GS3241 datasheet(61/108 Pages) SEMTECH

61 / 108 page

GS3241

Final Data Sheet

Rev.2

PDS-061444

September 2017

61 of 108

Semtech

Proprietary & Confidential

www.semtech.com

4.9.10 Default GSPI Operation

By default at power up or after a device reset, the GS3241 is set for Loop-Through

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

Figure 4-36 shows a functional block diagram of the Configuration and Status Register

(CSR) map in the GS3241.

Figure 4-36: 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 1 for write access (R/W = 0); set Auto Increment; set the Unit

Address field in the Command Word 1 to match the configured

DEV_UNIT_ADDRESS which will be zero after power-up. Set the Register Address

bits in Command Word 1 to match the upper 7 bits of the register address to be

accessed. Set the bits in Command Word 2 to match the lower 16 bits of the register

address to be accessed. Write Command Word 1 and Command Word 2.

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

Note: The UNIT ADDRESS field of Command Word 1 must always match

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

DEV_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).

Reg 0

Compare

Configuration and Status Registers

Read/Write

Data to be written / Read Data

DATA

[15:0]

DEV_UNIT_ADDRESS

GSPI_LINK

_DISABLE

GSPI_BUS_

THROUGH

_ENABLE

RESERVED

bits

[4:0]

[13]

[14]

[15]

bits

RESERVED

[12:5]

Lower 16 bits of Register Address

COMMAND 2

[15:0]

bits

[12]

[6:0]

COMMAND 1

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

[11:7]

[13]

[14]

bits

Upper 7 bits

R/W

Unit Address

32 devices

BCAST

ALL

Auto

Inc

EMEM

[15]

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