User Manual

Cinterion
®
ELS31-V/ELS51-V Hardware Interface Overview
2.1 Application Interface
17
 ELS31-V_ELS51-V_HIO_v00.502 2015-12-07
Confidential / Preliminary
Page 13 of 35
2.1.7 SPI Interface
Four ELS31-V / ELS51-V GPIO interface lines can be configured as Serial Peripheral Interface
(SPI). The SPI is a synchronous serial interface for control and data transfer between ELS31-
V / ELS51-V and the external application. Only one application can be connected to the SPI
and the interface supports only master mode. The transmission rates are up to 6.5Mbit/s. The
SPI interface comprises the two data lines MOSI and MISO, the clock line SPI_CLK a well as
the chip select lines SPI_CS1 and SPI_CS2.
2.1.8 Pulse Counter
The GPIO8 line can be configured as pulse counter line COUNTER. The pulse counter inter-
face can be used, for example, as a clock (for GPIOs see Section 2.1.5).
2.1.9 HSIC Interface (ELS51-V Only)
TBD
2.1.10 SDIO Interface (ELS51-V Only)
TBD
2.1.11 Control Signals
2.1.11.1 Status LED
The GPO5 interface line can be configured to drive a status LED that indicates different oper-
ating modes of the module (for GPIOs see Section 2.1.5). GPO and LED functionality are mu-
tually exclusive.
2.1.11.2 Fast Shutdown
The GPIO4 interface line can be configured as fast shutdown signal line FST_SHDN. The con-
figured FST_SHDN line is an active low control signal.