GS3590 datasheet(69/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

69 of 118

Semtech

Proprietary & Confidential

www.semtech.com

Figure 4-35: GSPI Write Timing—Auto-Increment with Bus-Through Operation

Figure 4-36: GSPI Read Timing—Auto-Increment Read with Loop-Through Operation (default)

Figure 4-37: GSPI Read Timing—Auto-Increment Read with Bus-through Operation

4.10.9 Setting a Device Unit Address

Multiple (up to 32) GS3590 devices can be connected to a common Chip Select (CS) in

Loop-Through or Bus-Through operation.

To ensure that each device selected by a common CS can be separately addressed, a

unique Unit Address must be programmed by the host processor at start-up as part of

system initialization or following a device reset.

Note: By default at power-up or after a device reset, the DEV_UNIT_ADDRESS of each

device is set to 0h and the SDINSDOUT non-clocked loop-through for each device is

enabled.

These are the steps required to set the DEV_UNIT_ADDRESS of devices in a chain to

values other than 0:

1. Write to Unit Address 0 selecting CONTROL_REG (ADDRESS = 0), with the

GSPI_LINK_DISABLE bit set to 1 and the DEV_UNIT_ADDRESS field set to 0. This

disables the direct SDIN

SDOUT non-clocked path for all devices on chip select.

2. Write to Unit Address 0 selecting CONTROL_REG (ADDRESS = 0), with the

GSPI_LINK_DISABLE bit set to 0 and the DEV_UNIT_ADDRESS field set to a

unique Unit Address. This configures DEV_UNIT_ADDRESS for the first device in

the chain. Each subsequent such write to Unit Address 0 will configure the next

device in the chain. If there are 32 devices in a chain, the last (32nd) device in the

chain must use DEV_UNIT_ADDRESS value 0.

3. Repeat step 2 using new, unique values for the DEV_UNIT_ADDRESS field in

CONTROL_REG until all devices in the chain have been configured with their own

unique Unit Address value.

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA 1

DATA 2

High-Z

COMMAND WORD 2

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA 1

DATA 2

COMMAND WORD 2

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA 1

DATA 2

High-z

COMMAND WORD 2

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