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GS6151 Datasheet(PDF) 28 Page - Semtech Corporation |
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GS6151 Datasheet(HTML) 28 Page - Semtech Corporation |
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28 / 77 page  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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