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Birmingham Instrumentation Laboratory for Particle physics and Applications

QSFP

Birmingham Instrumentation Laboratory for Particle physics and Applications

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Using QSFP Transceivers with VPK120

General Resources

VPK120 Resources

GTM202/203/204/205: QSFP-DD Interface section in the User Guide.

I2C Control

The desired QSFP has to be first selected by pulling the corresponding MODSELL pin low. These are controllable via GPIO expander (TCA6416A) on I2C-0 bus address 0x20.

Pin 2 is QSFPDD1_MODSELL.
Pin 3 is QSFPDD1_MODSELL.

The QSFP I2C control is available via the I2C-1 bus on the processing system. It is connected to chanenl 6 of an TCA9548A multiplexer (address 0x74). See the I2C-1 section in the user guide.