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Questions about PCI-X FAQ



In the PCI SIG PCI-X faq (http:/www.pcisig.com/pci_x-faq.doc),
the protocol details say:
 
1) Register to register bus design
2) Transaction byte count - relaxed ordering rules
3) Split transactions and non-coherent transactions enabled.
 
Could someone who define these a little more clearly, especially 1)?
Is this a move to something more like ISO/IEC 13213 and IEEE 1394?
 
/eric