GS6152 Datasheet, PDF (27/80 Pages) Semtech Corporation – Multi-Rate 6G UHD-SDI

4.7 Bypass Mode
In CDR Bypass mode, the GS6152 passes the input data to the outputs, bypassing the
retiming functionality.
There are two bits in the control registers that control the bypass function:
MANUAL_BYPASS and AUTO_BYPASS in the CDR_BYPASS register at address 20_h. The
MANUAL_BYPASS bit is inactive (set to 0) by default. The AUTO_BYPASS bit is active (set
to 1) by default, and places the GS6152 CDR into bypass mode when the PLL is not
locked to a data rate. The bypass function does not affect the trace equalization function
of the device.
Note: If MANUAL_BYPASS is active, it overrides the AUTO_BYPASS bit setting.
4.8 DVB-ASI
The GS6152 has the ability to reclock DVB-ASI signals at 270Mb/s. All relevant settings
and control registers that apply to SD-SDI signals at 270Mb/s are also compatible with
DVB-ASI signals at 270Mb/s.
4.9 Device Power Up
4.9.1 Power on Reset (POR)
The GS6152 features an on-chip power-on-reset that places all registers and internal
state machines into their known, default states when the chip is powered up.
4.9.2 Reset Pin (RST)
When the RST pin is set LOW, all functional blocks are set to their default conditions and
high-speed data and digital functionality is suspended. When it is set HIGH, normal
operation of the device resumes 0.5ms after the LOW-to-HIGH transition of the signal.
This pin is not required at power up and may be left unconnected.
4.10 GPIO Pins Configuration
The GS6152 has four GPIO pins that can each be configured as outputs for various
internal status signals, or as inputs to disable either output-driver through pin control.
The bits GPIO[0:3]_IO_SELECT are used to configure the GPIO pins as outputs (0) or
inputs (1). The signals that are output or input on the GPIO pins are selected on
GPIO_CONTROL_REG_0 and GPIO_CONTROL_REG_1. The signals that can be output on
the GPIO pins are listed in Table 4-5 below.
GS6152
Final Data Sheet
PDS-060984
Rev.2
July 2015
www.semtech.com
27 of 80
Semtech
Proprietary & Confidential