Quatech 802.11B/G Especificaciones descargar pdf (Pagina 27)

2 – Airborne Wireless LAN Node Module

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

Page 21

Quatech, Inc. Confidential

 The Configuration Status must be available to be shifted out of the MISO port at the

beginning of each command, requiring its update immediately at the end of a frame to be

prepared for the next frame.

 A pre-defined data frame has to be agreed upon by both the master and slave for the

exchange of data. The data frame is described by two parameters, the clock polarity and

the clock phase. These parameters have four possible states that correspond to four SPI

Modes.

Table 9. SPI Modes

SPI

Mode

Clock

Polarity

(CPOL)

Clock

Phase

(CPHA)

Clock (SCK) Idle

Low: Output on rising,

sample on falling

High: Output on falling,

sample on rising

Output

Sample

Edge

Input

Sample

Edge

0 0 0 Low Falling Rising

0 1 Low Rising Falling

2 1 0 High Rising Falling

3 1 1 High Falling Rising

 *The WLN SPI Slave shall run in Mode 1 only.

 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.

2.9.3 WLN UART Connections

For embedded applications that will communicate with the serial UART interface, the following

guidelines are also recommended:

 Connect HS.TXD (port F1) to the receive line of the embedded processor UART.

 Connect HS.RXD (port F7) to the transmit line of the embedded processor UART.

 Connect HS.RTS (port F4) and HS.CTS (port F5) if hardware handshaking is desired.

 Connect the CONNECT status line (port F6) to a digital input on the embedded

processor. This line indicates whether a TCP connection is active.

 Connection to the other status lines ⎯ POST, RF LINK, WLAN CFG LINK ⎯ is optional.

 If HS.RTS and HS.CTS (Ports F4 and F5) are not used, tie them to ground via 10 kΩ

resistors.

2.9.4 WLN SPI Connections

 Connect the application’s MOSI line to port F7 of the WLN to transfer data from the

Master.

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 66 67

Comentarios a estos manuales

Sin comentarios

Quatech 802.11B/G Especificaciones Pagina 27

Comentarios a estos manuales

Relacionado con productos y manuales para Servidores Quatech 802.11B/G