Altera Stratix IV Device Handbook page 1143

1–60
Table 1–46. DLL Frequency Range Specifications for Stratix IV Devices (Part 2 of 2)
Frequency
–2/–2×
Mode
Speed Grade
4 240-350
5 290-430
6 360-540
7 470-700
Note to Table 1–46:
(1) Low indicates a 6-bit DQS delay setting; high indicates a 5-bit DQS delay setting.
Table 1–47
Table 1–47. DQS Phase Offset Delay Per Setting for Stratix IV Devices
Notes to
(1) The valid settings for phase offset are -64 to +63 for frequency modes 0 to 3 and -32 to +31 for frequency modes
(2) The typical value equals the average of the minimum and maximum values.
(3) The delay settings are linear, with a cumulative delay variation of 40 ps for all speed grades. For example, when
Table 1–48
Table 1–48. DQS Phase Shift Error Specification for DLL-Delayed Clock (t
Devices
Number of DQS Delay
Note to
(1) This error specification is the absolute maximum and minimum error. For example, skew on three DQS delay
Stratix IV Device Handbook
Volume 4: Device Datasheet and Addendum
Frequency Range (MHz)
–3
Speed Grade Speed Grade
240-320 240-290
290-380 290-360
360-450 360-450
470-630 470-590
lists the DQS phase offset delay per stage for Stratix IV devices.
Speed Grade
–2/–2×
–3
–4
Table 1–47:
4 to 6.
using a –2 speed grade and applying a 10 phase offset settings to a 90° phase shift at 400 MHz, the expected
average cumulative delay is [625 ps + (10 × 10.5 ps) ± 20 ps] = 730 ps ± 20 ps.
lists the DQS phase shift error for Stratix IV devices.
(1)
Buffer
1
2
3
4
Table 1–48:
buffers in a –2/–2x speed grade is ± 78 ps or ± 39 ps.
Chapter 1: DC and Switching Characteristics for Stratix IV Devices
Available Phase Shift
–4
30°, 60°, 90°, 120°
36°, 72°, 108°, 144°
45°, 90°, 135°, 180°
60°, 120°, 180°, 240°
Min
7
7
7
–2/–2X –3
Speed Grade Speed Grade
26 28
52 56
78 84
104 112
Switching Characteristics
Number of
DQS Delay Buffer
Delay
(1)
Mode
Chains
High 12
High 10
High 8
High 6
(1) (2) (3)
,
,
Max Unit
13 ps
15 ps
16 ps
) for Stratix IV
DQS_PSERR
–4
Unit
Speed Grade
30 ps
60 ps
90 ps
120 ps
September 2014 Altera Corporation