EP2AGX65DF29I5N Altera, EP2AGX65DF29I5N Datasheet - Page 132

• Manufacturer Part Number: EP2AGX65DF29I5N
• Description: IC ARRIA II GX FPGA 65K 780FBGA
• Manufacturer: Altera
• Series: Arria II GXr

Specifications of EP2AGX65DF29I5N

• Number Of Logic Elements/cells: 60214
• Number Of Labs/clbs: 2530
• Total Ram Bits: 5246
• Number Of I /o: 364
• Voltage - Supply: 0.87 V ~ 0.93 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 780-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

5–28
Arria II Device Handbook Volume 1: Device Interfaces and Integration
Source-Synchronous Mode for LVDS Compensation
The goal of source-synchronous mode for LVDS compensation is to maintain the same
data and clock timing relationship seen at the pins at the internal
serializer/deserializer (SERDES) capture register, except that the clock is inverted
(180° phase shift), as shown in
the delay of the LVDS clock network plus any difference in the delay between these
two paths:
■
■
Figure 5–21. Source-Synchronous Mode for LVDS Compensation for Arria II Devices
No-Compensation Mode
In no-compensation mode, the PLL does not compensate for the clock networks. This
mode provides better jitter performance because the clock feedback into the PFD
passes through less circuitry. Both the PLL internal and external clock outputs are
phase-shifted with respect to the PLL clock input.
waveform of the PLL clocks’ phase relationship in no-compensation mode.
Data pin-to-SERDES capture register
Clock input pin-to-SERDES capture register. In addition, the output counter must
provide the 180° phase shift.
Clock at register
Data at register
reference clock
at input pin
Data pin
PLL
Figure
5–21. Thus, this mode ideally compensates for
Chapter 5: Clock Networks and PLLs in Arria II Devices
Figure 5–22
December 2010 Altera Corporation
shows an example
PLLs in Arria II Devices