docs/LPC_Additional_LPC_Cycles.md: document added

[mgabryelski1]

Documentation for the test of additional LPC protocol cycles.

Signed-off-by: Maciej Gabryelski [email protected]

[arturkow2000]

TPM cycles actually are not supported - those are basically the same as I/O cycles but have a different START field. Peripheral checks START == b0000` before transitioning from IDLE to START.
Please also see this comment #36 (comment)

[arturkow2000]

@mgabryelski1 This is not fixed, we can't claim we support TPM cycles when actually we don't

[mgabryelski1]

These issues were corrected by me.

[arturkow2000]

@mgabryelski1 This is still not fixed, until lpn-plant/lpntpm-lpc-verilog#3 came there was no support for TPM cycles.

[arturkow2000]

@mgabryelski1 This is not fixed, we can't claim we support TPM cycles when actually we don't

[arturkow2000]

@mgabryelski1 I have fixed few things - rendering and typos. Only a few issues left, please address them.
Please check rendering before committing changes, use mkdocs serve for preview. And please shorten section headers - this doesn't render well.

[arturkow2000]

@mgabryelski1
After your last commit I/O and TPM cycles are mixed and in a few places used interchangeably.

Document describes changes done regarding the CYCTYPE field which is used to differentiate between I/O and other cycle types. There is no direct mention that TPM cycles differ only by the START field - TPM cycle is essentially an I/O cycle with START=b0101, all other cycles must be ignored (if START or CYCTYPE does not match).

Original implementation supported I/O cycles only and would not handle other cycle types properly. We added a CYCTYPE field check to skip non-I/O cycles and extended LPC Host and testbench with other cycle types, and that's fine.
The next step was to require START=b0101 to filter out what is not ment for TPM.
Please describe this step in a separate section and then provide simulation results showing that cycles with START != b0101 are skipped and that cycles with a wrong CYCTYPE are also skipped.

[arturkow2000]

@mgabryelski1 This is still not fixed, until lpn-plant/lpntpm-lpc-verilog#3 came there was no support for TPM cycles.

[arturkow2000]

Both images have gray borders on side and black dots (cut text) on the bottom, please fix this.