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Altera_Forum
Honored Contributor I
1,091 Views

tcl commands

For master_write_32 $master_path [expr $base_reconfig + 0x40*4], can anybody tell me what *4 means exactly? Thanks

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Altera_Forum
Honored Contributor I
53 Views

 

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For master_write_32 $master_path [expr $base_reconfig + 0x40*4], can anybody tell me what *4 means exactly? Thanks 

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Avalon-MM master addresses are 32-bits wide. The address map for the reconfiguration controller probably has the register offsets in words, i.e., the register located at 32-bit word offset 0x40 is located at byte offset 4*0x40. 

 

If the address map for the reconfiguration controller is already in byte offsets, and the register you want to access is at byte-offset 0x40, then the 4* would be unnecessary. 

 

Cheers, 

Dave
Altera_Forum
Honored Contributor I
53 Views

Thanks, Dave. 

 

* here doesn't mean multiply. So 4*0x40 = 0x00000040. Is that correct?
Altera_Forum
Honored Contributor I
53 Views

 

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here doesn't mean multiply. So 4*0x40 = 0x00000040 

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The Tcl command expr means "do some math", so 4*0x40 = 0x100 :)
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