ETK-V1.1 - User’s Guide
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ETAS
Hardware Description
The ETK-V1.1 provides an extended trigger segment with up to 32 direct 16-bit
hardware triggers.
For ECU setup and debugging purposes, the ETK-V1.1 can be disabled by writing
an arbitrary value to the approriate address (ETK_Disable) in the trigger segment.
When disabled, write accesses to the ETK data emulation and measurement
memory are not performed (with exception to the trigger segment). The ETK-
V1.1 data lines are in tristate mode, even during read accesses. Writing to
ETK_Enable enables the ETK.
The disable/enable state is volatile, i.e. after power up, the ETK boots up in the
state defined by the "ETK Configuration Tool" (ETK state after power up).
4.5.4
Data Retention in Data Emulation Memory
The data emulation and measurement data memory physically consists of a static
Dual Port RAM and is permanently supplied with power from the car battery, to
guarantee that data is preserved even when the ignition is switched off. If the
ECU with ETK is isolated from the battery, all data will be lost.
4.6
Data Flash Memory
Flash memory is provided on the ETK-V1.1 for permanent storage of emulation
data. Users can copy the contents of the data emulation and measurement data
memory into the flash memory using the operating software. It is recommended
that an updated data set is always stored in the flash memory.
The ETK-V1.1 has a circuit which recognizes and stores power failures. If this
circuit detects power failures, and therefore a possible inconsistency of the emu-
lation data, the ETK microcontroller initiates a copying procedure from Flash
memory to DPR upon restart. The Flash memory data is copied to both emulation
pages. A green LED on the ETK displays the status. The operating software
announces the procedure by a message in the status line.
If the ETK-V1.1 is used as a normal RAM it may be useful that this copying pro-
cedure is switched off. This can be done by doing a write cycle to a dedicated
address in the trigger segment (trigger segment a 0x010h, see Fig. 4-9
"Division of the 256 Byte Trigger Segment"). The green LED on the ETK will be
switched off.
4.7
Code Flash Memory
The program code is not emulated by the ETK-V1.1. The program code is stored
in the ECU Flash memory ("on chip" and/or external) and is not modified by the
ETK-V1.1. Only the accessible emulation data areas are emulated by the ETK-
V1.1. The ECU Flash memory can be programmed with the normal Flash memory
programming tools.
Note
The unused address areas within the trigger segment are reserved for future
applications and must not be used for other purposes.
