Differences Between Warm Reset and Software Reset of C674x

Tsutomu Furuse

Hi.

Would you tell me the differences of the effect between the warm reset and the software reset triggered by RSCTRL register?
Like the warm reset, the software reset preserves data in the internal RAM and initializes the all internal logic to the default states?

Best regards,
Tsutomu Furuse

over 10 years ago

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Hi,
Let me do some sanity check with code and get back to you on this.
Thanks for your patience.

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Hello Tsutomu,

I will try to find the difference and significance of SWRESET in SoC specification document and update you.

Thanks for your patience.

Regards,
Senthil

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Hi Tsutomu,

Like the warm reset, the software reset preserves data in the internal RAM and initializes the all internal logic to the default states?

I've tested sw that has reset code (RSCTL) and able to retain the "Shared RAM" content after I did sw reset.
Yes, it would preserves the internal RAM content when we do sw reset.

0 Tsutomu Furuse over 10 years ago in reply to Titusrathinaraj Stalin

Expert 1435 points

Titus,

Thank you for the test. It will be of much help for me. But do you have a specification on the software reset?

Best regards,
Tsutomu Furuse

0 Titusrathinaraj Stalin over 10 years ago in reply to Tsutomu Furuse

TI__Guru** 116100 points

What do you mean by specification of sw reset ?
If you expecting timing related, then, Senthil would assist you on this.

0 Tsutomu Furuse over 10 years ago in reply to Titusrathinaraj Stalin

Expert 1435 points

Titus,

Thank you very much for your reply.

Since my customer is designing a C674x board now, he is very interested in the device pin states at the software reset. The data sheet says "All device pins go to a high-impedance state" at the warm reset. Does it also happen at the software reset? Thanks.

Best regards,
Tsutomu Furuse

0 Titusrathinaraj Stalin over 10 years ago in reply to Tsutomu Furuse

TI__Guru** 116100 points

Hi Tsutomu,
For this question, hardware experts would support you.
Thanks for your patience.

0 Senthilkumar Srinivasan over 10 years ago in reply to Tsutomu Furuse

TI__Mastermind 43660 points

Hello Tsutomu,

The Software reset (PLLC0 Reset Control Register (RSCTRL) SWRST bit) meant for software initiated reset- Need for security purpose.

This reset acts same like Warm reset, Internal memory retained (Not external memory) ,All other logic will get reset and the I/O’s are Hi-Z (Tri-Stated).

Hope this helps.

Regards,

Senthil

0 Tsutomu Furuse over 10 years ago in reply to Senthilkumar Srinivasan

Expert 1435 points

Senthil,

Thank you very much for your answer.

Best regards,
Tsutomu Furuse

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Differences Between Warm Reset and Software Reset of C674x