Spi bus for debug trace only, Pin description, Spi waveforms – Sierra Wireless AIRPRIME WISMO218 User Manual
Page 34: Figure 4, Spi timing diagrams, Table 6, Spi bus pin descriptions
WA_DEV_W218_PTS_002
Rev 006
April 29, 2010
34
Product Technical Specification &
Customer Design Guidelines
Interfaces
3.5. SPI Bus for Debug Trace ONLY
The AirPrime WISMO218 provides one SPI bus through the castellation pin.
3.5.1.
Pin Description
Table 6:
SPI Bus Pin Descriptions
Signal
Pin
Number
I/O
I/O Type
Reset State
Description
SPI-CLK
15
O
2V8
Pull down
SPI Serial Clock
SPI-IO
13
I/O
2V8
Pull down
SPI Serial input/output
SPI-O
14
O
2V8
Pull down
SPI Serial input
~SPI-CS
17
O
2V8
Pull up
SPI Enable
SPI-IRQ
25
I
2V8
Pull down
SPI Interrupt
By default, the AirPrime WISMO218 SPI interface is only used for monitoring trace for debug
purposes. An SPI-to-UART2 conversion circuit is required to convert the SPI trace to UART2. Also,
the SPI-IRQ (pin 25) is required for interrupt. Again, note that the SPI interface of the AirPrime
WISMO218 is not open for application use other than debug trace.
3.5.1.1.
SPI Waveforms
Figure 4. SPI Timing Diagrams