74 TTL ICs in xilinx webpack

[7rots51]

xilinx ttl

How we can use 74 TTL ICs in ISE webpack 7.1 (xilinx)? Is there any available library including 74 series for xilinx webpack?

 

[mrakira]

where to +buy ttl discrete logic chips

74xx not include in xilinx library.If u want u can compile in new symbol.

 

[amir_shahhoseini]

chip ttl 7400 en vhdl

you can find in TTL library start with x74_

 

[kang_computer_01]

74ls series logic ics

any body have source code of 74xxx vhdl in behaveior.

 

[boardlanguage]

74 library for xilinx

How we can use 74 TTL ICs in ISE webpack 7.1 (xilinx)? Is there any available library including 74 series for xilinx webpack?

CAUTION...

The legacy 74XX logic-ICs, i.e. the actual discrete DIP chips you could buy from neighborhood electronics store, use 5 volt TTL signalling.

Modern (since Spartan 3, Virtex 4) Xilinx FPGAs are not compatible with 5V TTL! If you connect your FPGA to 74XX chip directly, you will damage/destroy the FPGA. (You can make the Xiilinx FPGA's 5v tolerant by adding series resistor to the I/O pads. But the FPGA will still send out 3.3v signalling-levels.)

Also, most companies that sell 74XX now sell CMOS (3.3v) versions of those chips. Those are safe to use with the Xilinx FPGA.