GS3471 datasheet(102/179 Pages) SEMTECH

102 / 179 page

GS3471

Final Data Sheet Rev.4

PDS-060498

September 2017

102 of 179

Semtech

www.semtech.com

4.22.10 Default GSPI Operation

By default at power up or after a device reset, the GS3471 is set for Loop-Through

Operation and the internal DEVICE_UNIT_ADDRESS field of the device is set to 0.

Figure 4-67 shows a functional block diagram of the Configuration and Status Register

(CSR) map in the GS3471 for non-extended memory accesses (EMEM = 0).

Figure 4-67: Internal Register Map Functional Block Diagram

The steps required for the application host processor to write to the Configuration and

Status Registers via the GSPI, are as follows:

1. Set Command Word for write access (R/W = 0) to the local registers 0h to 80h; set

Auto Increment; set the Unit Address field in the Command Word to match the

configured DEVICE_UNIT_ADDRESS which will be zero. Write the Command

Word.

2. Write the Data Word to be written to the first register.

3. Write the Data Word to be written to the next register in Auto Increment mode, etc.

Read access is the same as the above with the exception of step 1, where the Command

Word is set for read access (R/W = 1).

Note: The UNIT ADDRESS field of the Command Word must always match

DEVICE_UNIT_ADDRESS for an access to be accepted by the device. Changing

DEVICE_UNIT_ADDRESS to a value other than 0 is only required if multiple devices are

connected to a single chip select (in Loop-Through or Bus-Through configuration.)

[12]

[6:0]

Reg 0

Compare

Configuration and Status Registers

Read/Write

Reg 1

Reg 128

CMD

At power-up or after a device reset, DEVICE_UNIT_ADDRESS = 00

Data to be written / Read Data

DATA

[15:0]

[11:7]

[13]

[14]

bits

Local Address

R / W

Unit Address

BCAST

ALL

Auto

Inc

EMEM

[15]

DEVICE_UNIT_ADDRESS

GSPI_LINK

_DISABLE

GSPI_BUS_

THROUGH

_ENABLE

RESERVED

bits

[4:0]

[13]

[14]

[15]

32 devices

128 registers

bits

RESERVED

[12:5]

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