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comparison eeproms/jtag-unbuf @ 52:ace3ed1d5ddf

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Unbuffered FT2232x JTAG article written
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 Apr 2019 01:22:41 +0000
parents 60b8cf977c3f
children 1d38af6d7be8
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51:311c800268b8 52:ace3ed1d5ddf
21 # If the FT2232D chip's ADBUS pins are connected directly to the JTAG target 21 # If the FT2232D chip's ADBUS pins are connected directly to the JTAG target
22 # without a buffer (what we mean by an unbuffered JTAG adapter), the default 22 # without a buffer (what we mean by an unbuffered JTAG adapter), the default
23 # 232 UART mode is NOT safe, as it will produce a fight on the ADBUS2 line 23 # 232 UART mode is NOT safe, as it will produce a fight on the ADBUS2 line
24 # between the UART RTS output and the target's TDO output. 245 FIFO mode is 24 # between the UART RTS output and the target's TDO output. 245 FIFO mode is
25 # expected to be safer, as all 8 ADBUS lines will be inputs for as long as 25 # expected to be safer, as all 8 ADBUS lines will be inputs for as long as
26 # ACBUS2 and ACBUS2 are left unconnected and not driven by anything. 26 # the ACBUS2 line is left unconnected and not driven by anything.
27 27
28 byte00 0x01 # Channel A: FIFO mode, D2XX driver 28 byte00 0x01 # Channel A: FIFO mode, D2XX driver
29 byte01 0x08 # Channel B: UART mode, VCP driver 29 byte01 0x08 # Channel B: UART mode, VCP driver