FreeCalypso > hg > freecalypso-schem2

annotate README @ 96:ae6951a70d2b

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U403: change from 74LVC2G125 to 74LVC2G126 The two parts have the same footprint and pinout, but '126 3-state buffers have active-high OE inputs instead of active-low. The change is purely for software benefit: having GPIO 11/12 set to 1 correspond to that current contribution being enabled will be much more intuitive for developers and tinkerers.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 09 May 2022 19:27:11 +0000
parents 0401fe6893ea
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Mychaela Falconia <falcon@freecalypso.org>
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1 This Hg source repository contains work in progress towards schematic-level
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Mychaela Falconia <falcon@freecalypso.org>
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2 design of FreeCalypso Venus GSM phone handset prototype and development board.
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Mychaela Falconia <falcon@freecalypso.org>
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3 Instead of graphical schematics, we use our own in-house board-level hardware
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Mychaela Falconia <falcon@freecalypso.org>
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4 design language (ueda, based on structural subset of Verilog), but aside from
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Mychaela Falconia <falcon@freecalypso.org>
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5 the different form of representation, this level of design is equivalent to
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Mychaela Falconia <falcon@freecalypso.org>
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6 schematics.