TC1797 datasheet(30/190 Pages) INFINEON

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TC1797

Introduction

Data Sheet

V1.1, 2009-04

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 0-1 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.

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