ADFS5758 datasheet(53/75 Pages) AD

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Data Sheet

ADFS5758

Rev. 0 | Page 53 of 75

Shared/SYNC Autostatus Readback Mode

The shared SYNC autostatus readback is a special version of the

autostatus readback mode used to avoid SDO bus contention

when multiple ADFS5758 devices are sharing the same SYNC

line (whereby ADFS5758 devices are distinguished from each

other using the hardware address pins). After each valid write

to a device, a flag is set. On the subsequent falling edge of

SYNC, the flag is cleared. This mode behaves in a similar

manner to the normal autostatus readback mode, except that

the device does not output the status register contents on SDO

as SYNC goes low, unless the internal flag is set (that is, the

previous SPI write was valid). See the example shown in Figure 91.

Echo Mode

Echo mode behaves in a similar manner to the autostatus

readback mode, except that every second readback consists of

an echo of the previous command written to the ADFS5758.

This echo mode is useful to check which SPI instruction was

received in the previous SPI frame.

SYNC

ASSUME SHARED SYNC

AUTOSTATUS READBACK

IS ALREADY ENABLED

FOR BOTH DUTS

SDI

SDO

SCLK

24/

VALID WR TO DEVICE 0

24/

DEVICE 0

FLAG SET

VALID WR TO DEVICE 1

DEVICE 1

FLAG SET

INVALID WR TO DEVICE 0

VALID WR TO DEVICE 0

DEVICE 0 STATUS REG

DEVICE 1 STATUS REG

NO FLAG SET

DEVICE 0

FLAG SET

24/

DEVICE 0 STATUS REG

VALID WR TO DEVICE 1

DEVICE 1

FLAG SET

Figure 91. Shared/SYNC Autostatus Readback Example

PREVIOUS COMMAND

STATUS REGISTER CONTENTS

PREVIOUS COMMAND

Figure 92. SDO Contents—Echo Mode

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