GS3590 datasheet(18/118 Pages) SEMTECH

18 / 118 page

GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

18 of 118

Semtech

Proprietary & Confidential

www.semtech.com

4. Detailed Description

4.1 Device Description

The GS3590 features a 75Ω internally-terminated bidirectional SDIO port, which can be

set as SMPTE-compliant Cable Driver, or Cable Equalizer. In addition to the SDIO port,

there is a 100Ω differential Trace Driver to transmit the incoming SDI signal to the

system and a 100Ω differential Trace Equalizer to receive the outgoing signal from the

system. The bidirectional mode can be controlled through the host interface, or the

GPIO pin. The Cable Driver has amplitude and pre-emphasis control to compensate for

significant insertion loss between device output and BNC. The Trace Driver also has

amplitude and pre-emphasis control which can compensate for 15dB of insertion loss at

1.485GHz. The pre-emphasis control is two-dimensional in both the Cable Driver and

Trace Driver, where both pre-emphasis pulse amplitude and width adjustments can be

made to help optimize for interconnect mismatches such as vias and connectors. The

Trace Equalizer has boost control, which can compensate for 17dB of insertion loss at

1.485GHz.

4.1.1 Bidirectional Mode Control

The bidirectional mode of the GS3590 can be controlled through the GPIO or the host

interface.

By default the device is in pin control mode and GPIO3 is the control input pin. To put

the device in Cable Equalizer Mode drive this pin LOW. To put the device in Cable Driver

Mode drive this pin HIGH.

In addition to GPIO control, the host can set the direction mode through the host

interface using the CTRL_DIRECTION_SEL_MODE and CTRL_DIRECTION_SEL

parameters in register 0x14. To use the host interface to control the direction mode, first

choose host interface select mode by writing 1b to CTRL_DIRECTION_SEL_MODE

(default = 0b pin mode). Once the device is in host interface select mode, the host can

put the device in cable equalizer mode by writing 0b to the CTRL_DIRECTION_SEL

control parameter (default = 1b cable driver mode).

4.1.2 Sleep Mode

To enable low-power operation, the GS3590 has Manual and Automatic Sleep Mode

control.

The default mode is Automatic Sleep Mode on LOS (Loss Of Signal). The device can also

be manually put into Sleep Mode. When the device is in Sleep Mode, all the core blocks

are powered-down, except the host interface and carrier detect circuits. The SDIO Cable

Driver output buffer is always disabled (powered-down) in sleep mode, while the DDO

Trace Driver can be disabled or muted.

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