# Do I have all information?
**URL:** https://forums.digi.com/t/do-i-have-all-information/4706
**Category:** NET+OS
**Created:** [June 3, 2003, 4:16pm UTC](https://forums.digi.com/t/do-i-have-all-information/4706 "2003-06-03T16:16:57Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@system](https://forums.digi.com/u/system)
#### Post date: [June 3, 2003, 4:16pm UTC](https://forums.digi.com/t/do-i-have-all-information/4706/1 "2003-06-03T16:16:57Z")
I just began the design of a system based on the NS7520. I intend to use a 32bit 128Mbit SDRAM and a 16bit 16MBit flash memory. After searching for reference designs and always watching on the dev kit schematic, i think there’s some imformation missing. In this forum i read the first time, that 16bit devices should be attached to D16:31 instead of D00:15, which would be normally assumed (Forum text: for 16 bit device use D16-D31 (HW manual page 1-15). Unused D0-D15 should be pulled up with 10k resistors). I have a NS7520 data sheet, a NS7520 Hardware Reference and a NS7520 Jumpers and Components Guide of the dev kit. What is ment with “HW manual”? I searched all of your webpage and every CD coming with the dev kit. I would appreciate any hint, where I can get additional information about attaching devices to busses and/or a reference design of a simple architecture with as few components as possible. Thanks Christian
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### Author:  [@waster](https://forums.digi.com/u/waster)
#### Post date: [June 3, 2003, 7:01pm UTC](https://forums.digi.com/t/do-i-have-all-information/4706/2 "2003-06-03T19:01:29Z")
I think this is a reference to the old Net+50 manual (document INTERNATIONAL) which talks about the data bus and port sizes in section 1 around about page 15… and the section probably did the same in the Net+40 manual as well… Either way the talk about pull ups I think is misleading as I believe it only applies to the devices before the NET+50 (and only then in reference to address lines I think?)… i.e. after the NET+50 these external pullups are not required. As for info/reference designs on hooking up memory to these chips… there isn’t much available… That old manual has some stuff and the new one (for the NET+50) has some info in the memory controller section… Other than that its the reference schematics for the dev kits… Regards, Dave
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### Author:  [@waster](https://forums.digi.com/u/waster)
#### Post date: [June 3, 2003, 7:03pm UTC](https://forums.digi.com/t/do-i-have-all-information/4706/3 "2003-06-03T19:03:32Z")
That should have been 8833242A dated June 2001 and not INTERNATIONAL… why the spell check thought that was the word… and why I pressed change I have no idea 😉
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### Author:  [@system](https://forums.digi.com/u/system)
#### Post date: [June 4, 2003, 11:05am UTC](https://forums.digi.com/t/do-i-have-all-information/4706/4 "2003-06-04T11:05:37Z")
Thank you! The Net+50 has also been changed and obviously these parts have been removed. In the Net+15/+40-Manual I found the mentioned chapter and I hope, I can use most of the information for the NS7520. Anyway, I would be happy if Netsilicon would provide a reference design with parts, that almost everyone has to implement into a new design (32Bit or 16+16Bit SDRAM, 16Bit or 16+16Bit Flash, Phy).
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### Author:  [@waster](https://forums.digi.com/u/waster)
#### Post date: [June 4, 2003, 11:38am UTC](https://forums.digi.com/t/do-i-have-all-information/4706/5 "2003-06-04T11:38:17Z")
Hi Christian If you want a 16+16 bit SDRAM + 16 bit Flash references design (admittedly using a NET+50) then FS Forth-Systeme does a devboard that has a robust memory interface providing 64Mb CAS2 SDRAM (2 \* 16bit \* 2M) and 8Mb of Flash (16bit \* 4M). See if you can get hold of the schematic (Modnet50 rev 2)from their web site… and I think they also do a NS7520 dev board as well… [www.fsforth.de](http://www.fsforth.de) Regards, Dave