GS6151 datasheet(22/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

22 of 77

Semtech

Proprietary & Confidential

www.semtech.com

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 2h.

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 17h. The AUTO_PWRDN_MODE bit in the same

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 D2h 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 930mVpp 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.

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