Article ID: 000085614 Content Type: Troubleshooting Last Reviewed: 01/01/2015

Can I use a configuration device's nCASC signal in a single-device configuration scheme?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

The nCASC pin is used to cascade configuration devices to configure large APEXTM and FLEXTM devices. The nCASC pin is driven low when the configuration device's internal address counter reaches its maximum value (when the last bit of the configuration data is sent to the APEX or FLEX device). The internal address counter can only be incremented by the DCLK signal when the nCS pin is low. If you only use one configuration device, the nCS pin is pulled high by the CONF_DONE signal before the device's internal address counter reaches its maximum value. In this case, the nCASC pin is not driven low.

 

To tell when configuration is complete, see the conf_done or init_done pin of the FLEX or APEX device.

 For more information on all configuration signals, refer to the Configuration Handbook.

Related Products

This article applies to 2 products

Acex® 1K
Excalibur™

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