GS6151 Datasheet, PDF (22/77 Pages) Semtech Corporation – Multi-Rate 6G UHD-SDI

When this signal is HIGH, the data rate is 270Mb/s (SD) or 125Mb/s (MADI). This signal is
LOW for all other supported data rates, and when the GS6151 is operating in Bypass
Mode or any time the device is not locked.
The LBR_HBR output signal is available on either of the GPIO[0:1] multifunction status
and control pins. It is selected for output using the GPIO[0:1]_IO_SELECT and
GPIO[0:1]_SELECT bits accessible in the GPIO_CONTROL_REG_0 register at address 2_h.
4.4 Low Power Modes
The device can be programmed via the GSPI to operate in two different low power
modes. SLEEP mode has minimum power consumption at the expense of recovery time
upon de-assertion of the FORCE_PWRDN_SLEEP bit. STANDBY mode has higher power
consumption relative to SLEEP mode but minimizes time to return to operation on
de-assertion of the FORCE_PWRDN_STANDBY bit. The features affected by each mode
are outlined below.
SLEEP mode:
• LOS detection remains functional
• The GSPI remains functional
• The reference oscillator remains functional
STANDBY mode:
• LOS detection remains functional
• The GSPI remains functional
• The reference oscillator remains functional
• The VCO and PLL remains functional so as to minimize the lock time when a signal is detected
• The rate detector remains set to the last valid data rate. On detection of a signal, the
last valid rate is tested first by the rate detect state machine
The device can be programmed to automatically enter into SLEEP or STANDBY mode
when LOS is asserted by programming the AUTO_PWRDN_DISABLE bit in the
PWRDN_CONTROL register at address 17_h. The AUTO_PWRDN_MODE bit in the same
register selects which mode, SLEEP or STANDBY, is entered into upon assertion of LOS.
The device also features a power-save feature that reduces power when the CDR is
locked to HD, 3G or 6G rates. The HS_LOCKED_POWER_SAVE parameter of register
PWR_CONTROL at address D2_h can be set to 1 to enable this feature.
4.5 Serial Data Output
The GS6151 has two current-mode differential output drivers, each capable of driving
up to 930mV_pp differential into an external 100Ω differential load.
The output drivers operate with any binary coded signal with supported data rates up
to 5.94Gb/s. This is applicable to both the serial data (DDO, DDO, DDO1, DDO1) outputs
of the device.
GS6151
Final Data Sheet
PDS-060389
Rev.4
August 2015
www.semtech.com
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Semtech
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