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PXL timing There are two asynchronous systems. STAR. PXL RDO. RDO board clock/Start. Physics collision. MTB buffering. L0 detectors. 1.5 us. L0 trigger. Sensor frame begin tx. Trigger processing. MTB buffering. TBD. TCD distribution. RDO board rx. 250 ns*.

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Pxl timing there are two asynchronous systems

PXL timing

There are two asynchronous systems.

STAR

PXL RDO

RDO board clock/Start

Physics collision

MTB buffering

L0 detectors

1.5 us

L0 trigger

Sensor frame begin tx

Trigger processing

MTB buffering

TBD

TCD distribution

RDO board rx

250 ns*

Total Trigger Delay (TTD)

1.75 us

* To be verified


Pxl timing there are two asynchronous systems

PXL RDO

PLAN

  • Use an oscilloscope to measure the transit time from the START generated on the RDO board to the receipt of the START on the low mass cable section.

  • Add the time from the Ultimate manual from the receipt of START to the first row processing.

  • The time offset between the send of START from the RDO motherboard (internal time pointer) and the beginning of the first row processing is then TD + FPD

  • This will be done with the production cables, MTB and feedthrough.

Send start

Ladder sensor

PXL RDO tx

MTB buffering

Transit Delay (TD)


Pxl timing there are two asynchronous systems

LVDS measured on one side of termination resistor.

Blue trace – Falling edge of START measured at RDO board R34

Yellow trace – START (opposite polarity) measured on driver board R95

Transit Delay = 79 ns


Pxl timing there are two asynchronous systems

PXL initial startup timing

Send start

PXL RDO tx

MTB buffering

Ladder sensor

Delay until frame starts

Ladder sensor

First frame latency

Delay until past frame header

MTB buffering

RDO board rx

Sensor frame begin tx

RDO board

Serdes processing

We will measure the full latency through the system from the transmission of the START to the arrival of the first frame header at the RDO board


Pxl timing there are two asynchronous systems

LVDS measured on one side of termination resistor.

Blue trace – falling edge of START measured at RDO board R34

Yellow trace – Sensor1 data output 1 (opposite polarity) measured on RDO board R1.

First frame latency = 7.093 us