diff options
| -rw-r--r-- | decoders/jtag/__init__.py | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/decoders/jtag/__init__.py b/decoders/jtag/__init__.py index 48b6ec1..79fc6c1 100644 --- a/decoders/jtag/__init__.py +++ b/decoders/jtag/__init__.py @@ -27,7 +27,25 @@ and flashing various digital ICs. TODO: Protocol details. -TODO: Protocol decoder output format description. +Protocol output format (WORK IN PROGRESS!): + +JTAG packet: +[<packet-type>, <data>] + +<packet-type> is one of: + - 'NEW STATE': <data> is the new state of the JTAG state machine. + Valid values: 'TEST-LOGIC-RESET', 'RUN-TEST/IDLE', 'SELECT-DR-SCAN', + 'CAPTURE-DR', 'SHIFT-DR', 'EXIT1-DR', 'PAUSE-DR', 'EXIT2-DR', 'UPDATE-DR', + 'SELECT-IR-SCAN', 'CAPTURE-IR', 'SHIFT-IR', 'EXIT1-IR', 'PAUSE-IR', + 'EXIT2-IR', 'UPDATE-IR'. + - 'IR TDI': Bitstring that was clocked into the IR register. + - 'IR TDO': Bitstring that was clocked out of the IR register. + - 'DR TDI': Bitstring that was clocked into the DR register. + - 'DR TDO': Bitstring that was clocked out of the DR register. + - ... + +All bitstrings are a sequence of '1' and '0' characters. The right-most +character in the bitstring is the LSB. Example: '01110001' (1 is LSB). Details: https://en.wikipedia.org/wiki/Joint_Test_Action_Group |