P1076 August 1, 2013 Meeting Minutes

Attendees:

• JimLewis * DavidBishop * PeterFlake * RyanHinton * JarekKaczynski

Agenda:

• Check closure on AI from review lists.
• Review items in the collected requirements list
• Review ISAC issues and Bugzilla

Math Package Bugs

• Floating Point: Conversion to FP from Signed Fixed Point - to_float
  • Most negative signed fixed point does not get translated correctly - returns 0 instead
  • fixed on fphdl site
• Fixed Point Package: Add_Carry procedure
  
  • For signed and unsigned fixed point, the carry out is wrong (returns wrong value)
  • Can do: (Carry_sl, A_sfixed) <= A_sfixed + 1 ;
• Floating and Fixed Point Package: ?/=
  • Used not ?=
  • Instead of 'U' you get 'X'
• Fixed Point Documentation
  • Sizing rules on fixed point reciprocal is incorrect. Code is correct
  • Updated on FPHDL page - see FAQ at bottom is a list of bugs and corrected documentation
• fixed on fphdl site
• Currently many vendors pulling files from FPHDL page
  • When vendors switch to using generic version, they are likely to pull the version from IEEE and have bugs.

Math Package Upgrades

• IEEE 754/854 updates added 3 rounding routines
• Decimal floating point within a binary number
  • binary floating point has rounding issues
  • .1 added to itself 10 times will yield a rounding error

New Proposals:

• Generic Matrix Package - Ryan
  • Using packages with type generics
• Arbitrary Precision Floating Point- Ryan
  • Action Item to Ryan to look into constraint methods.

Review of old lists

• MP E2 - Eliminate passive statement restriction on entities
  • Like package/package body, may cause issues for encryption
  • May complicate analysis process.
  • Without having an architecture name, would cause issues for configurations, ...
    • Block statements require a name
  • Recommendation: Drop

New Items

• Configure entity instances - AI: Andy Jones.

Action Items:

• Action Item to Ryan to look into constraint methods for type real.

Review and Approve Meeting Minutes:

• Motion: Peter 2nd:Ryan (2nd half) / David (first half)

Next Meeting Date (proposed):

Thursday August 29, 8 am Pacific