Difference: AMC13UserManual (42 vs. 43)

Revision 4310 Jul 2018 - EricHazen

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META TOPICPARENT	name="HcalDTC"

THIS MANUAL IS INCOMPLETE but what is written here should be more accurate and up to date than the old "functional specification". Please e-mail me if you find mistakes/omissions here (Eric H).

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The AMC13 outputs the TTS state as the four-bit code described in the links above:

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0000	Disconnected	Hardware Failure or broken cable
0001	Overflow Warning	Imminent buffer overflow
0110	DAQ Overflow Warning	Overflow warning due to DAQ link backpressure (2018)
0010	Sync Lost	AMC13 is not synchronized with DAQ due to buffer overflow
0100	Busy	Cannot accept triggers
1000	Ready	Ready to accept triggers
1001	Private Request 1	Available for private use (2018)
1010	Private Request 2	Available for private use (2018)
1011	Private Request 3	Available for private use (2018)
1100	Error	Any other state that prevents functioning
1111	Disconnected	Hardware failure or broken cable

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0	0000	Disconnected	Hardware Failure or broken cable
1	0001	Overflow Warning	Imminent buffer overflow
6	0110	DAQ Overflow Warning	Overflow warning due to DAQ link backpressure (2018)
2	0010	Sync Lost	AMC13 is not synchronized with DAQ due to buffer overflow
4	0100	Busy	Cannot accept triggers
8	1000	Ready	Ready to accept triggers
9	1001	Private Request 1	Available for private use (2018)
a	1010	Private Request 2	Available for private use (2018)
b	1011	Private Request 3	Available for private use (2018)
c	1100	Error	Any other state that prevents functioning
f	1111	Disconnected	Hardware failure or broken cable

The states "Private Request 1..3" have the same priority as "Ready". They are never internally generated by the AMC13 but are passed on if received from connected AMC cards in the crate.

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(A value of 0 means "ready")

The TTS state is sent over the same 5.0Gb/s link as the DAQ data. There's an input port in our link logic on the AMC side:

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-- TTS port
    TTSclk            : in  std_logic;  -- clock source which clocks TTS signals
    TTS               : in  std_logic_vector (3 downto 0);

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When the TTS state changes, a control word is sent across the link to transfer the information with minimum latency to the AMC13.

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When the TTS state changes, a control word is sent across the link to transfer the information with minimum latency to the AMC13. A TTS state must persist for at least two BX to be guaranteed to be transmitted. Latency is "minimum" but not guaranteed to be any specific value.

Here are some more details on how the TTS state is generated in the AMC13:

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Resetting the PLL

The PLL which recovers the clock on the TTC input may lose lock if e.g. the TTC clock is interrupted for some reason. This PLL may be reset using the following command in '''AMC13Tool2''':

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  > wv 0x0 0x8

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  > wv 0x0 0x8

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Currently there is no address table entry nor dedicated command to accomplish this. Also, I am fairly certain that this reset is performed only at power-up and not as part of any software initialization sequence in the AMC13 or HCAL software!

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Currently there is no address table entry nor dedicated command to accomplish this. This reset is performed only at power-up and not as part of any software initialization sequence in the AMC13 or HCAL software! It can require up to 100us for the PLL to lock.

Eric Hazen - 21 Jun 2018

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Monitoring Registers

This section provides documentation on a few of the monitoring registers which have proven to be confusing. Eventually there should be detailed description for all registers, but who knows when this will get done!

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AMC_EvN_Mismatch (offset 0x6/0x7)

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AMC_EvN_Mismatch (offset 0x6/0x7)

This checks that the EvN in bits 32-55 of the first word sent by the AMC Matches the current EvN in the AMC13 (reset to 1 on EcR, increment each L1A) This check is performed in our link firmware in the AMC card.

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