User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 UICC/SIM/USIM Interface
- 2.1.7 Digital Audio Interface
- 2.1.8 Pulse Code Modulation Interface (PCM)
- 2.1.9 Inter IC Sound Interface (I2S)
- 2.1.10 GPIO Interface
- 2.1.11 I2C Interface
- 2.1.12 SPI Interface
- 2.1.13 Pulse Counter
- 2.1.14 HSIC Interface (ELS51-VA Only)
- 2.1.15 SDIO Interface (ELS51-VA Only)
- 2.1.16 Control Signals
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 2.1 Application Interface
- 3 Operating Characteristics
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
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ELS31-VA/ELS51-VA Hardware Interface Description
3.2 Power Up/Power Down Scenarios
76
ELS31-VA_ELS51-VA_HID_v01.000 2017-01-04
Confidential / Preliminary
Page 62 of 106
3.2.3 Signal States after First Startup
Table 15 lists the states each interface signal passes through during reset and first firmware
initialization. For further firmware startup initializations the values may differ because of differ-
ent GPIO line configurations.
The reset state is reached with the rising edge of an internal reset line - either with a normal
module startup after about 26 milliseconds (see Section 3.2.1) or after a restart (see Section
3.2.2). After the reset state has been reached the firmware initialization state begins. The firm-
ware and command interface initialization is completed as soon as the ASC0 interface line
CTS0 has turned low (see Section 2.1.4). Now, the module is ready to receive and transmit data.
Abbreviations used in above Table 15:
Table 15: Signal states
Signal name Default functionality Reset state First start up configuration
CCIO I O / L
CCRST I O / L
CCCLK O / L O / L
CCIN I I / PD
RXD0 I / PU O / H
TXD0 I I
CTS0 I O / H
RTS0 I I / PD
GPIO1/DTR0 DTR0 T / PD I / PU
GPIO2/DCD0 DCD0 T / PD O
GPIO3/DSR0 DSR0 T / PD O
GPIO4/FST_SHDN GPIO4 I / PD I / PU
GPO5/LED LED I / PD O
GPIO6 GPIO6 I / PD I / PD
GPIO7 GPIO7 I / PU I / PD
GPIO8/COUNTER GPIO8 I I / PD
GPIO16/RXD1 GPIO16 I I / PU
GPIO17/TXD1 GPIO17 I /PU I / PU
GPIO18/RTS1 GPIO18 I /PU I / PU
GPIO19/CTS1 GPIO19 I /PU I / PU
GPIO20/PCM_I2S_OUT GPIO20 I I / PD
GPIO21/PCM_I2S_IN GPIO21 I I / PD
GPIO22/PCM_I2S_FSC GPIO22 I I / PD
GPO23/PCM_I2S_CLK GPO23 I O / L
GPIO24/RING0 RING0 T / PD O
GPIO25 GPIO25 I I / PD
GPO26/SPI_CS1 GPO26 I O
GPIO27/SPI_CS2 GPIO27 I I / PD
I2CCLK I / PD T / OD
I2CDAT I / PD T / OD
L = Low level
H = High level
T = Tristate
I = Input
O = Output
OD = Open Drain
PD = Pull down
PU = Pull up