOBAN KNIS IN TERRUP TEDBYSUBSEQ UENT7RITETOBANK M
Figure 38 READ with Auto Precharge Interrupted by WRITE
$O NgT#A RE
Data Sheet
32
Rev. 1.02, 2006-12
02032006-MP0M-7FQG
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