GS2985 Datasheet, PDF (40/45 Pages) Gennum Corporation – Uses standard 27MHz crystal

4.16 Device Power-up
In host mode (HIF pin tied LOW), control & status registers (CSRs) may start up in a
random state. There is a bit in the command word RST which will reset the CSR when set
LOW.
In non-host mode (HIF pin tied HIGH), the HIF pin is used to trigger an internal reset
signal to place all registers in a deterministic, default state upon power-up.
In either host mode or non-host mode, other internal state machines (e.g. offset
correction and PLL) automatically recover from any state at start-up with no reset
required. It takes ~10μs for the device to lock after start-up.
4.17 Standby
The purpose of Standby mode is to allow operating power to be reduced when the
device's functionality is not required, and to have a rapid and simple transition to full
operation when the device is required.
In order to achieve this, the device can be powered-down by writing a ‘1’ to the ‘Power
Down’ bit located in register address 0x02.
GS2985 Multi-Rate SDI Reclocker with Equalization &
De-emphasis
Data Sheet
36663 - 5
July 2012
40 of 45
Proprietary & Confidential