PAL16C1                                           PAL DESIGN SPECIFICATION
P7081                                                VINCENT COLI 03/18/82
R0UNDING-CONTROL LOGIC
MMI SUNNYVALE, CALIFORNIA
D00 D01 D02 D03 D04 D05 D06 D07 D08 GND
D09 D10 D11 D12 TRU COM NC  NC  NC  VCC


TRU =  D12* D11
    +       D11* D10
    +       D11     *D09
    +       D11         * D08
    +       D11              * D07
    +       D11                   * D06
    +       D11                        * D05
    +       D11                             * D04
    +       D11                                  * D03
    +       D11                                       * D02
    +       D11                                            * D01
    +       D11                                                 * D00


FUNCTION TABLE

D12 D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00 COM TRU

;D  D  D  D  D  D  D  D  D  D  D  D  D   ROUND-CONTROL
;12 11 10 09 08 07 06 05 04 03 02 01 00    COM   TRU    COMMENTS
-----------------------------------------------------------------
 X  L  X  X  X  X  X  X  X  X  X  X  X      H     L     TRUNCATE
 L  H  L  L  L  L  L  L  L  L  L  L  L      H     L     TRUNCATE
 H  H  L  L  L  L  L  L  L  L  L  L  L      L     H     ROUND UP
 X  H  H  X  X  X  X  X  X  X  X  X  X      L     H     ROUND UP
 X  H  X  H  X  X  X  X  X  X  X  X  X      L     H     ROUND UP
 X  H  X  X  H  X  X  X  X  X  X  X  X      L     H     ROUND UP
 X  H  X  X  X  H  X  X  X  X  X  X  X      L     H     ROUND UP
 X  H  X  X  X  X  H  X  X  X  X  X  X      L     H     ROUND UP
 X  H  X  X  X  X  X  H  X  X  X  X  X      L     H     ROUND UP
 X  H  X  X  X  X  X  X  H  X  X  X  X      L     H     ROUND UP
 X  H  X  X  X  X  X  X  X  H  X  X  X      L     H     ROUND UP
 X  H  X  X  X  X  X  X  X  X  H  X  X      L     H     ROUND UP
 X  H  X  X  X  X  X  X  X  X  X  H  X      L     H     ROUND UP
 X  H  X  X  X  X  X  X  X  X  X  X  H      L     H     ROUND UP
-----------------------------------------------------------------


DESCRIPTION

THIS PAL16C1 PROVIDES THE ROUNDING-CONTROL LOGIC FOR THE "UNBIASED
ROUNDING" USED IN THE FOLLOWING PAPER ORIGINALLY PRESENTED AT SOUTHCON/82:

BIG, FAST, AND SIMPLE -- ALGORITHMS, ARCHITECTURE, AND
     COMPONENTS FOR HIGH-END SUPERMINIS
     by Ehud Gordon Gordon and Chuck Hastings