EP2S15 ALTERA [Altera Corporation], EP2S15 Datasheet - Page 231

• Manufacturer Part Number: EP2S15
• Description: Stratix II Device Family
• Manufacturer: ALTERA [Altera Corporation]

Altera Corporation
May 2007
Note to
(1)
(2)
Number of DQS Delay Buffer Stages
Table 5–98. DQS Phase-Shift Error Specifications for DLL-Delayed Clock (tDQS_PSERR)
This error specification is the absolute maximum and minimum error. For example, skew on three delay buffer
stages in a C3 speed grade is 75 ps or ± 37.5 ps
Delay stages used for requested DQS phase shift are reported in your project’s Compilation Report in the
Quartus II software.
Table
5–98:
1
2
3
4
Notes to
(1)
(2)
Note to
(1)
Table 5–97. DQS Phase Jitter Specifications for DLL-Delayed Clock
(tDQS PHASE_JITTER)
Table 5–99. DQS Bus Clock Skew Adder Specifications
(tDQS_CLOCK_SKEW_ADDER)
Number of DQS Delay
Peak-to-peak phase jitter on the phase shifted DDS clock (digital jitter is caused
by DLL tracking).
Delay stages used for requested DQS phase shift are reported in your project’s
Compilation Report in the Quartus II software.
This skew specification is the absolute maximum and minimum skew. For
example, skew on a ×4 DQ group is 40 ps or ±20 ps.
Buffer Stages
×18 DQ per DQS
×36 DQ per DQS
×4 DQ per DQS
×9 DQ per DQS
(2)
Table
Table
Mode
–3 Speed Grade
1
2
3
4
5–99:
5–97:
.
100
25
50
75
(2)
Note (1)
–4 Speed Grade
DQS Phase Jitter
DQS Clock Skew Adder
120
30
60
90
120
30
60
90
Stratix II Device Handbook, Volume 1
40
70
75
95
DC & Switching Characteristics
–5 Speed Grade
105
140
35
70
Unit
ps
ps
ps
ps
(1)
Unit
ps
ps
ps
ps
Unit
ps
ps
ps
ps
5–95