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DUART-cable: update for DUART28
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 24 Sep 2020 02:47:14 +0000
parents f7ed8c45a8ec
children
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31:2e9719074e79 32:78c2cc6ebbb8
1 2020-09 update: we have now produced our own DUART28 adapter that takes the
2 place of PLDkit FT2232D breakout boards. The article that follows was written
3 in 2019-12, before our DUART28 was even conceived, and it was written for
4 PLDkit FT2232D adapters. The new cable that needs to be used with DUART28 is
5 different: DUART28 brings out a 10-pin header in the same pinout as our Calypso
6 boards, thus the connection between the two boards becomes a straight-through
7 10-wire ribbon cable.
8
9 Original 2019-12 article follows
10 ================================
11
1 The Calypso chip has two UARTs, called MODEM and IrDA in the chip docs. The 12 The Calypso chip has two UARTs, called MODEM and IrDA in the chip docs. The
2 primary UART (MODEM) has 4 signals (TxD, RxD, RTS and CTS), whereas the other 13 primary UART (MODEM) has 4 signals (TxD, RxD, RTS and CTS), whereas the other
3 UART (IrDA) has data leads only (TxD and RxD). TI's C-Sample and D-Sample 14 UART (IrDA) has data leads only (TxD and RxD). TI's C-Sample and D-Sample
4 boards have also established a convention whereby Calypso GPIOs 2 and 3 have 15 boards have also established a convention whereby Calypso GPIOs 2 and 3 have
5 been assigned as supplementary modem control signals for the primary MODEM UART, 16 been assigned as supplementary modem control signals for the primary MODEM UART,