... | @@ -17,22 +17,45 @@ backplane: |
... | @@ -17,22 +17,45 @@ backplane: |
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![](/uploads/d5b7c3a2ef26661a9c8b3d2e18f7fd4e/mini_backplane_diagram.jpg)
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![](/uploads/d5b7c3a2ef26661a9c8b3d2e18f7fd4e/mini_backplane_diagram.jpg)
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The mini-backplane can be split into 4 subblocks:
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The diagram contains 4 subblocks:
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\- MCH connector: a modified AMC right-angle connector (CN1) normally
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### MCH connector
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used to attach AMC cards onto AdvancedTCA blades. The PCB footprint has
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reversed pin order, so the MCH can be plugged in with the component side
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It's an AMC right-angle connector (CN1) typically used to attach AMC
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facing upwards (unlike the AMC cards, where the bottom side of the PCB
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cards onto AdvancedTCA blades. The PCB footprint has been modified
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is facing the top).
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(reversed pin order), so the MCH can be plugged in with the component
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side facing upwards (unlike AMC cards, where the bottom side of the PCB
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\- power supply: delivers +12 V / 3 A bulk power to the MCH (via a
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is facing the top). The AMC socket has the following MCH lines
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MOSFET switch controller by the watchdog MCU), +3.3 V / 3 A for the SFPs
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connected:
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and the backplane logic and +3.3 V / 200 mA microTCA management power.
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The 12 VDC is supplied from a separate AC power supply module.
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- \+12 V bulk power / +3.3 V management power and power enable pin
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- fabric A lanes 1-8: downlink ports
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\- SFP assemblies: SFP cages with I/O expanders and calibration
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- fast I2C bus (normally used as inter-MCH IPMB)
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buffers
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- reset and interrupt line (normally used as slot 6 IPMB)
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\- I2C logic: I2C hub and I/O expander.
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- calibration feedback input (normally used as MCH fabric update RX
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input)
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### Power supply
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The PSU takes +12 V input from an external AC power module via CN2 and
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provides:
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- \+12 V / 3 A bulk power for the MCH (via a MOSFET switch controlled
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by the watchdog MCU)
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- \+3.3 V / 3 A for the SFPs and the backplane logic
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- \+3.3 V / 200 mA microTCA management power.
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### SFP assemblies
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There are 8 SFP assemblies, each of them including:
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- an SFP socket
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- 2 status LEDs
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- calibration buffers for RX and TX lanes
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- I2C I/O expander for controlling the LEDs, cal. buffers and SFP
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lines
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Below there is a block diagram of a single SFP assemly:
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