
Altera Corporation
5–87
April 2011
Stratix II Device Handbook, Volume 1
DC & Switching Characteristics
High-Speed I/O
Specifications
Table 5–88 provides high-speed timing specifications definitions.
Table 5–89 shows the high-speed I/O timing specifications for -3 speed
grade Stratix II devices.
Table 5–88. High-Speed Timing Specifications & Definitions
High-Speed Timing Specifications
Definitions
tC
High-speed receiver/transmitter input and output clock period.
fHSCLK
High-speed receiver/transmitter input and output clock frequency.
J
Deserialization factor (width of parallel data bus).
W
PLL multiplication factor.
tRISE
Low-to-high transmission time.
tFALL
High-to-low transmission time.
Timing unit interval (TUI)
The timing budget allowed for skew, propagation delays, and data
sampling window. (TUI = 1/(Receiver Input Clock Frequency ×
Multiplication Factor) = tC/w).
fHSDR
Maximum/minimum LVDS data transfer rate (fHSDR = 1/TUI), non-DPA.
fHSDRDPA
Maximum/minimum LVDS data transfer rate (fHSDRDPA = 1/TUI), DPA.
Channel-to-channel skew (TCCS)
The timing difference between the fastest and slowest output edges,
including tCO variation and clock skew. The clock is included in the TCCS
measurement.
Sampling window (SW)
The period of time during which the data must be valid in order to capture
it correctly. The setup and hold times determine the ideal strobe position
within the sampling window.
Input jitter
Peak-to-peak input jitter on high-speed PLLs.
Output jitter
Peak-to-peak output jitter on high-speed PLLs.
tDUTY
Duty cycle on high-speed transmitter output clock.
tLOCK
Lock time for high-speed transmitter and receiver PLLs.
Table 5–89. High-Speed I/O Specifications for -3 Speed Grade (Part 1 of 2)
Symbol
Conditions
-3 Speed Grade
Unit
Min
Typ
Max
fHSCLK (clock frequency)
fHSCLK = fHSDR / W
W = 2 to 32 (LVDS, HyperTransport technology)
16
520
MHz
W = 1 (SERDES bypass, LVDS only)
16
500
MHz
W = 1 (SERDES used, LVDS only)
150
717
MHz