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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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 Posted: Tue Mar 18, 2008 8:18 am Post subject: WinChip (Evergreen MX Pro) |
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I read that these were produced in speeds up to 233Mhz but didnt see any above that which is why I am curious about this chip. Are these common?
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Elar
Joined: 16 Jul 2003
Posts: 746
Location: Tallinn, Estonia
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| Posted: Tue Mar 18, 2008 9:33 am Post subject: |
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| Standard speeds for C6 were 180, 200, 225 and 240 MHz. |
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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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| Posted: Tue Mar 18, 2008 10:32 am Post subject: |
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| I meant for the Evergreen Mx Pro versions but I just came across some additional documentation that shows the 240 so probably nothing special. |
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thomsonicus
Joined: 11 Dec 2007
Posts: 226
Location: Poland
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| Posted: Tue Mar 18, 2008 5:19 pm Post subject: |
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nice nevertheless. why is it missing those couple of pins?
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el_gecko
Joined: 25 May 2005
Posts: 1553
Location: Nice, France
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| Posted: Tue Mar 18, 2008 5:21 pm Post subject: |
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On my MxPro, there are these 3 missing pins too 
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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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| Posted: Thu Mar 20, 2008 7:51 am Post subject: |
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| el_gecko wrote: | | On my MxPro, there are these 3 missing pins too |
I came across another picture where these pins were missing. |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Thu Mar 20, 2008 10:43 am Post subject: |
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The missing pins are named BF0 - BF2, and are the bus frequency control pins. I am not sure of the effect of removing them all, but the IDT manual says:
| IDT WinChip C6 Processor Datasheet wrote: | Because the IDT WinChip C6 is designed to support several
frequencies higher than 233 MHz, the IDT WinChip C6
processors interpret the bus frequency control pin slightly
differently from the Pentium processor’s specification. The IDT
WinChip C6’s interpretation is shown in Table 4-1. Note that
the changes redefine fractional bus frequency multiples (which
the IDT WinChip C6 does not support) to higher multiples. A
new pin, BF2 (W-35), is also supported to allow for higher
frequencies. The IDT WinChip C6 pulls up all three of the BF
pins so that the default is 4x multiplier.
| Code: | BF2 BF1 BF0 IDT WinChip C6 Clock Ratio P55 Clock Ratio
1 0 0 reserved 5/2x
1 0 1 3x 3x
1 1 0 2x 2x
1 1 1 4x 3/2x
0 0 0 reserved
0 0 1 5x
0 1 0 4x
0 1 1 reserved |
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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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| Posted: Thu Mar 20, 2008 10:52 am Post subject: |
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| debs3759 wrote: | The missing pins are named BF0 - BF2, and are the bus frequency control pins. I am not sure of the effect of removing them all, but the IDT manual says:
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Interesting info Debs! |
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