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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADFS5758 датащи(PDF) 53 Page - Analog Devices |
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ADFS5758 датащи(HTML) 53 Page - Analog Devices |
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53 / 75 page  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/ 32 1 24/ 32 1 VALID WR TO DEVICE 0 24/ 32 1 24/ 32 1 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/ 32 1 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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