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USB84604 데이터시트(PDF) 34 Page - Microchip Technology

부품명 USB84604
상세설명  USB 2.0 HSIC Hi-Speed 4-Port Controller Hub
PDF  61 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB84604 데이터시트(HTML) 34 Page - Microchip Technology

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USB84604
DS60001295C-page 34
 2014-2016 Microchip Technology Inc.
7.1.8
JEDEC-ID READ EXAMPLE
To perform a JEDEC-ID command, the device writes 0x9F into the first byte of the SPI_CMD_BUF. The length of the
transfer is 4 bytes. The device first drives SPI_CE_N low, then SPI_DO is output with 8 bits of the command, followed
by the 24 bits of dummy bytes (due to the length being set to 4). When the transfer is complete, SPI_CE_N goes high.
After the first byte, the data on SPI_DI is clocked into the SPI_RSP_BUF. At the end of the command, there are three
valid bytes in the SPI_RSP_BUF. In this example, 0xBF, 0x25, 0x8E.
FIGURE 7-4:
SPI COMMAND ONLY SEQUENCE
SPI_CE_N
SPI_CLK
12 3 4
05
7
6
SPI_DO
SPI_DI
Command
MSB
HIGH IMPEDANCE



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