FreeCalypso > hg > fc-small-hw
diff duart28/src/primitives @ 28:bd7eec55ebc0
duart28: new design ideas
* added input buffers (LVC with Ioff feature) to prevent high current flow
from powered-up target into powered-down FT2232D inputs;
* added series resistors on outputs to limit current flow from powered-up
adapter into powered-down Calypso target;
* buffer IC changed from 74LVC125A to 74LVC541A.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 28 Jun 2020 22:06:24 +0000 |
| parents | 43097651a26d |
| children |
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--- a/duart28/src/primitives Sat Jun 13 18:12:28 2020 +0000 +++ b/duart28/src/primitives Sun Jun 28 22:06:24 2020 +0000 @@ -13,9 +13,9 @@ pkg_5pin numpins 5; pkg_8pin numpins 8; -/* 74LVC125A single buffer and common part subpackages */ -buffer_ic_slot mapped_pins (A, Y, nOE); -buffer_ic_common mapped_pins (Vcc, GND); +/* 74LVC541A single buffer and common part subpackages */ +buffer_ic_slot mapped_pins (A, Y); +buffer_ic_common mapped_pins (Vcc, GND, nOE1, nOE2); /* crystal resonator */ xtal_2pin_pkg numpins 2;