HiI recently designed a board in which tms320c6726 is used. I produce two series of boards. the only difference between them is the distrubutor of the DSP chips that is I bought the DSPs from to distinct supplier. The first group of the boards worked good.
As it is written in the daatasheet of the chip the content of the address 0x00c of the DSPs was 0xC9230C100. I bought some chips from a different distributor and I found out that the content of address 0x00C of the ROM is 0xD710E001 which is not the same as that I expect based on the datasheets. The new DSPs worked good at first. I could connect to them via jtag emulator and program and run them. but the DSPLIB functions are not resident on their ROM or in the place that I expect based on the datasheet. I wonder if these are new versions of the DSP or are the wring DSPs. I can't find anything about ROM content besides the 0xC9230C100 ROM version.
I ought both chips as TMS320C6726BRFP and they are the same in the first line of the part marking but the second line of the marking are different.
for the good chip the second line is: C12-12AHGYTG4
for the bad (or not working) chip the second line is: C12-96FCV0TG4
the content of the address 0x00c for the chips are as follows:
for the good chip: 0xC9230C100 which is the same as what I expect based on the datasheet
for the bad one: 0xD710E001 which seems to be new or wrong
please help me
Regards,Yasser
