FreeCalypso > hg > fc-small-hw
comparison 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 |
comparison
equal
deleted
inserted
replaced
| 27:b58388f57c16 | 28:bd7eec55ebc0 |
|---|---|
| 11 /* IC packages */ | 11 /* IC packages */ |
| 12 pkg_LQFP48 numpins 48; | 12 pkg_LQFP48 numpins 48; |
| 13 pkg_5pin numpins 5; | 13 pkg_5pin numpins 5; |
| 14 pkg_8pin numpins 8; | 14 pkg_8pin numpins 8; |
| 15 | 15 |
| 16 /* 74LVC125A single buffer and common part subpackages */ | 16 /* 74LVC541A single buffer and common part subpackages */ |
| 17 buffer_ic_slot mapped_pins (A, Y, nOE); | 17 buffer_ic_slot mapped_pins (A, Y); |
| 18 buffer_ic_common mapped_pins (Vcc, GND); | 18 buffer_ic_common mapped_pins (Vcc, GND, nOE1, nOE2); |
| 19 | 19 |
| 20 /* crystal resonator */ | 20 /* crystal resonator */ |
| 21 xtal_2pin_pkg numpins 2; | 21 xtal_2pin_pkg numpins 2; |
| 22 | 22 |
| 23 /* connectors */ | 23 /* connectors */ |