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Yongfeng- > I have design a board with C5409. It works well with the emulator. But > after I burn the program into the on-board flash, it couldn't boot from > the parallel flash every time powered up.About one out of ten times it > can load program and work well. Can you explain why: The power > supply,the reset? Also, check the archives for exchanges about C54xx bootloader; there have been several over a few years. If you don't do exactly the right thing with INT2, XF flag, etc. the bootloader ROM can become confused as to where is the boot source. The bootloader supports HPI, McBSP, EMIF and I/O, etc. so you must be careful that the chip always correctly recognizes your supply and does not inadvertently go into one of the other modes. Jeff Brower system engineer Signalogic Vinodh Rathna N wrote: > > Date: Fri, 20 Jun 2003 20:48:43 +0800 > From: <> > Subject: To boot the C5409 > > Hi! > I have design a board with C5409. It works well with the emulator. But > after I burn the program into the on-board flash, it couldn't boot from > the parallel flash every time powered up.About one out of ten times it > can load program and work well. Can you explain why: The power > supply,the reset? > Ma Yongfeng > REPLY > > U have to check the reset chip u are using. A power supervisor like > TPs3305 is a must to give a proper reset both to the ic and the external > memory chip. > U need to monitor the MSTRB/ signal on power on that will give u some > clue... > > All the best > > regards > > Vinodh Rathna > Firmware Engineer > EmSyS ( Design House for Embedded Systems) > LARSEN AND TOUBRO MYSORE > INDIA |