# External device on white connector

**URL:** <https://forums.digi.com/t/external-device-on-white-connector/5218>\
**Category:** NET+OS\
**Created:** [February 26, 2003, 1:43am UTC](https://forums.digi.com/t/external-device-on-white-connector/5218 "2003-02-26T01:43:09Z")\
**Posts on this page:** 4\
**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:** [February 26, 2003, 1:43am UTC](https://forums.digi.com/t/external-device-on-white-connector/5218/1 "2003-02-26T01:43:09Z")

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Hi all, I’m using NET+OS5.0 and Rev B NET+50 development board. I’m trying to connect exrternal peripheral to white 96pin connector(J14). Connected device will works as a SRAM. So, to assign peripheral to CS4, I adding the code to ncc\_init() in ncc\_init.c. The codes for initialize are… (\*NCC\_MEM).cs4.csor.reg = 0xffffe208; (\*NCC\_MEM).cs4.csar.reg = 0x03800001; When I debugging with above initialization code, sample application works normally regardless of connect peripheral or not. And I make a API for external device, based on NVRAM API. However it doesn’t works correctly. (ex: when I write data some offset, same data can be read on another offset too) I know it may caused some bugs of external device. Then, we check out pin195(CS4) on NET+50 but there’s no any signal outed despite of accessing on code. Is anybody connect SRAM like peripheral on white connector? If so, how do you control(write/read) that? Please teach me anything you knows about above. Thanks.

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**Author:** ![shatman](https://avatars.discourse-cdn.com/v4/letter/s/46a35a/32.png) [@shatman](https://forums.digi.com/u/shatman)\
**Post date:** [February 26, 2003, 2:24pm UTC](https://forums.digi.com/t/external-device-on-white-connector/5218/2 "2003-02-26T14:24:24Z")

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Have you checked that the jumper JP14 is connected between pins 2 & 3 ?

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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:** [February 27, 2003, 7:47am UTC](https://forums.digi.com/t/external-device-on-white-connector/5218/3 "2003-02-27T07:47:31Z")

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reconfirmed you for your reply. Your mentioned point is already changed before I post message and reconfirmed after your reply. There’s all right. thanks again. And then, please give me a more suggestion or information. Regards.

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**Author:** ![muscleman](https://avatars.discourse-cdn.com/v4/letter/m/f1d935/32.png) [@muscleman](https://forums.digi.com/u/muscleman)\
**Post date:** [March 18, 2003, 5:12pm UTC](https://forums.digi.com/t/external-device-on-white-connector/5218/4 "2003-03-18T17:12:25Z")

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The most important thing is that how you are accessing the CS4 locations? Because the set up for CS4\* memory space = 3800000 to 38FFFFF should be OK provided with 2 wait states, no burst, 8-bit data bus.