GS3470 datasheet(90/169 Pages) SEMTECH

90 / 169 page

GS3470

Final Data Sheet

Rev.8

PDS-060500

September 2017

90 of 169

Semtech

www.semtech.com

4.20.5.2 B'CAST ALL - B14 Command Word

This bit is used in write operations to configure all devices connected in Loop-Through

and Bus-Through configuration with a single command.

When B’CAST ALL is set to 1, the following Data Word (AUTOINC = 0) or Data Words

(AUTOINC = 1) are written to the register specified by the ADDRESS field of the

Command Word (and subsequent addresses when AUTOINC = 1), regardless of the

setting of the UNIT ADDRESS(es).

When B’CAST ALL is set to 0, a normal write operation is indicated. Only those devices

that have a Unit Address matching the UNIT ADDRESS field of the Command Word write

the Data Word to the register specified by the ADDRESS field of the Command Word.

4.20.5.3 EMEM - B13 Command Word

When the EMEM bit is 1 the Address Word is extended to 23 bits to allow access to

registers located in the extended memory space.

When the EMEM bit is 0, the address word is limited to 7 bits.

4.20.5.4 AUTOINC - B12 Command Word

When AUTOINC is set to 1, Auto-Increment read or write access is enabled.

In Auto-Increment Mode, the device automatically increments the register address for

each contiguous read or write access, starting from the address defined in the ADDRESS

field of the Command Word.

The internal address is incremented for each 16-bit read or write access until a

low-to-high transition on the CS pin is detected.

When AUTOINC is set to 0, single read or write access is required.

Auto-Increment write must not be used to update values in HOST_CONFIG.

4.20.5.5 UNIT ADDRESS - B11:B7 Command Word

The 5 bits of the UNIT ADDRESS field of the Command Word are used to select one of 32

devices connected on a single chip select in Loop-Through or Bus-Through

configurations.

Read and write accesses are only accepted if the UNIT ADDRESS field matches the

programmed DEVICE_UNIT_ADDRESS in HOST_CONFIG.

By default at power-up or after a device reset, the DEVICE_UNIT_ADDRESS is set to 00h

4.20.5.6 ADDRESS - B6:B0 Command Word

If the extended memory is not being accessed (EMEM = 0), the 7 bits of the ADDRESS

field are used to select one of 128 register addresses in the device in single read or write

access mode, or to set the starting address for read or write accesses in Auto-Increment

mode.

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