GS3590 datasheet(61/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

61 of 118

Semtech

Proprietary & Confidential

www.semtech.com

4.10 GSPI Host Interface

The GS3590 is configured 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 GS3590 is a slave device, so 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.

4.10.1 CS Pin

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

GS3590.

The HIGH-to-LOW transition of this pin marks the start of serial communication to the

GS3590.

The LOW-to-HIGH transition of this pin marks the end of serial communication to the

GS3590.

Each device may use its own separate Chip Select signal from the host processor or up

to 32 devices may 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 GSPI Command

Word 1 will respond to communication from the host processor (unless the B’CAST ALL

bit in GSPI Command Word 1 is set to 1).

4.10.2 SDIN Pin

The SDIN pin is the GSPI serial data input pin of the GS3590.

The 32-bit Command and 16-bit 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.

4.10.3 SDOUT Pin

The SDOUT pin is the GSPI serial data output of the GS3590.

All data transfers out of the GS3590 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

Word portion for read operations from the device. This allows multiple devices to be

connected in Loop-Through configuration.

GS3590 Datasheet(PDF) 61 Page - Semtech Corporation

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