W6100 datasheet(76/149 Pages) WIZNET

tên linh kiện	W6100

Giải thích chi tiết về linh kiện	Hardwired Dual TCP/IP Stack Controller

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W6100 – Hardwired Dual TCP/IP Stack Controller

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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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