2008-07-29 08:27:47     VCO_MULTI out of range

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2008-07-29 08:27:47     VCO_MULTI out of range

Miquel Soler i Mir (SPAIN)

Message: 59543   

 

Hello.

 

I'm configurin the Clock setting for CORE_CLOCK and SCLK.

 

In my test I'm configurion the core clock at 325 MHz and SCLK to 130 MHz.

 

The range of VCO_MULTI is between 1 and 64.

 

The  range of Core Clock Fivider is 1,2,4 or 8.

 

The range of System Clock Divide is between 1 and 15.

 

I'm using this setting

 

(26)    VCO Multiplier

 

Core Clock Divider (2)  --->

 

(5)   System Clock Divider

 

 

 

making the kernel the systema answer me this:

 

arch/blackfin/mach-common/arch_checks.c:36:4: error: #error "VCO selected is more than maximum value. Please change the VCO multipler"

 

I don't know the reason of this error, all the paremeters are in range.

 

Can somebody help me ?

 

 

 

Miquel Soler i Mir

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2008-07-29 08:50:14     Re: VCO_MULTI out of range

Michael Hennerich (GERMANY)

Message: 59545   

 

Your VCO may not exceed the speed grade of your device.

 

Which is typically 500 or 600MHz.

 

26 * 25MHz = 650 MHz

 

-Michael

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2008-07-29 09:04:07     Re: VCO_MULTI out of range

Mike Frysinger (UNITED STATES)

Message: 59546   

 

if you want the exact range, read the datasheet for your part

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2008-07-30 09:12:53     Re: VCO_MULTI out of range

Miquel Soler i Mir (SPAIN)

Message: 59608   

 

OK. Thanks

 

I read the datasheet and I have a question:

 

The max freq for example ADSP-BF537BBCZ-5A is 500 MHz. But this max freq of  VCO or Core_clock?

 

Thanks.

 

Miquel Soler i Mir

 

 

 

 

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2008-07-30 10:15:46     Re: VCO_MULTI out of range

Michael Hennerich (GERMANY)

Message: 59609   

 

The ADSP-BF537 datasheet gives you the details:

 

Phase-Locked Loop Operating Conditions:

Parameter Minimum Maximum Unit

fVCO Voltage Controlled Oscillator (VCO) Frequency: 50 to Speed Grade MHz

 

Speed Grade is Core CLK ...

 

-Michael

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2008-07-30 11:54:46     Re: VCO_MULTI out of range

Wei Jiang (CHINA)

Message: 59613   

 

Miquel,

 

       look at this words in arch/blackfin/Kconfig:

 

config MAX_VCO_HZ

        int

        default 600000000 if BF522

        default 400000000 if BF523

        default 400000000 if BF524

        default 600000000 if BF525

        default 400000000 if BF526

        default 600000000 if BF527

        default 400000000 if BF531

        default 400000000 if BF532

        default 750000000 if BF533

        default 500000000 if BF534

        default 400000000 if BF536

        default 600000000 if BF537

        default 533333333 if BF538

        default 533333333 if BF539

        default 600000000 if BF542

        default 533333333 if BF544

        default 600000000 if BF547

        default 600000000 if BF548

        default 533333333 if BF549

        default 600000000 if BF561

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