TC1736 Datasheet, PDF (33/123 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1736
Introduction
2.4.7 Data Access Overlay
The data overlay functionality provides the capability to redirect data accesses by the
TriCore to program memory (internal Program Flash or external memory) to the Overlay
SRAM in the PMU, or to the Emulation Memory in Emulation Device ED. This
functionality makes it possible, for example, to modify the application’s test and
calibration parameters (which are typically stored in the program memory) during run
time of a program. Note that read and write data accesses from/to program memory are
redirected.
Attention: As the address translation is implemented in the DMI, it is only effective
for data accesses by the TriCore. Instruction fetches by the TriCore or
accesses by any other master (including the debug interface) are not
affected!
Summary of Features and Functions
• 16 overlay ranges (“blocks”) configurable for Program Flash and external memory
• Support of 4 Kbyte embedded Overlay SRAM (OVRAM) in PMU
• Support of up to 256 Kbyte overlay/calibration memory in Emulation Device (EMEM)
• Support of Online Data Acquisition into range of up to 32 KB and of its overlay
• Support of different overlay memory selections for every enabled overlay block
• Sizes of overlay blocks selectable from 16 byte to 2 Kbyte for redirection to OVRAM
• Sizes of overlay blocks selectable from 1 Kbyte to 128 Kbyte for redirection to EMEM
• All configured overlay ranges can be enabled with only one register write access
Data Sheet
29
V1.1, 2009-08