manual RESET button new part: 260 g force, shorter actuator One of the main envisioned use cases for FC Venus is field demonstration: the board will be carried around, mounted on a sheet of acrylic or somesuch, it will have a battery and an antenna connected, there will be a test SIM with active service inserted, and the setup will be ready to demonstrate as a working phone at a moment's notice. But when a demo is not actively in progress, the fully assembled setup will be transported around in a big and loose ESD bag, and it will need to be equivalent to a traditional phone in its switched-off state: battery present, RTC keeping time, but not switched on all the time. Having a RESET button of the same keyswitch type as used for the regular keypad and PWON would cause a problem for such field transport scenarios: any spurious press of this button would cause a "misc boot" switch-on. Short spurious presses of PWON are filtered out by the firmware (automatic power-off if the button isn't held down long enough), but the same cannot be done for super-low-level nTESTRESET. However, a button with significantly greater operating force and a shorter actuator (not sticking out to the same height as the regular keypad buttons) should be much safer.

module lcd_subsystem (GND, VBAT, Vio, DB, RD, WR, RS, CS, RESET,
		      BL_GPIO9, BL_GPIO11, BL_GPIO12);

input GND, VBAT, Vio;

inout [15:0] DB;
input RD, WR, RS, CS, RESET;

input BL_GPIO9, BL_GPIO11, BL_GPIO12;

wire [1:3] LEDK;

lcd_module lcd (.GND(GND),
		.VCI(Vio),
		.IOVCC(Vio),
		.DB(DB),
		.RD(RD),
		.WR(WR),
		.RS(RS),
		.CS(CS),
		.RESET(RESET),
		.IM0(GND),
		.LEDA(VBAT),
		/* LEDK broken out to allow reordering for layout */
		.LEDK[1](LEDK[1]),
		.LEDK[2](LEDK[2]),
		.LEDK[3](LEDK[3])
	);

capacitor LCD_bypass_cap (Vio, GND);

bl_current_sink bl (.GND(GND),
		    .Vio(Vio),
		    .BL_GPIO9(BL_GPIO9),
		    .BL_GPIO11(BL_GPIO11),
		    .BL_GPIO12(BL_GPIO12),
		    /* LEDK broken out to allow reordering for layout */
		    .LEDK[1](LEDK[1]),
		    .LEDK[2](LEDK[2]),
		    .LEDK[3](LEDK[3])
	);

endmodule