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What do the speed grades in the pull-down menu mean when registering a 28-nm device in the Quartus II device settings?

The first number is the FPGA fabric speed grade, followed by the transceiver speed grade.


As an example, for Arria V GX, GT, SX, and ST devices, the drop list looks like this:

3_H3
3_H4
4_H4
5_H3
5_H4
6_H6

Example: 5AGXFB3H4F35I3 becomes "3_H4".

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