cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
tater73
Visitor
Visitor
5,160 Views
Registered: ‎03-31-2016

PCIe Core "last_be" undocumented in pg156

PG156 Product Guide page 124 describes the first_be and last_be Enables for the first Dword and last Dword of the payload, respectively.

 

It does not describe how the Enables shall be set when the payload is 1 or 0 DWords. Only through trial and error it was found what the core accepts for the "proper" values in these cases.

 

Please include a link to Xilinx documentation showing what these values should be set at when the Dword count is 1 or 0. Simply using the PCIe core doing trial and error is not acceptable.

 

 

0 Kudos
1 Reply
tater73
Visitor
Visitor
5,154 Views
Registered: ‎03-31-2016

Last_be is defined on page 124 for 0 Dword transfers.

Last_be is not defined on page 124 for 1 Dword transfers. Setting first_be and last_be asserted in this case causes a PCIe core fault. Please update the PG156 guide and provide a documentation describing this case.

0 Kudos