Jean- > Thx for the response. I havn't had the opportunity to test the board > with the 19.2MHz oscillator (awaiting the components). > > Just to confirm: Besides the timing issues, there are no hardware > differences between the C5402 and C5402A devices as far as the data > lines and address lines goes, ie D0-D7 and A0-A16? This far I have only > tried to read the manufacturer and device codes form the FLASH, but I > read 16bit values from the 8bit FLASH - makes no sense - that's why I am > wondering if perhaps there are hardware differences between the devices, > or are you convinced it is simply a timing problem? As far as I know, there are no hardware differences and the devices are pin-compatible. But you should always double-check. One area to check is the boot value for CLKMD register (CLKMD pins). I have seen the CLKMD pin definitions change before from one C54xx device to another. I did not see an app note for "Migrating from C5402 to C5402A" on TI's website, as there is for C5409, but you might want to search around. -Jeff > -----Original Message----- > From: Jeff Brower [mailto:] > Sent: Friday, October 17, 2003 4:52 PM > To: Jean Viljoen > Cc: > Subject: Re: [c54x] 5402 and 5402A interface to flash memory > > Jean- > > > I have succesfully implemented my own driver for interfacing > > between a 100MHz C5402 running at 100MHz and a M29W010B flash > > memory module from STMicro. > > > > This driver does not however work with the C5402A ic running > > at 100MHz (20MHz oscillator with 5x multiplier, as for the C5402). > > My whole setup is the same, except for the switch in DSP between > > C5402 and C5402A. > > > > What can the problem be? I have setup the pinouts on the pcb for > > the C5402A pinouts and am sure that that is not the problem. I am > > further using a BGA device. > > A slight timing problem. Our experience with C5409 vs. C549 and A > version devices is > that the new method, where timing is "stretched linearly" based on clock > rate, has > subtle differences vs. the old method for which only option was to > insert integer > number of wait-states. For example, we found that C549 100 MHz could > access 8 nsec > SRAM with zero wait-states, but C5409A could only work up to 94 to 96 > MHz, depending > on the particular chip. > > I suggest to try C5402A with 19.2 MHz oscillator and see what happens. > > -Jeff

Hi,

You can try few work arounds.. you can start the DSP at 20 MHz intialize all registers and then configure the clock in the software for 100 Mhz. Try to monitor the clckout signals wether it is indeed 100 Mhz or above it. If it is above you can put a lower value crystal and multiply the clks.

regards

vinodh rathna

=================================================================

HCL Technologies Limited

Chennai INDIA

=================================================================

Jean- > I have succesfully implemented my own driver for interfacing > between a 100MHz C5402 running at 100MHz and a M29W010B flash > memory module from STMicro. > > This driver does not however work with the C5402A ic running > at 100MHz (20MHz oscillator with 5x multiplier, as for the C5402). > My whole setup is the same, except for the switch in DSP between > C5402 and C5402A. > > What can the problem be? I have setup the pinouts on the pcb for > the C5402A pinouts and am sure that that is not the problem. I am > further using a BGA device. A slight timing problem. Our experience with C5409 vs. C549 and A version devices is that the new method, where timing is "stretched linearly" based on clock rate, has subtle differences vs. the old method for which only option was to insert integer number of wait-states. For example, we found that C549 100 MHz could access 8 nsec SRAM with zero wait-states, but C5409A could only work up to 94 to 96 MHz, depending on the particular chip. I suggest to try C5402A with 19.2 MHz oscillator and see what happens. -Jeff

Dear Group

I have succesfully implemented my own driver for interfacing between a 100MHz C5402 running at 100MHz and a M29W010B flash memory module from STMicro.

This driver does not however work with the C5402A ic running at 100MHz (20MHz oscillator with 5x multiplier, as for the C5402). My whole setup is the same, except for the switch in DSP between C5402 and C5402A.

What can the problem be? I have setup the pinouts on the pcb for the C5402A pinouts and am sure that that is not the problem. I am further using a BGA device.

Any ideas?

Rgds

Jean Viljoen

Development Engineer

Azoteq (Pty) Ltd

Tel: +27 21 863 0033

Fax: +27 21 863 1512