peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 241

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

4.2.3.2
The data space is divided into a Y data space for the local YRAM, and a X data space
for the XRAM. The XRAM space is divided into local data RAM/ROM of 1 K or 2 K, and
an external space of 62 K or 60 K, respectively. The configuration is determined
according to a core input pin. The local YRAM space and the local XRAM space were
mapped to allow a continuous data space. The mapping is described in Figure 4-2. The
data space partition allows expansion of the local XRAM and YRAM, and at the same
time enables looking at the two RAMs as a single continuous data RAM. The XRAM and
YRAM can contain RAM or ROM. The X data memory can be expanded external (with
no additional wait state cycles) up to the YRAM boundary.
Memory-mapped I/O is used, thus several addresses of the data space locations may
be reserved for peripherals depending on the specific application configuration. Wait
states generation is possible.
The external space, within the XRAM space, may contain slow memories and
peripherals as well as fast memories and peripherals. When using slow memories,
additional wait cycles have to be inserted.
Figure 4-2
For more details on OAK architecture please refer to “DOC DSP Programmer’s
Reference Manual, 11.97”.
Semiconductor Group
Data Memory
Data Memory Map
External
YRAM
XRAM
XRAM
Local
Local
Option 1
FFFF
FC00 H
FBFF H
0400 H
03FF
0000 H
H
H
1 K Words
62 K Words
1 K Words
4-6
Option 2
FFFF H
F800
F7FF
0800
07FF
0000 H
H
H
H
H
2 K Words
60 K Words
2 K Words
ITD10228
DSP Core OAK
PEB 20560
2003-08