Product Manual

Cambricon ®
Copyright © 2020 Cambricon Corporation
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Figure 5.2 MLU-LINK internal connection topology
MLU-LINK interconnection between extenders refer to the following figure:
Figure 5.3 External MLU-LINK connection reference
The signal rate of MLU-LINK is 50 Gbps, and the cable loss is controlled within 10 dB @12.5GHz.
It is recommended to use 1 meter cable with a diameter of 30 AWG or 2 meter cable with a diameter
of 28 AWG .
MLU-LINK interface uses QSFP DD connectors whose pins are defined as follows:
Table 5.2 MLU-LINK Interface pin definition
QSFP-DD pins
Note
Internal processing of
pins
RX [8:1]P/N
SERDES signal input with AC coupling
capacitance inside
External AC coupling
capacitance is not
required
TX [8:1]P/N
SERDES signal output with AC coupling
capacitance inside
External AC coupling
capacitance is not
required
SCL
I2C interface clock signal of optical module
4.7 KΩ pull-up to 3.3 V
SDA
I2C interface data signal of optical module
4.7 KΩ pull-up to 3.3 V
ModPrsL
Optical module in position signal output
4.7 KΩ pull-up to 3.3 V
ModSelL
Selection signal of optical module, default
pull- up inside
1KΩ pull-down to GND
ResetL
Reset signal, low level effective
4.7 KΩ pull-up to 3.3 V
IntL
Interrupt signal of optical module, OC gate,
low level indicates an interrupt signal
4.7 KΩ pull-up to 3.3 V
InitMode
Initialization mode
1KΩ pull-down to GND