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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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W6100 데이터시트(PDF) 76 Page - WIZnet Co., Ltd |
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W6100 데이터시트(HTML) 76 Page - WIZnet Co., Ltd |
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76 / 149 page  W6100 – Hardwired Dual TCP/IP Stack Controller 76/149 5.1.1.3 Data Phase The length of data phase is selected among N-byte(VDM) or 1,2,4 bytes(FDM) which is designated in SPI operation mode bits(OM[1:0]) of control phase. Data is transferred through MOSI or MISO signal from MSB to LSB sequentially. 5.1.2 Variable Length Data Mode (VDM) In this mode, the data phase length of SPI Frame is determined by CSn which is controlled by the HOST. The OM[1:0] of control phase must be set to ’00’ value for VDM mode 5.1.2.1 Write Access in VDM Figure 9 shows the SPI frame and SPI signals in write access. In the VDM, CSn(High-to-Low) by HOST informs the start of SPI frame and CSn(Low to High) by HOST informs the end of SPI Frame to W6100. In the control phase, RWB is "1" to indicate write access and OM[1:0] is "00" to indicate VDM. The data bits transmitted through MOSI are synchronized to the SCLK (Falling-Edge). If more than one byte of data is transmitted continuously, it supports sequential data write. Figure 9 Write SPI Frame in VDM |
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