SNLS589B September 2016 – July 2018 DS90UB960-Q1
RX port specific register. The FPD-Link III Port Select register 0x4C configures which unique Rx port registers can be accessed by I2C read and write commands.
|7:6||FREQ_HYST||R/W||0x3||Frequency Detect Hysteresis
The Frequency detect hysteresis setting allows ignoring minor fluctuations in frequency. A new frequency measurement will be captured only if the measured frequency differs from the current measured frequency by more than the FREQ_HYST setting. The FREQ_HYST setting is in MHz.
|5:4||FREQ_STABLE_THR||R/W||0x0||Frequency Stable Threshold
The Frequency detect circuit can be used to detect a stable clock frequency. The Stability Threshold determines the amount of time required for the clock frequency to stay within the FREQ_HYST range to be considered stable:
00 : 40us
01 : 80us
10 : 320us
11 : 1.28ms
|3:0||FREQ_LO_THR||R/W||0x5||Frequency Low Threshold
Sets the low threshold for the Clock frequency detect circuit in MHz. If the input clock is below this threshold, the NO_FPD3_CLK status will be set to 1.