P1076 January 26, 2012 Meeting Minutes

Attendees:

• PeterFlake * HansTiggeler * DavidBishop * JimLewis * JarekKaczynski * JohnShields

Agenda:

• Approve Jan 5 meeting minutes: Motion Jerry 2nd Peter
• Look-Up Table
• DPI

Fixed and Floating Packages: Look-Up Table

• New fixed and float packages to implement functions such sin, log, ... from math real
• 3 versions of implementations
  • Use math real
  • Use equation and stay in fixed/float
  • Use look up table
• Tested all 3 in synthesis
  • Equation work to avoid division
  • Look up table work to minimize size of ROM
• Division of long number - look up table of reciprocal
• Proposed additions to fixed_generic_pkg and float_generic_pkg
  • floor - integer closest to 0
  • Ceil -
  • Precision - number of bits to keep in the fraction
• AI: David to add documentation linked through the Collected Requirements list

DPI

• Proposal on TWIKI progressing
• Issue from John Shields: Types like natural cannot be differentiated from integer on subprogram calls
• Review of current proposal on Collected Requirements
• Can the C side of DPI see updates on signals? no
  • Everything on the DPI side is as if it were passed by value
• Important that the C code is reentrant
• Peter to update per issues in discussion

Encryption

• Jerry and John: Working on syncing up with IEEE P1735

Next Meeting Date (proposed):

Thursday February 16, 8 am Pacific