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FT201XS-R 数据表(PDF) 34 Page - Future Technology Devices International Ltd. |
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FT201XS-R 数据表(HTML) 34 Page - Future Technology Devices International Ltd. |
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34 / 49 page  Copyright © 2014 Future Technology Devices International Limited 34 FT201X USB I2C SLAVE IC Datasheet Version 1.4 Document No.: FT_000627 Clearance No.: FTDI# 264 Further details of these states can be found in Chapter 9 of the USB 2.0 Specification from the USB Implementers Forum website (http://www.usb.org). Figure 9.6: Checking the USB State Device ID command This command uses the Slave address of the FT-X. The master issues the 1111 100 0 command (0x7c write) followed by the slave address with the direction bit as either 0 or 1 (don’t care). The master then sends a repeated start followed by the 1111 100 1 command (0x7c read). The FT-X responds with 3 bytes containing the manufacturer ID (12 bits), part ID (9 bits) and revision (3 bits). The master ends reading with a NACK. Note: In the case where the master keeps ACKing the data, it has to wrap around and the slave (the FT- X) will keep sending the 3 bytes of its ID. Figure 9.7: Reading the Device ID |
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