Hi all, We are trying to programme a FLASH memory linked to a APA1000. However, we have a data-blaster that should programme the FLASH quickly, providing we can drive the write signal from teh APA to a high imedance state via the JTAG port. It seems we're having trouble doing this. Is it possible to force/ drive a particular pin to 'Z' via JTAG? The data-blaster write is driven through a buffer which is enabled only when the appropriate APA pin is driven to a '1' rather than '0', but the buffer o/p conflicts with the APA write signal unless we can tri-state that. TIA, Niv.
Actel APA1000 and JTAG
Started by ●August 17, 2007
Reply by ●August 17, 20072007-08-17
On 17 Aug., 13:42, Niv <kev.pars...@mbda.co.uk> wrote:> Hi all, > We are trying to programme a FLASH memory linked to a APA1000. > However, we have a data-blaster that should programme the FLASH > quickly, providing we can drive the write signal from teh APA to a > high imedance state via the JTAG port. > > It seems we're having trouble doing this. Is it possible to force/ > drive a particular pin to 'Z' via JTAG? > > The data-blaster write is driven through a buffer which is enabled > only when the appropriate APA pin is driven to a '1' rather than '0', > but the buffer o/p conflicts with the APA write signal unless we can > tri-state that. > > TIA, Niv.always check the BSDL Files !!! "HIGHZ (00000111), "& Antti Lukats prelim docu about actel undoc http://docs.google.com/Doc?docid=ddn2thkw_36f29b7c
Reply by ●August 17, 20072007-08-17
On Aug 17, 2:42 pm, Niv <kev.pars...@mbda.co.uk> wrote:> It seems we're having trouble doing this. Is it possible to force/ > drive a particular pin to 'Z' via JTAG?You can use boundary-scan software for this purpose. I would recommend Scanseer http://www.scanseer.com. Put chip in EXTEST state and force any pin to any value you want.
