CPLD example: Dual 74xx595s

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CPLD-Dual595s.png

Two serial counters configured to replace the two 74xx595's like used in the LCD backpacks.

A possible UCF definition for this schema:

NET OEn    LOC = P19;
NET RCLK   LOC = P18;
NET SRCLRn LOC = P11;
NET SRCLK  LOC = P12;
NET SER    LOC = P13;

NET XLXN_6<0> LOC = P1;
NET XLXN_6<1> LOC = P2;
NET XLXN_6<2> LOC = P4;
NET XLXN_6<3> LOC = P8;
NET XLXN_6<4> LOC = P9;
NET XLXN_6<5> LOC = P14;
NET XLXN_6<6> LOC = P44;
NET XLXN_6<7> LOC = P43; 

NET XLXN_7<0> LOC = P38;
NET XLXN_7<1> LOC = P37;
NET XLXN_7<2> LOC = P36;
NET XLXN_7<3> LOC = P35;
NET XLXN_7<4> LOC = P34;
NET XLXN_7<5> LOC = P29;
NET XLXN_7<6> LOC = P27;
NET XLXN_7<7> LOC = P26;