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PCIe-AS - Tutorial -- Is there a CRC for the address header ? [message #914] Tue, 14 September 2004 09:54 Go to previous message
Walter F.J. Müller is currently offline  Walter F.J. Müller
Messages: 229
Registered: December 2003
Location: GSI, CBM
first-grade participant

From: lxg0311.gsi.de
During the 2nd FutureDAQ workshop (all talks in document management) some questions came up during E. Denes's talk on PCIe-AS. On the Intel PCIe website is a very good and comprehensive tutorial talk given at the PCI SIG Developers Conference 2004, see

ftp://download.intel.com/netcomms/as/devcon_as_overview.pdf

On 116 slides, many aspects of the protocol are described in quite some detail.

Now to a specific question raised during the talk:

Q: Is there a CRC protection for the address header ?

A: Yes, see on page 14 of the tutorial. The AS header is 64 bits, which include
  • 7 bit header CRC
  • 5 bit turn pointer
  • 7 bit PI number
  • 31 bit turn pool
  • 1 bit direction (forward/backward routing)


W.F.J.Müller, GSI, CBM, Tel: 2766
 
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