User's Manual

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HW Design Guidelines
Signal lengths on the modules are tuned as below:
Function
Net
Length (mil)
SGMII
SGMII_TX_P
617.11
SGMII_TX_M
642.13
SGMII_RX_P_C+SGMII_RX_P
661.40
SGMII_RX_M_C+SGMII_RX_M
675.06
2.5. UIM interface
M18QF/M18QA Series modules provide an UIM_DETECT input pin for UIM connector to
detect UIM card. When UIM card is present, UIM_DETECT should be high (1.8V). If UIM card
is absent, UIM_DETECT should be low. Its required to pull UIM_DETECT to VREF with a 470k
resistor.
A 0.1μF and a 33pF capacitor are recommended to place between UIM_VCC and Ground in
parallel. A 33pF capacitor is recommended to place between UIM_RESET, UIM_CLK and
UIM_DATA and Ground in parallel, see Figure5 for reference.
Electrostatic discharge (ESD) protection circuit is also recommended to place near the UIM
socket as close as possible, and the Ground pin of the ESD protection component must be
well connected to the Ground plane.
The following figure shows an example of UIM card circuit.