ep1sgx25d Altera Corporation, ep1sgx25d Datasheet - Page 55

• Manufacturer Part Number: ep1sgx25d
• Description: Stratix Gx Device Family Data Sheet
• Manufacturer: Altera Corporation

Figure 3–5. Source-Synchronous DPA Circuitry
Note to
(1)
Altera Corporation
August 2005
Both deserializers are identical. The deserializer operation is described in the
section.
Figure
rx_inclock_p
rx_inclock_n
3–5:
rx_in+
rx_in-
Receiver Circuit
DPA Block Overview
Each Stratix GX receiver channel features a DPA block. The block contains
a dynamic phase selector for phase detection and selection, a SERDES, a
synchronizer, and a data realigner circuit. You can bypass the dynamic
phase aligner without affecting the basic source-synchronous operation
of the channel by using a separate deserializer shown in
The dynamic phase aligner uses both the source clock and the serial data.
The dynamic phase aligner automatically and continuously tracks
fluctuations caused by system variations and self-adjusts to eliminate the
phase skew between the multiplied clock and the serial data.
shows the relationship between Stratix GX source-synchronous circuitry
and the Stratix GX source-synchronous circuitry with DPA.
PLL
×W
8
×1
Dynamic
Aligner
Phase
Deserializer
Deserializer (1)
(1)
Source-Synchronous Signaling With DPA
Stratix GX Device Handbook, Volume 1
“Principles of SERDES Operation”
Stratix GX
Logic
Array
Figure
Figure 3–5
3–5.
3–5