GS6151 datasheet(38/77 Pages) SEMTECH

38 / 77 page

GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

38 of 77

Semtech

Proprietary & Confidential

www.semtech.com

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

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

unique Unit Address. This configures DEVICE_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 DEVICE_UNIT_ADDRESS value 0.

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

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

unique Unit Address value.

Note: tcmd_GSPI_conf delay must be observed after every write that modifies

HOST_CONFIG.

All connected devices receive this command (by default the Unit Address of all devices

is 0), and the Loop-Through operation will be re-established for all connected devices.

Once configured, each device will only respond to Command Words with a

UNIT ADDRESS field matching the DEVICE_UNIT_ADDRESS in HOST_CONFIG

Note: Although the Loop-Through and Bus-Through configurations are compatible

with previous generation GSPI enabled devices (backward compatibility), only devices

supporting Unit Addressing can share a chip select. All devices on any single chip select

must be connected in a contiguous chain with only the last device's SDOUT connected

to the application host processor. Multiple chains configured in Bus-Through mode can

have their final SDOUT outputs connected to a single application host processor input.

4.11.10 Default GSPI Operation

By default at power up or after a device reset, the GS6151 is set for Loop-Through

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

Figure 4-21 shows a functional block diagram of the Configuration and Status Register

(CSR) map in the GS6151 for non-extended memory accesses (EMEM = 0).

Figure 4-21: Internal Register Map Functional Block Diagram

[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 = 00h

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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