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WMS7204050S Datasheet(PDF) 10 Page - Winbond |
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WMS7204050S Datasheet(HTML) 10 Page - Winbond |
10 / 32 page WMS7204 - 10 - 7.5. DAISY CHAIN Multiple devices can be controlled by the same bus without the need for extra CS lines from the microcontroller by daisy chaining the devices with the SDO of the first device connected to SDI of the next device as shown in figure 3 FIGURE 3 – DAISY CHAIN CONFIGURATION A complete command is 24 bits including the instruction and the two data bytes. When shifting 24 bits in to the first device in the chain, the 24 bits of the previous command will be shifted out. So to set up two devices in a daisy chain, a total of 48 bits must be sent where the first 24 bits will be shifted out to the second device and the 24 bits shifted in last will remain in the first device. FIGURE 4 – DAISY CHAIN COMMAND EXAMPLE CS CLK SDO SDI SDO SDI SDO SDI SDO Device Device Device Micro controller CS CS CLK CLK CLK CS 1. Command and data for device 2 is shifted into device 1; this will propagate to Device 2 when the next 24 bits are shifted in. Command 1 Data 2 Data 2 xx xx xx Device Device 2. Command and data for device 1 is shifted into device 1. Now Device 1 and 2 are correctly set up Command 2 Data 1 Data 1 Command A Data 2 Data 2 Device Device VDD |
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