GS3281 datasheet(56/97 Pages) SEMTECH

56 / 97 page

GS3281

Final Data Sheet

Rev.7

PDS-061453

January 2019

56 of 97

Semtech

Proprietary & Confidential

www.semtech.com

4.9.13.1 Host Initiated Device Reset Timing Sequence

The following timing sequence must be observed after a Host Initiated Device Reset

when no external configuration loading is required. See Figure 4-28 for the timing

requirements of the Steps 1 to 3 below.

Step 1 – GSPI Access Allowed

a) Host writes 0xAD00 to register 0x007F to reset selected devices, or all devices using

broadcast.

Step 2– No GSPI Access Allowed

a) Internal blocks reset, default device configuration boot-up begins.

b) Default device configuration boot-up completes.

Step 3 – GSPI Access Allowed

a) Host sets EYE_MON_INT_CFG_3 (register address 0x57) to 0x8006.

b) If there are multiple devices on the GSPI chain, host must reconfigure unit address

of each device that was reset. See Section 4.9.9 for further information on unit

addressing.

c) Host sets custom application specific settings.

d) Normal operation begins.

Figure 4-28: Host Initiated Device Reset Timing Sequence.

5.11 ms – No GSPI Access Allowed

All blocks reset.

All devices that

received reset

command will

have their unit

address reset to

After Completion of Reset, device

automatically initiates default

configuration boot-up.

Eye Monitor

Reset:

Host

writes 0x8006

to register 0x57

at unit address

Command will

be broadcast to

all devices that

were reset.

Normal Operation Begins.

Host must reconfigure the unit addresses of

devices that were reset to 0.

After which, the host may read/write any

use broadcast write to concurrently write a

command to all devices on the GSPI chain.

Application Defined GSPI Read/Write

Access.

Eye

Monitor

Reset.

Default

Configuration

Boot-Up

Complete.

5 ms

110 μs

Internal Reset

Sequence

Complete.

Host writes

0xAD00 to

to reset device.

Host may reset

all devices by

using broadcast

mode.

GSPI Access.

Device

Configuration

Booting.

Device Blocks

Resetting.

GSPI Access Allowed

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