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5 – Serial Peripheral Interface

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

Page 37

Quatech, Inc. Confidential

5.4.2 SPI Write Configuration

This is an obsolete command and is no longer available.

5.4.3 SPI Write Data

The SPI Master may write data to the Slave with the Write Data command.

Write Data Command

Table 15. SPI Write Data Command

Command Length Value (0x80)

WDATA 1 Octet Bit 7 = 1

Bit 6 = 0

Bits 5:0 = 0 (reserved, must set to 0)

Response

Length (2 Octets) – This tells the Master the maximum number of octets that may be transmitted

to the Slave.

After the Response has been received by the Master, the Master should then begin data

transmission to the Slave.

Figure 13. Write Data Timing Diagram

Note:

• RFU means “Reserved for Future Use” – any value may be returned.

• The data sent by the Master to the Slave is only processed by the

Slave after /SS is de-asserted.

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