annotate venus/src/usb/eeprom_93Cx6_16bit.v @ 70:8bc2aa52fd23

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.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 02 Dec 2021 22:40:39 +0000
parents 9f70dc110ad7
children
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1 module eeprom_93Cx6_16bit (GND, VCC, CS, SK, DIN, DOUT);
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3 input GND, VCC;
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4 input CS, SK, DIN;
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5 output DOUT;
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7 /* instantiate the package; the mapping of signals to pins is defined here */
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8
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9 pkg_IC_8pin pkg (.pin_1(CS),
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10 .pin_2(SK),
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11 .pin_3(DIN),
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12 .pin_4(DOUT),
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13 .pin_5(GND),
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14 .pin_6(VCC), /* ORG input on some 93Cx6 variants */
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15 .pin_7(), /* no connect */
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16 .pin_8(VCC)
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17 );
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19 endmodule