I am dealing with the pin assignments specifications for
Altera's Cyclone IV FPGA. I am using Altera's Quartus II software and
using its QSYS tool I have designed a system to interface DDR2 SDRAM
with FPGA. While I was assigning pin assignments to FPGA. I came across
the feature - On-chip termination, which fascinated me as it can deduct
the requirement of adding pull-up resistors and can reduce the bulkiness
of the board.
As all the pins from FPGA to SDRAM are output or bi-directional,
I have applied output termination with series 50 ohms with calibration
to all the pins. My questions are-
1.Is my attempt of applying output termination, with series 50
ohms calibration, to bi-directional pins correct?
(I have read that
For input pins, input termination should be used with parallel
For output pins output termination should be used with series
For bi-directional both the input and output termination or
dynamic termination should be used.
But in Cyclone IV input termination and dynamic termination
options are not available. These options are there in Stratix family
2. If output termination with series 5o ohm with calibration is
correct, do I need to add any external resistors for termination on FPGA
side?(Except RUP and RDN resistors)