GS6151 datasheet(29/77 Pages) SEMTECH

29 / 77 page

GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

29 of 77

Semtech

Proprietary & Confidential

www.semtech.com

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

connected in Loop-Through configuration.

For read operations, the SDOUT pin is used to output data read from an internal

Configuration and Status Register (CSR) when CS is LOW. Data is shifted out of the

device on the falling edge of SCLK, so that it can be read by the host processor or other

downstream connected device on the subsequent SCLK rising edge.

4.11.3.1 GSPI Link Disable Operation

It is possible to disable the direct SDIN to SDOUT (Loop-Through) connection by writing

a value of 1 to the GSPI_LINK_DISABLE bit in REGISTER_0. When disabled, any data

appearing at the SDIN pin will not appear at the SDOUT pin and the SDOUT pin is HIGH.

Note: Disabling the Loop-Through operation is temporarily required when initializing

the Unit Address for up to 32 connected devices.

The time required to enable/disable the Loop-Through operation from assertion of the

parameter tcmd_GSPI_config (5 SCLK cycles).

Figure 4-6: GSPI_LINK_DISABLE Operation

4.11.3.2 GSPI Bus-Through Operation

Using GSPI Bus-Through operation, the GS6151 can share a common PCB trace with

other GSPI devices for SDOUT output.

When configured for Bus-Through operation, by setting GSPI_BUS_THROUGH_ENABLE

bit to 1, the SDOUT pin will be high-impedance when the CS pin is HIGH.

When the CS pin is LOW, the SDOUT pin will be driven and will follow regular read and

write operation as described in Section 4.11.3.

Table 4-7: GSPI_LINK_DISABLE Bit Operation

Bit State

Description

SDIN pin is looped through to the SDOUT pin

Data appearing at SDIN does not appear at SDOUT, and SDOUT pin is HIGH.

SDIN pin

SDOUT pin

GSPI_LINK

_DISABLE

GSPI_BUS_

THROUGH_ENABLE

CS pin

High-Z

Configuration and

Status Register

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