EP4SE230F29I4N Datasheet, PDF (68/82 Pages) Altera Corporation – Stratix IV Device Handbook

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