Internet Data Sheet
HYB18H1G321AF–10/11/14
1-Gbit GDDR3
Parameter
CAS
latency
Symbo
l
Limit Values
–11
Unit Note
–10
-14
min
max
min
max
min
max
10)
11)
Internal write to Read Command
Delay (different rank)
tWTR_RR
tWTW_RR
—
—
BL/2 – 1
—
BL/2 – 1
—
tCK
tCK
Write to Write Command Delay
(different rank)
—
—
BL/2
2
—
—
BL/2
2
—
—
12)
11)
Read to Write command delay
tRTW
t
RTW(min) = CL + BL/2+ 2 – WL
tCK
tCK
Read to Read Command Delay
(different rank)
tRTR_RR
—
—
Write Cycle Timing Parameters for Data and Data Strobe
Write command to first WDQS
latching transition
tDQSS
WL–0.25 WL+0.25 WL–0.25 WL+0.25 WL–0.25 WL+0.25 tCK
Data-in and Data Mask to WDQS tDS
Setup Time
0.14
0.14
0.40
—
—
—
0.15
0.15
0.40
—
—
—
0.18
0.18
0.40
—
—
—
ns
ns
tCK
Data-in and Data Mask to WDQS tDH
Hold Time
Data-in and DM input pulse width tDIPW
(each input)
DQS input low pulse width
DQS input high pulse width
DQS Write Preamble Time
DQS Write Postamble Time
Write Recovery Time
tDQSL
tDQSH
tWPRE
tWPST
tWR
0.40
0.40
0.75
0.75
13
—
0.40
0.40
0.75
0.75
13
—
0.40
0.40
0.75
0.75
10
—
tCK
tCK
tCK
tCK
tCK
—
—
—
1.25
1.25
—
1.25
1.25
—
1.25
1.25
—
9)
3)
Read Cycle Timing Parameters for Data and Data Strobe
Data Access Time from Clock
Read Preamble
tAC
– 0.21
0.75
0.21
1.25
1.25
tACmax
– 0.22
0.75
0.22
1.25
1.25
tACmax
– 0.25
0.75
0.25
1.25
1.25
tACmax
ns
tCK
tCK
ns
tRPRE
tRPST
Read Postamble
0.75
0.75
0.75
Data-out high impedance time from tHZ
tACmin
tACmin
tACmin
CLK
Data-out low impedance time from tLZ
tACmin
tACmax
tACmin
tACmax
tACmin
tACmax
ns
CLK
DQS edge to Clock edge skew
tDQSCK –0.21
0.21
–0.22
—
0.22
–0.25
—
0.25
ns
ns
13)
DQS edge to output data edge
skew
tDQSQ
—
0.120
0.130
0.160
Data hold skew factor
tQHS
tQH
—
0.120
32
—
0.130
—
0.160
32
ns
ns
Data output hold time from DQS
Refresh/Power Down Timing
Refresh Period (8192 cycles)
tHP – tQHS
tREF
—
—
32
—
ms
µs
Average periodic Auto Refresh
interval
tREFI
3.9
3.9
3.9
Delay from AREF to next ACT/
AREF
tRFC
tXSC
52.0
—
—
52.0
—
—
59
—
—
ns
Self Refresh Exit time
1000
1000
1000
tCK
Rev. 0.92, 2007-10
40
06122007-MW7D-3G3M
QIMONDA [ QIMONDA AG ]
