FreeCalypso > hg > fc-usbser-tools

annotate eeproms/jtag-unbuf @ 8:1415508e7ea2

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add README
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 04 Sep 2023 21:31:37 +0000
parents 434806360d91
children d46ea7a3fa0c
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434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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1 # This EEPROM configuration is meant to be programmed into COTS FT2232D
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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2 # breakout boards used as unbuffered JTAG adapters. The custom USB VID:PID
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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3 # belongs to Falconia Partners LLC; we hereby allow the community to program
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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4 # this PID into generic FT2232D boards (not made by Falconia) as long as
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 # it is used for the present purpose with this full EEPROM configuration.
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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6 #
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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7 # The purpose of having a custom USB ID is to prevent the Linux kernel
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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8 # ftdi_sio driver from treating this FT2232D instance as a dual UART and
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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9 # creating a ttyUSB device for Channel A. If you wish to use Channel B
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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10 # as a UART (which is still available for that purpose), you will need to use
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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11 # a Linux kernel version with commit 6cf87e5edd9944e1d3b6efd966ea401effc304ee
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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12 # included, or apply that commit locally if your kernel version does not
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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13 # include it.
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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14
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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15 vid 0x0403 # FTDI
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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16 pid 0x7151 # Allocated by FTDI to Falconia Partners LLC
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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17 manuf FTDI
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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18 product Unbuffered JTAG adapter
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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19
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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20 # We program Channel A to come up in the 245 FIFO mode prior to being
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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21 # switched into MPSSE mode by OpenOCD, as opposed to the default 232 UART mode.
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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22 # If the FT2232D chip's ADBUS pins are connected directly to the JTAG target
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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23 # without a buffer (what we mean by an unbuffered JTAG adapter), the default
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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24 # 232 UART mode is NOT safe, as it will produce a fight on the ADBUS2 line
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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25 # between the UART RTS output and the target's TDO output. 245 FIFO mode is
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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26 # expected to be safer, as all 8 ADBUS lines will be inputs for as long as
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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27 # the ACBUS2 line is left unconnected and not driven by anything.
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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28
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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29 byte00 0x01 # Channel A: FIFO mode, D2XX driver
434806360d91 eeproms: subset import from freecalypso-hwlab
Mychaela Falconia <falcon@freecalypso.org>
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30 byte01 0x08 # Channel B: UART mode, VCP driver