i have a problem with sst39vf800a

By: teknobakis - 2008-07-01 07:26:16

i can't get valid device id. i am using 4.5 tsop48 board. when i select 29lv160 from chip select menu vaid device code and manufacturer id ok, but not programming.

Re: i have a problem with sst39vf800a

By: DL - 2008-07-01 15:21:48

Hi,

What adapter are you using?  That device is word wide only and requires a 16 bit adapter.  No on-board TSOP48 socket will work.

Why are you selecting 29LV160?  That's a 16Mb device being operated in it's byte-wide mode.

HTH,
Dennis

Re: i have a problem with sst39vf800a

By: teknobakis - 2008-07-01 16:24:57

i am using on-board tsop48 adapter. How to program this chip, please give me to step-to-step programming instructions including 16 bit tsop-48 connection.

Thanks..

Re: i have a problem with sst39vf800a

By: DL - 2008-07-01 16:49:35

Emrah AYDIN wrote on 07/01/08 at 16:24:57:
i am using on-board tsop48 adapter.
AFAIK, all Willem type programmers with on-board TSOP48 sockets only support byte wide devices or word wide devices that support a byte mode.
Quote:
How to program this chip, please give me to step-to-step programming instructions including 16 bit tsop-48 connection.
I don't have SST39VF800A or a 16 bit adapter, so I can only give general directions.

The only 16 bit TSOP48 adapter I'm aware of is from Sivava.com.  They have an all-in-one adapter that supports all TSOP devices.  Connection to your programmer will probably require a custom cable.

The correct device is FLASH 16 bit (LV) -> SST39LF/VFx00 -> 39LF/VF800A.  It's a low voltage device, so VCC needs to be set to 3.6V.  Willem 4.5 (this is what I think you have) has a low voltage option, but you shouldn't set it below 3.6V because the programmer doesn't have a level shifter for driving the parallel port at 5V (or being driven at 5V when operating at low voltage).  The Sivava adapter probably has diodes that reduce VCC to the device.  This is a bad idea because the device you're programming will have it's inputs overdriven by 2 diode drops and that can cause problems with electromigration.  The other problem is that the device will be underdriving programmer inputs so you can have timing problems.  So just short the diodes and run the programmer and device at 3.6V.

HTH,
Dennis

Re: i have a problem with sst39vf800a

By: teknobakis - 2008-07-02 06:49:36

Thank you dennis...