TDA2x: Different EVE timings in simulator and Vision SDK Framework

Prashant Kothari

Hello,

We are using Vision SDK 3.0 and CCS 5.5 VAYU Simulator.

This is regarding different EVE timings in simulator and Vision SDK Framework.

In EVE Simulator, We are using _tsc_start() and _tsc_gettime() APIs to calculate total number of cycles. Total Cycles is 4469596.

Considering EVE frequency 650 Mhz, Total time is 6.876302 msec. For EVE frequency 500 Mhz, Total time is 8 msec.

In Vision SDK framework, with global timer and EVE frequency 650 Mhz, Total time is 20 msec.

DMA is running is foreground. We are not sure about reason for timing difference.

Can you please suggest mechanism wherein we can reduce time in framework?

Regards,

Prashant Kothari

over 8 years ago

0 Anshu Jain over 8 years ago

TI__Guru 56820 points

Hi Prashant,
Are there other applications ( which are also accessing DDR ) running when you are measuring with VSDK? DDR could get bottle necked which may be causing increase in timing at SDK level.

Regards,
Anshu

0 Prashant Kothari over 8 years ago in reply to Anshu Jain

Prodigy 230 points

Hi Anshu,

In my application, DSP and EVE is accessing DDR.

With DSP disable, total board time is same.

Regards,
Prashant Kothari

0 Anshu Jain over 8 years ago in reply to Prashant Kothari

TI__Guru 56820 points

Hi Prashant,

When you say total board time is same you mean same with the standalone one or same as the one CSDK frameowork?

Regards,

Anshu

0 Prashant Kothari over 8 years ago in reply to Anshu Jain

Prodigy 230 points

I have disabled DSP processing in VSDK Framework. So, Now EVE is only accessing DDR.

However, Total board time remains same.

0 Ewald Schan over 8 years ago

TI__Intellectual 2930 points

Prashant,

please note that ARP32 executes your _tsc functions and it runs at half of the EVE clock speed (e.g. 500MHz / 2 = 250MHz). Which means that the TSC gets incremented by each clock cycle but at lower frequency as you calculate. In your case a TSC total count of 4469596 cycles @ 250 MHz results in ~ 17.88ms.

In addition the simulator is only device functional but not cycle accurate.

Also you can also use TSC of ARP32 on your device.

0 Srinath Gopalan76 over 8 years ago

Prodigy 170 points

Hi Prashant,

Is your VAYU Simulator installed perfectly and if so is it working fine ?

I have some issues in the installation and need some clarity in it.

Regards

Srinath

0 Yordan Kamenov over 8 years ago in reply to Srinath Gopalan76

TI__Mastermind 42515 points

Hi Srinath,

can you start a new thread and describe what is your issue?

Thanks,
Yordan

0 Srinath Gopalan76 over 8 years ago in reply to Yordan Kamenov

Prodigy 170 points

Hi Yordon,

I have installed CCS5.5 and when installing VAYU simulator for running EVE , I have many issues in it. The installation is not complete and it generates three error logs each time even after ignoring the CCS update option when prompted during the process.

I require an immediate solution to the issue and it has been long ever since it emerged.

Regards

Srinath

0 Anshu Jain over 8 years ago in reply to Srinath Gopalan76

TI__Guru 56820 points

Hi Srinath,
I think you already have another thread running for this issue : e2e.ti.com/.../2463713
we have looped in more folks to look into the issue. Please respond to the latest update on that.

Regards,
Anshu

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TDA2x: Different EVE timings in simulator and Vision SDK Framework