TC1797_14 Datasheet, PDF (30/192 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1797
Introduction
2.3.6.2 Overlay RAM and Data Acquisition
The overlay memory OVRAM is provided in the PMU especially for redirection of data
accesses to program memory to the OVRAM by using the data overlay function. The
data overlay functionality itself is controlled in the DMI module.
For online data acquisition (OLDA) of application or calibration data a virtual 32 KB
memory range is provided which can be accessed without error reporting. Accesses to
this OLDA range can also be redirected to an overlay memory.
2.3.6.3 Emulation Memory Interface
In TC1797 Emulation Device, an Emulation Memory (EMEM) is provided, which can fully
be used for calibration via program memory or OLDA overlay. The Emulation Memory
interface shown in Figure 4 is a 64-bit wide memory interface that controls the CPU-
accesses to the Emulation Memory in the TC1797 Emulation Device. In the TC1797
production device, the EMEM interface is always disabled.
2.3.6.4 Tuning Protection
Tuning protection is required by the user to absolutely protect control data (e.g. for
engine control), serial number and user software, stored in the Flash, from being
manipulated, and to safely detect changed or disturbed data. For the internal Flash,
these protection requirements are excellently fulfilled in the TC1797 with
• Flash read and write protection with user-specific protection levels, and with
• dedicated HW and firmware, supporting the internal Flash read protection, and with
• the Alternate Boot Mode.
Special tuning protection support is provided for external Flash, which must also be
protected.
2.3.6.5 Program and Data Flash
The embedded Flash modules of PMU0 includes 2 Mbyte of Flash memory for code or
constant data (called Program Flash) and additionally 64 Kbyte of Flash memory used
for emulation of EEPROM data (called Data Flash). The Program Flash is realized as
one independent Flash bank, whereas the Data Flash is built of two Flash banks,
allowing the following combinations of concurrent Flash operations:
• Read code or data from Program Flash, while one bank of Data Flash is busy with a
program or erase operation.
• Read data from one bank of Data Flash, while the other bank of Data Flash is busy
with a program or erase operation.
• Program one bank of Data Flash while erasing the other bank of Data Flash, read
from Program Flash.
Data Sheet
26
V1.3, 2014-08