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Altera_Forum's avatar
Altera_Forum
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15 years ago

Allowed voltage levels on Stratix IV GX configuration pins?

Most of the Stratix IV GX configuration pins are powered from a dedicated supply, VCCPGM, that can be 3/2.5/1.8V.

Are min/max input and output voltage levels on those configuration pins the same as for an appropriate LVTTL standard (e.g. does VCCPGM=2.5V means that DCLK supports LVTTL25 voltage levels)?

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Yes, you can simply assume that these pins are using identical I/O cells, unless explicitely specified different.

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    OK, then if VCCPGM is 2.5V then input configuration pins will sustain VIH max of 3.6V as it's defined for 2.5V LVTTL/LVCMOS I/O in Table 1-16 of the "Stratix IV Device Handbook. Volume 4. Chapter 1. DC and Switching Characteristics"