what is the direct definition of primitives at fpga ... ?

[segevron]

..........................................

 

[yadavvlsi]

Primitives are basic components that makes a FPGA. e.g. Flip-Flips, Lookup-Tables, Shift Registers, and RAMs.

 

[xtcx]

To be even clear,Primitives are perhaps vendor specific components such as IO Buffers, clock buffers, multipliers, PLLs, DPLL, BUFGMUX, Etc
You should refer to the datasheet for complete list of primitive components.

 

[segevron]

can u give me a good example for what is not consider as primitive from the elements that the include at the fpga ....?

 

[xtcx]

I dont know what you are exactly beating up, but

See, what are all the components that are built-in or embedded in an FPGA is called primitives.
They are PLLs, BUFFERS, DSPMULT, RAM, FIFO, etc. What are all the components that you develop becomes non-primitive and hence you choose your own structural design. for eg, Adder, comparator, BCD, clock divider, etc.

IPs may or may not be a primitive one.....Mostly IPs use primitive components and build their models on top of it.

 

[Jansi Meena]

Is primitive components always be same for all devices?.
Also, to simulate, does it require special attention?.

 

[xtcx]

Not necessarily. For each devices, the primitive component may change. This is because every new device FPGA will have a newer component, but although for old components, you can use the same old component, but you must make sure to check the "Device name" mentioned in generic parameters. I wonder why even this parameter is required, this information we already provide in project options.

Might be when you wish to make your code portable, this can be used anywhere, just by changing the device name.

To simulate, the simulator tool must be aware of these components functionality. Hence, yes you need to make to tool know where your primitive component lies and what it does. This what we call library compilation. Usually primitive components come as a library(Collection of VHD or V files).

 

[jimwu88]

Each Xilinx device family has its own libraries user guide, which describes primitives for that family. For example, below is the libraries UG for the 7 series (By the way, download Xilinx Document Navigator to manage all Xilinx documents) :

https://www.xilinx.com/support/documentation/sw_manuals/xilinx14_1/7series_hdl.pdf

Is primitive components always be same for all devices?.
Also, to simulate, does it require special attention?.