GS6151 datasheet(37/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

37 of 77

Semtech

Proprietary & Confidential

www.semtech.com

Figure 4-17: GSPI Write Timing – Auto-Increment with GSPI Link Disable Operation

Figure 4-18: GSPI Write Timing – Auto-Increment with Bus-Through Operation

Figure 4-19: GSPI Read Timing – Auto-Increment Read with Loop-Through Operation (default)

Figure 4-20: GSPI Read Timing – Auto-Increment Read with Bus-through Operation

4.11.9 Setting a Device Unit Address

Multiple (up to 32) GS6151 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 DEVICE_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 DEVICE_UNIT_ADDRESS of devices in a chain to

values other than 0:

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

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

disables the direct SDIN->SDOUT non-clocked path for all devices on chip select.

SCLK

SDIN

SDOUT

COMMAND

DATA 1

DATA 2

SCLK

SDIN

SDOUT

COMMAND

DATA 1

DATA 2

High-Z

SCLK

SDIN

SDOUT

COMMAND

DATA 1

DATA 2

SCLK

SDIN

SDOUT

COMMAND

DATA 1

DATA 2

High-z

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