HYB18H256321BF Datasheet, PDF (33/41 Pages) Qimonda AG – 256-Mbit GDDR3 Graphics RAM GDDR3 Graphics RAM

Internet Data Sheet
4.11
AC Timings for HYB18H256321BF
HYB18H256321BF
256-Mbit GDDR3
Parameter
CAS latency
Symbol Limit Values
TABLE 19
Timing Parameters for HYB18H256321BF
Unit Note
–10
–11
–12
–14
Min. Max. Min. Max. Min. Max. Min. Max.
Clock and Clock Enable
System frequency CL=13
f_CK13
—
CL= 12
f_CK12
TBD
CL= 11
f_CK11
400
CL =10
f_CK10
400
CL = 9
f_CK9
400
CL = 8
f_CK8
400
CL = 7
f_CK7
400
Clock high level width
t_CH
0.45
Clock low-level width
t_CL
0.45
Minimum clock half period
t_HP
0.45
Command and Address Setup and Hold Timing
—
1000
900
800
700
600
550
0.55
0.55
—
—
—
400
400
400
400
400
0.45
0.45
0.45
—
—
900
800
700
600
550
0.55
0.55
—
——
——
400 800
400 700
400 650
400 550
400 500
0.45 0.55
0.45 0.55
0.45 —
—
—
400
400
400
400
400
0.45
0.45
0.45
—
—
700
650
600
500
450
0.55
0.55
—
Address/Command input setup time
t_IS
Address/Command input hold time
t_IH
Address/Command input pulse width
t_IP
Mode Register Set Timing
0.24 —
0.24 —
0.7 —
0.27 —
0.27 —
0.7 —
0.3 —
0.3 —
0.7 —
0.35 —
0.35 —
0.7 —
Mode Register Set cycle time
Mode Register Set to READ timing
Row Timing
t_MRD
6
—6
—6
—6
—
t_MRDR 12 —
12 —
12 —
12
—
Row Cycle Time
Row Active Time
ACT(a) to ACT(b) Command period
Row Precharge Time
Row to Column Delay Time for Reads
Row to Column Delay Time for Writes
Column Timing
t_RC
t_RAS
t_RRD
t_RP
t_RCDRD
t_RCDWR
37 — 35 — 34 — 30 —
23 — 22 — 21 — 18 —
9
—8
—8
—7
—
14 — 13 — 13 — 12 —
13 — 12 — 12 — 11 —
t_RCDWR(Min) = max(t_RCDRD(Min) - (WL + 1) × t_CK;2×t_CK)
CAS(a) to CAS(b) Command period
t_CCD
2
—2
—2
—2
—
Write to Read Command Delay
t_WTR
7
—6
—6
—5
—
Read to Write command delay
t_RTW
t_RTW(min)= (CL + BL/2 +2 -WL)
Write Cycle Timing Parameters for Data and Data Strobe
Write command to first WDQS latching t_DQSS
transition
WL– WL+ WL– WL+ WL– WL+ WL– WL+
0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25
MHz
MHz ¹⁾
MHz ²⁾
MHz ¹⁾
MHz ¹⁾
MHz ¹⁾
MHz ¹⁾
t_CK
t_CK
t_CK ³⁾
ns
ns
t_CK
t_CK
4)5)
t_CK ³⁾
t_CK
t_CK ⁶⁾
t_CK
t_CK
t_CK
t_CK ⁷⁾
t_CK ⁸⁾
t_CK ⁹⁾
t_CK
10)
t_CK
Rev. 0.80, 2007-09
33
09132007-07EM-7OYI