4.5.1 Status Indicators
The state of the status monitors are accessible by reading registers through the serial interface or with dedicated pin (LOLb). Each of
the status indicator register bits has a corresponding sticky bit (_FLG) in a separate register location. Once a status bit is asserted its
corresponding _FLG bit will remain asserted until cleared. Writing a logic zero to a _FLG register bit clears its state.
Table 4.5. Status Monitor Bits (Si5341 and Si5340)
Setting Name Hex Address [Bit Field] Function
Status Register Bits
SYSINCAL 0x000C[0] Asserted when in calibration.
LOSXAXB 0x000C[1]
Loss of Signal at the XA input.
The XB input does not have an LOS detector.
LOSREF 0x000C[2] Loss of Signal for the input that has been selected.
LOL 0x000C[3] Loss of Lock for the PLL.
SMBUS_TIMEOUT 0x000C[5] The SMB bus has a timeout.
LOSIN[3:0] 0x000D[3:0] Loss of Signal for the FB_IN, IN2, IN1, IN0 inputs.
Sticky Status Register Bits
SYSINCAL_FLG 0x0011[0] Sticky bit for SYSINCAL
LOSXAXB_FLG 0x0011[1] Sticky bit for LOSXAXB
LOSREF_FLG 0x0011[2] Sticky bit for LOSREF
LOL_FLG 0x0011[3] Sticky bit for LOL
SMBUS_TIMEOUT_FLG 0x0011[5] Sticky bit for SMBUS_TIMEOUT
LOSIN_FLG 0x0012[3:0] Sticky bit for FB_IN, IN2, IN1, IN0
Si5341, Si5340 Rev D Family Reference Manual • Clock Inputs
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
20 Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 26, 2021 20
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