1. For Xilinx chip:

Explanation of FPGA chip naming rules

Xc7vx485t is a chip model, which indicates that it belongs to the V7 series chip of Xilinx company. 485t indicates that it has 485000 logic units.

-2 indicates the speed level. For Xilinx FPGA, there are generally three levels – 1, – 2 and – 3. The higher the value, the higher the speed.

FFG indicates the packaging method,1761 indicates the number of pins,C represents the temperature grade, which is commercial. If I is industrial.

The same chip can have multiple speed levels. Different speed levels represent different performance, and different performance leads to great differences in chip price. The speed level of the chip is not designed, but actually tested and calibrated after the chip is produced. The rate of fast chips in the total output is low, and the price is correspondingly high. Then, what factors lead to the performance differences of the same batch of chips, mainly including the following two points:

The speed level of the chip depends on the gate delay and line delay inside the chip. These two factors also depend on the length L and capacitance C of the transistor. The difference between these two values finally depends on the production process of the chip.

In the process of chip production, there is a stage called speed binning. It is to use a certain method to screen and classify the produced chips according to a set of standards, and then divide them into different speed levels.

2. For Altera’s FPGA chip

Take ep2c35f672c6n as an example:

EP: process;

2c: cyclone II (s for Stratix, a for arria);

35: number of logical units, 35 represents about 35K logical units;

F: Indicates the PCB package type, f is FBGA package, e (eqfp), q (PQFP), u (ubga), m (MBGA);

Package Type:

E: PlasTIc Enhanced Quad Flat Pack (EQFP)

Q: PlasTIc Quad Flat Pack (PQFP)

F: FineLine Ball-Grid Array (FBGA)

U: Ultra FineLine Ball-Grid Array (UBGA)

M: Micro FineLine Ball-Grid Array (MBGA)

672: indicates the number of pins;

C: Operating temperature, C indicates that it can work at 0 ° C to 85 ° C, I indicates that it can work at – 40 ° C to 100 ° C, and a indicates that it can work at – 40 ° C to 125 ° C;

OperaTIng Temperature:

C: Commercial temperature (TJ = 0°C to 85°C)

I: Industrial temperature (TJ = -40°C to 100°C)

A: AutomoTIve temperature (TJ = -40°C to 125°C)

6: Speed level: 6 is about 500MHz, 7 is about 430mhz, and 8 is about 400MHz;

N: Suffix, n indicates lead-free, ES engineering sample.

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