Board:          FMLN
Function:       Ram Write Protect Mask PAL
Author:         Bill Walz
Date:           6-SEP-1991 
Semiconductor-device:         Cypress CY100E301  (16P8-type)

    This is the EQN  file, in SPRINT  format, for the  Ram Write Protect
Mask PAL which resides on the FMLN card.

    This  section defines the  equations  which are  implemented in this
PAL.

    This PAL is  responsible for  maintaining the RAM  WRITE ENABLE bits
for the Ram array on the FMLN card.  When the Ram Write Enable bit drops
low then the coresponding Ram is  now writable. The conditions that must
be met for this to happen are:

    WRITE PRT(n) must be low and /WRITE FUNCTION ADDRESS 3 must be low.



    Truth Table:

    WRITE PRT(n) | /WRITE FUNCTION ADDRESS 3 |  /WRITE EN(n)
    -----------------+---------------------------+-------------------
                     |                           |   
          0          |             0             |         0
          0          |             1             |         1
          1          |             0             |         1
          1          |             1             |         1
                     |                           |


    Equation:

           /WRen(n) =  WRprt(n) + /WRfunc3

    This section  describes the PIN LIST. This  PIN LIST agrees with the
Schematic of the FMLN card.

device e301;
WRprt0    =       3
WRprt1    =       10
WRprt2    =       11
WRprt3    =       13
WRprt4    =       14
WRprt5    =       9 
WRprt6    =       16
WRprt7    =       15
/WRfunc3  =       23
/WRen0    =       8 
/WRen1    =       7
/WRen2    =       5 
/WRen3    =       4 
/WRen4    =       21
/WRen5    =       20
/WRen6    =       18
/WRen7    =       17

start

/WRen0 =
                WRprt0 + /WRfunc3;

/WRen1 =
                WRprt1 + /WRfunc3;

/WRen2 =
                WRprt2 + /WRfunc3;

/WRen3 =
                WRprt3 + /WRfunc3;

/WRen4 =
                WRprt4 + /WRfunc3;

/WRen5 =
                WRprt5 + /WRfunc3;

/WRen6 =
                WRprt6 + /WRfunc3;

/WRen7 =
                WRprt7 + /WRfunc3;

' End of PAL Equations

'Vectors

vector XX0LLNLL000N0000LLNLLX0N
vector XX0HHNHH000N0000HHNHHX1N
vector XX1LLNLH000N0000LLNLLX0N
vector XX1HHNHH000N0000HHNHHX1N
vector XX0LLNHL010N0000LLNLLX0N
vector XX0HHNHH010N0000HHNHHX1N
vector XX0LHNLL001N0000LLNLLX0N
vector XX0HHNHH001N0000HHNHHX1N
vector XX0HLNLL000N1000LLNLLX0N
vector XX0HHNHH000N1000HHNHHX1N
vector XX0LLNLL000N0100LLNLHX0N
vector XX0HHNHH000N0100HHNHHX1N
vector XX0LLNLL100N0000LLNHLX0N
vector XX0HHNHH100N0000HHNHHX1N
vector XX0LLNLL000N0001LHNLLX0N
vector XX0HHNHH000N0001HHNHHX1N
vector XX0LLNLL000N0010HLNLLX0N
vector XX0HHNHH000N0010HHNHHX1N

end