Sierra Wireless AirLink FXT Series Especificaciones descargar pdf (Pagina 24)

WA_DEV_FEX20_PTS_004 Rev 001 June 30, 2010 24

Expansion Card Product Technical

Specification

Interfaces

4.4. Serial Interface

The Expansion Card may be connected to an LCD driver through either of the two SPI bus interface.

4.4.1. SPI Bus

Both SPI bus interface includes:

 a CLK signal

 an I/O signal

 an I signal

 a CS signal complying with the standard SPI bus

4.4.1.1. Characteristics

The following lists the features available on the SPI bus:

 Master mode operation

 SPI speed is from 101.5 Kbit/s to 13 Mbit/s in master mode operation

 3 or 4-wire interface

 SPI-mode configuration: 0 to 3

 1 to 16 bits data length

4.4.1.2. Configuration

Table 12: SPI Bus Configuration

Operation

Maximum Speed

SPI-Mode

Duplex

3-wire Type

4-wire Type

Master

13 Mb/s

0,1,2,3

Half

SPIx-CLK; SPIx-IO;

~SPIx-CS

SPIx-CLK; SPIx-IO;

SPIx-I; ~SPIx-CS

Note that for the 4-wire configuration, SPIx-I/O is used as output only; and SPIx-I is used as input

only. For the 3-wire configuration, SPIx-I/O is used as both input and output.

4.4.1.3. Pin Description

Refer to the following tables for the pin description of both SPI bus interface.

Table 13: SPI1 Bus Pin Description

Number

Signal

I/O

I/O Type

Reset State

Description

Multiplexed

With

SPI1-CLK

2V8

SPI Serial Clock

GPIO28

SPI1-IO

I/O

2V8

SPI Serial input/output

GPIO29

SPI1-I

2V8

SPI Serial input

GPIO30

~SPI1-CS

2V8

SPI Enable

GPIO31

Refer to section 4.2 Electrical Information for Digital I/O for open drain, 2V8 and 1V8 voltage

characteristics and reset state definitions.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 59 60

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