GS6151 datasheet(28/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

28 of 77

Semtech

Proprietary & Confidential

www.semtech.com

4.11 GSPI Host Interface

The GS6151 is controlled via the Gennum Serial Peripheral Interface (GSPI).

The GSPI host interface is comprised of a serial data input signal (SDIN pin), serial data

output signal (SDOUT pin), an active-low chip select (CS pin) and a burst clock (SCLK

pin).

The GS6151 is a slave device, therefore the SCLK, SDIN and CS signals must be sourced

by the application host processor.

All read and write access to the device is initiated and terminated by the application

host processor.

It is strongly recommended to connect the GSPI pins of the GS6151 to a host/system

processor/controller or FPGA to facilitate optimization of the device to meet specific

application requirements. Modification of many device settings is only facilitated

through the GSPI of the GS6151, and is not available on external pins.

4.11.1 CS Pin

The Chip Select pin (CS) is an active-low signal provided by the host processor to the

GS6151.

The high-to-low transition of this pin marks the start of serial communication to the

GS6151.

The low-to-high transition of this pin marks the end of serial communication to the

GS6151.

There is an option for each device to use a separate unique Chip Select signal from the

host processor or for up to 32 devices to be connected to a single Chip Select when

making use of the Unit Address feature.

Only those devices whose Unit Address matches the UNIT ADDRESS in the GSPI

Command Word will respond to communication from the host processor (unless the

B’CAST ALL bit in the GSPI Command Word is set to 1).

4.11.2 SDIN Pin

The SDIN pin is the GSPI serial data input pin of the GS6151.

The 16-bit Command and Data Words from the host processor or from the SDOUT pin

of other devices are shifted into the device on the rising edge of SCLK when the CS pin

is low.

4.11.3 SDOUT Pin

The SDOUT pin is the GSPI serial data output of the GS6151.

All data transfers out of the GS6151 to the host processor or to the SDIN pin of other

connected devices occur from this pin.

By default at power up or after system reset, the SDOUT pin provides a non-clocked path

directly from the SDIN pin, regardless of the CS pin state, except during the GSPI Data

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