# About Databus and Addressbus.

**URL:** <https://forums.digi.com/t/about-databus-and-addressbus/4714>\
**Category:** NET+OS\
**Created:** [April 10, 2003, 8:16am UTC](https://forums.digi.com/t/about-databus-and-addressbus/4714 "2003-04-10T08:16:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/digi/original/1X/11da31a6a1fbcd03ef21d3f785c317c824009ae2.png) [@system](https://forums.digi.com/u/system)\
**Post date:** [April 10, 2003, 8:16am UTC](https://forums.digi.com/t/about-databus-and-addressbus/4714/1 "2003-04-10T08:16:07Z")

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My board is NS7520 development board. I could not find any pullup and pulldown on the DataBus(also,AddressBus). I wonder whether I have to design pullup or pulldown on Bus Interfaces.(except for bootstrap) Dose the NS7520 have internal pullup or pulldown on Bus Interfaces ?

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/digi/original/1X/11da31a6a1fbcd03ef21d3f785c317c824009ae2.png) [@system](https://forums.digi.com/u/system)\
**Post date:** [April 29, 2003, 8:40pm UTC](https://forums.digi.com/t/about-databus-and-addressbus/4714/2 "2003-04-29T20:40:10Z")

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All address lines do have an internal pullups