EP1SGX10DF672C6 Datasheet, PDF (61/272 Pages) Altera Corporation – Section I. Stratix GX Device Family Data Sheet

Source-Synchronous Signaling With DPA
Figure 3–9. Fast PLL Clocks & Data Input
Data input
D0
D1
D2
D3
D4
D5
Dn
Clock A
Clock B
Clock C
Clock D
Clock A'
Clock B'
Clock C'
Clock D'
Protocols, Training Pattern & DPA Lock Time
The dynamic phase aligner uses a fast PLL for clock multiplication, and
the dynamic phase selector for the phase detection and alignment. The
dynamic phase aligner uses the high-speed clock out of the dynamic
phase selector to deserialize high-speed data and the receiver's source
synchronous operations.
At each rising edge of the clock, the dynamic phase selector determines
the phase difference between the clock and the data and automatically
compensates for the phase difference between the data and clock.
Altera Corporation
August 2005
3–11
Stratix GX Device Handbook, Volume 1