[libre-riscv-dev] [Bug 192] New: Level-shifter Cell needed (HI-to-low, low-to-HI

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=192

            Bug ID: 192
           Summary: Level-shifter Cell needed (HI-to-low, low-to-HI
           Product: Libre Shakti M-Class
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Hardware Layout
          Assignee: lkcl at lkcl.net
          Reporter: lkcl at lkcl.net
                CC: libre-riscv-dev at lists.libre-riscv.org
   NLnet milestone: ---

GPIO is often at one voltage (3.3v, 1.8v, 1.5v) whilst the
main processor core is at another (1.8v, 1.2v or less in lower geometries).
sometimes GPIO can run at *between* 1.8v-3.3v or between 1.2v-1.5v.
we therefore need level-shifters between the GPIO I/O pads and the
main processor core voltage, on both the input and output sides.

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