TMS570LS3137 using HTU to transfer data from Main memory to NHET memory

Gobind Singh

Other Parts Discussed in Thread: HALCOGEN

Hi,

I am not able to transfer data from main memory to N2HET memory but I have no problem in transfering the data from N2HET memory to main memory. Following are my settings:

htuDCBCP->DCBCP_ST[0].IETCOUNT = 1;
htuDCBCP->DCBCP_ST[0].IFTCOUNT = 4;
htuDCBCP->DCBCP_ST[0].IHADDRCT = 0x00800040U;
htuREG->CPENA = 0x01;
htuREG->GC = 0x00010000;

nhet

nhetREG->HETREQEN = 0x000000FF;
nhetREG->HETREQDEST = 0x00000000;

Have i missed any settings? or any other problem? When i transfer from N2HET memory to main memory, i just change the value of IHADDRCT to 0x00000040 and it works. But the problem occurs when i transfer from main memory to N2HET memory.

over 11 years ago

0 Gobind Singh over 11 years ago

Intellectual 720 points

I found the answer. My IHADDRCT is 0x00800040, this points to the Program section of the N2HET memory. But we cannot write to the program section using HTU (Am I right?). I changed it to 0x00800048 and it worked.

0 Sunil Oak over 11 years ago in reply to Gobind Singh

TI__Mastermind 49120 points

Hi Gobind,

I will confirm this today and get back to you.

Regards, Sunil

0 Anthony F. Seely over 11 years ago in reply to Sunil Oak

TI__Guru 68920 points

Sunil, Gobind,

I did a quick check and the HTU is supposed to be able to write to the program field; but it also can be blocked if the Protect Program Field (PPF) bit in the HET GCR register is set while the N2HET is turned on. This PPF is bit 18 and turn on is indicated by a '1' in bit 0 of GCR.

The default GCR setting from HalCoGen appears to have PPF = 0; but that default program also does not include HTU capability so wondering if you would please confirm Gobind what your PPF setting is.

0 Gobind Singh over 11 years ago in reply to Anthony F. Seely

Intellectual 720 points

Thanks Anthony. The PPF bit was set to 1, that was the reason i could not modify the program field. I can do it now.

Thank you.

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TMS570LS3137 using HTU to transfer data from Main memory to NHET memory