FreeCalypso > hg > fc-small-hw
view duart28/src/vsrc/board.v @ 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 | 9e71844f4db0 |
children |
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module board (); wire GND, P_5V, P_3V3, P_2V8; wire [7:0] ADBUS, BDBUS; wire [3:0] ACBUS, BCBUS; USB_block usb ( .GND(GND), .P_5V(P_5V), .VCCIOA(P_3V3), .VCCIOB(P_3V3), .ADBUS(ADBUS), .ACBUS(ACBUS), .SI_WUA(P_3V3), .BDBUS(BDBUS), .BCBUS(BCBUS), .SI_WUB(P_3V3), .PWREN() /* no connect */ ); regulator_with_caps reg_3V3 (.GND(GND), .IN(P_5V), .OUT(P_3V3)); regulator_with_caps reg_2V8 (.GND(GND), .IN(P_5V), .OUT(P_2V8)); application_block app ( .GND(GND), .P_3V3(P_3V3), .P_2V8(P_2V8), .ADBUS(ADBUS), .BDBUS(BDBUS) ); /* auxiliary 5V output */ header_2pin aux_5V (.pin_1(P_5V), .pin_2(GND) ); endmodule