FreeCalypso > hg > freecalypso-hwlab

annotate eeproms/jtagbuf @ 167:8ffcd88d40c3

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eeproms: fc-jtag gives way to jtagbuf
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 31 Jul 2023 00:34:38 +0000
parents eeproms/fc-jtag@60b8cf977c3f
children
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167
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
1 # There exists a tentative plan in FreeCalypso queendom to produce a buffered
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
2 # JTAG adapter design, tentatively named FreeCalypso JTAGbuf. It is envisioned
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
3 # as being an FT2232H-based adapter (the previous plan was FT2232D, but that
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
4 # chip is now NRND, and the Calypso chip's maximum JTAG TCK frequency of 10 MHz
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
5 # can be achieved only with FT2232H) with LVC buffers between the FTDI chip's
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
6 # fickle I/O pins and the JTAG target connection interface.
10
7b113ad594c0 eeproms/fc-jtag: better comments
Mychaela Falconia <falcon@freecalypso.org>
parents: 7
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7 #
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8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
8 # The present EEPROM configuration is intended for this planned future
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
9 # FreeCalypso JTAGbuf adapter; it is vaporware, but the present config source
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
10 # file takes the place of much older (also vaporware) fc-jtag config that went
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
11 # back to the beginning of freecalypso-hwlab Hg repository.
7
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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12
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 vid 0x0403 # FTDI
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8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
14 pid 0x7151 # Allocated by FTDI to Falconia Partners LLC
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
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15 manuf FreeCalypso
8ffcd88d40c3 eeproms: fc-jtag gives way to jtagbuf
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
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16 product Buffered JTAG Adapter
7
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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17
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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18 # Try to be nice to Weendoze lusers (or should it be Losedows?)
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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19
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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20 byte00 0x00 # Channel A driver: D2XX
b991cf09f1da eeproms/fc-jtag: preliminary config created
Mychaela Falconia <falcon@freecalypso.org>
parents:
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21 byte01 0x08 # Channel B driver: VCP