Library/package with sequential circuits primitives In HDL (Vendors or open-source)

[FlyingDutch]

Hello,

I would like to ask if somebody know about library in VHDL/Verilog with soundly designed (and optimized) primitives of "sequential logic circuits" I mean basic "bricks" for elaborating more complicated sequential circuits. I mean library/package made by one of FPGA circuits vendors like Xilinx/Intel or verified open-source one. I seen such basic primitives in Intel "Quartus" software but these primitives had been available when user was using "Schematics Editor". I am interested in such library written in one of HDL languages. I found for example such simlpe definitions of T and D flip-flops. Here are examples:

Sorry for pasting images, but this definition I only have as an image available (it is citation from polish book about VHDL).

I mean library with all kind of flip-flops, counters, various type of registers (serial/parallel), frequency dividers etc. The best would be library/package with primitives from TTL low/medium ICs or CMOS4000 series. I mean also such bricks like "reverse counters" (with asynchronic reset,set) serial-parallel registers (also shift registers), simple ALUs,

Could someone to reccomend such library/package?

Thanks in advance and regards

 

[FvM]

High level designs (either VHDL or Verilog) are mostly witten using behavioral descriptions rather than low level macros, e.g. TTL logic equivalents.

I used Quartus maxplus2 TTL libraries with my first FPGA excercises 20 years ago and never again.

 

[FlyingDutch]

I used Quartus maxplus2 TTL libraries with my first FPGA excercises 20 years ago and never again.

Why, it hadf been so badly written ? I so many primitives as VHDL/Verilog functions - what is bad in such approach?

Best regards

 

[TrickyDicky]

For the same reason software programmers don't write in assembler, rtl engineers don't use primitives libraries. In addition to not being easy to debug a design with them or easy for others to understand, they are also non portable. Its quite normal to take rtl and compile it for multiple vendors.