Re: PCI 2.0/2.1 Compatibility Issue

["Kevin Brace" <kevinbraceusenet@hotmail.com>]

Scott,

Do you have the RTL code of the PCI interface, so that you can make 
modifications?
Assuming that your company has the RTL code, and can make modifications, I 
think the problem is that when during configuration cycles, it is not fully 
decoding Function Number (AD[10:8]) that appears on AD[31:0].
Your card should respond to a configuration access only when Function Number 
is 000b and 001b (Function 0 and Function 1), AD[1:0] is equal to 00, and 
IDSEL is 1 by asserting DEVSEL#.
For all other cases (i.e., The Function Number is 2 through 7), don't 
respond to the configuration cycle, and let the configuration cycle 
terminate as a master abort, so that the host PCI bridge will know that 
Function 2 through 7 don't exist.



Kevin Brace (In general, don't respond to me directly, and respond within 
the mailing list.)



>From: Scott Davis <sdavis@Futurex.com>
>To: "'pci-sig@znyx.com'" <pci-sig@znyx.com>
>Subject: PCI 2.0/2.1 Compatibility Issue
>Date: Fri, 28 Jun 2002 11:07:13 -0700
>
>We have designed a multifunction PCI Add-In card that is demonstrating a
>strange anomaly.  We have the following scenarios:
>
>Scenario 1:
>
>We set the Function 0 HeaderType to 0x80, the Function 1 Header Type to 
>0x80
>and the remaining 6 Header Types to 0x00.  We return 0x00000000 for all
>registers that are not implemented.  PCs that support PCI 2.0 correctly
>address and access Function 1 and 2 I/O space.  PCs that support PCI 
>2.1/2.2
>incorrectly address and access Function 2 I/O space.
>
>Scenario 2:
>
>We set the Function 0 HeaderType to 0x80, the Function 1 Header Type to 
>0x00
>and the remaining 6 Header Types to 0xff.  We return 0xffffffff for all
>registers that are not implemented.  PCs that support PCI 2.1/2.2 correctly
>address and access Function 1 and 2 I/O space.  PCs that support PCI 2.0
>incorrectly address and access Function 2 I/O space.
>
>Does anyone have an idea about what is going on?
>
>Thanks,
>
>Scott Davis
>Vice President
>Director of Engineering
>Encryption Products Group Manager
>Jones Futurex, Inc.
>3715 Atherton Rd.
>Suite 1000
>Rocklin, CA 95765
>(916)632-9450 x1323
>sdavis@futurex.com
>www.futurex.com



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