Spi Bus; Characteristics; Spi Configuration; Spi Waveforms - Sierra Wireless AirPrime AR7558 Hardware Integration Manual

Hardware Integration Guide

6.16. SPI Bus

The AirPrime AR7558 embedded module provides one SPI bus (4-wire interface).
SPI bus interface includes:

A CLK signal

An O signal

An I signal

A CS (Chip Select) signal

6.16.1. Characteristics

The following features are available on the SPI bus:

Master-only mode operation

SPI speed is from 128 kbit/s to 26 Mbit/s in master mode operation

4-wire interface

4 to 32 (TBD) bits data length.

6.16.2. SPI Configuration

Table 62. SPI Configuration
Operation
Master
For the 4-wire configuration, SPIx-I/O is used as output only, SPIx-I is used as input only (TBC by
firmware).

6.16.3. SPI Waveforms

The following figure shows waveforms for SPI transfer with 4-wire configuration.
Figure 25. 4-Wire Configuration SPI Transfer
4116922
Maximum Speed
26Mb/s
Rev 1.1
Duplex
SPI-Mode
0,1,2,3 full
Baseband Specification
4-wire Type
SPIx-CLK;
SPIx-IO;
SPIx-I;
SPIx_CS
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