Quatech 802.11B/G Spezifikationen PDF herunterladen (Seite 41)

100-8004-102G Airborne Wireless LAN Node Module Data Book

Page 35

Quatech, Inc. Confidential

5.1 OVERVIEW

This chapter defines the DPAC Technologies Airborne SPI Module interface. The Host SPI

interface is based on the Motorola SPI industry standard, which does not provide anything

beyond a physical protocol.

5.2 SPI STANDARD SUPPORT SUMMARY

The SPI Module (WLN) supports Serial Peripheral Interface (SPI) data communications. SPI is

an industry standard, synchronous, serial link. The SPI interface is for devices that operate at

the higher data rates (see the Motorola standard for the full requirements).

The WLN operates as an SPI Slave device.

5.3 SPI HARDWARE CONFIGURATION

The Slave's MOSI needs to be setup by the Master on the first-edge (rising if Idle = Low, falling

if Idle = High) following the assertion of /SS. Therefore, the Slave will sample its MOSI on the

second-edge (transition).

The bit ordering of data coming into the SPI Slave is MSB-first for both transmit and receive.

Figure 11. SPI Data Clock Timing

(Note additional information in section “2.9.2 SPI Design Guidelines” on page 20.)

CHAPTER 5

SERIAL PERIPHERAL INTERFACE

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 66 67

Keine Kommentare

Quatech 802.11B/G Spezifikationen Seite 41