C167CS datasheet(314/517 Pages) INFINEON

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C167CS

Derivatives

The Bootstrap Loader

User’s Manual

15-4

V2.0, 2000-07

Memory Configuration after Reset

The configuration (i.e. the accessibility) of the C167CS’s memory areas after reset in

bootstrap loader mode differs from the standard case. Pin EA does not select the code

source in BSL mode, and accesses to the internal code memory are partly redirected,

while the C167CS is in BSL mode (see Table 15-1). All code fetches are made from the

special Boot-ROM, while data accesses read from the internal code memory. Data

accesses will return undefined values on ROMless devices.

Note: The code in the Boot-ROM is not an invariant feature of the C167CS. User

software should not try to execute code from the internal ROM area while the BSL

mode is still active, as these fetches will be redirected to the Boot-ROM.

The Boot-ROM will also “move” to segment 1, when the internal ROM area is

mapped to segment 1.

Table 15-1

BSL Memory Configurations

BSL mode active

Yes

EA pin

high

low

acc. to application

Code fetch from

internal ROM area

Boot-ROM access

User ROM access

Data fetch from

internal ROM area

User ROM access

MCA04383

Int.

RAM

Access to

int. ROM

enabled

Access to

external

bus

disabled

16 MBytes

MCA04384

Int.

RAM

Access to

int. ROM

enabled

Access to

external

bus

enabled

16 MBytes

MCA04385

Int.

RAM

Depends

on reset

config.

Depends

on reset

config.

(EA, P0)

16 MBytes

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