Quatech 802.11B/G manual SPI Protocol, SPI Read/Write Timing

Airborne Enterprise Module Databook						Quatech, Inc.
		Table 13 - SPI AC Timings
	Symbol	Parameter	Min	Typ	Max		Units
	fMAX	Maximum Clock Frequency			8.00		MHz
	tCS	SPI Select Low to Clock Rising Edge	100				ns
	tCH	Clock High	62.5				ns
	tCL	Clock Low	62.5				ns
	tDA	Clock High to Data Out			60		ns
	tDS	Clock Low to Data In Valid Set-up time	14				ns
	tDH	Clock Low to Data Valid Hold time	2				ns
	tCSH	Clock Falling Edge to SPI Select High	100				ns
	tDELAY	SPI Select High to SPI Select Low	40				ns

Figure 3 - SPI Read/Write Timing

Figure 4 - SPI Clock and Select Timing

7.3SPI Protocol

A SPI message is composed of a 4 byte header followed by 0 or more bytes of data. The header data is full-duplex. That is, the Tx message header is sent to

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