Article ID: 000082076 Content Type: Product Information & Documentation Last Reviewed: 11/25/2013

How can I make parallel On Chip Termination assignment to the CQ and CQn bi-directional pins of the Legacy QDRII SRAM Controller in Stratix II devices?

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BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

In Stratix® II device legacy QDRII SRAM Controller, CQ pins are coded as bi-directional pins. Parallel On Chip Termination (OCT) is not supported by bi-directional pins in Stratix II devices.

To assign parallel OCT to the CQ and CQn pins, you will need to change the CQ and CQn stratixii_io WYSIWYGs in the datapath to have operation_mode set to "input" instead of bidir, and delete any register-related, output-related, and oe-related parameters (like ddio_mode, output_register_mode, oe_register_mode, etc). You should be able to find them in the HDL file <variation_name>_auk_qdrii_sram_cq_cqn_group.v/.vhd named "cq_inst" and "cqn_inst".

Once you make the pin input instead of bi-directional, you will be able to assign parallel OCT to it.

You will have to make the above mentioned changes to the code everytime you regenerate the core.

Related Products

This article applies to 2 products

Stratix® II GX FPGA
Stratix® II FPGAs

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