Quatech WLNG-SP-DP500 Series Spécifications télécharger pdf (Page 23)

Airborne Enterprise Module Databook Quatech, Inc.

100-8080-110 8/11/2009 23

Table 13 - SPI AC Timings

Symbol

Parameter

Min

Typ

Max

Units

MAX

Maximum Clock Frequency

8.00

MHz

SPI Select Low to Clock Rising Edge

100

Clock High

62.5

Clock Low

62.5

Clock High to Data Out

Clock Low to Data In Valid Set-up time

Clock Low to Data Valid Hold time

CSH

Clock Falling Edge to SPI Select High

100

DELAY

SPI Select High to SPI Select Low

Figure 3 - SPI Read/Write Timing

Figure 4 - SPI Clock and Select Timing

7.3 SPI 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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Quatech WLNG-SP-DP500 Series Spécifications Page 23