peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 108

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

Semiconductor Group
2.7
2.7.1
The DCU is responsible for the following tasks:
• DSP Address decoding
• Control of external memories
• Emulation support
• Interrupt handling and test support
• Data Bus and Program Bus arbitration
• DSP run time statistics
• Program write protection
• Boot support
2.7.2
The DCU decodes the DSP data address bus (DXAP) and the DSP program address
bus (PPAP) for performing the following tasks:
• Generating DSP memory mapped I/O read and write signals based upon decoding of
• Generating the circular buffer RAM read and write controls.
• Generating external program and data RAM controls upon detection of their address.
• Generating read signal for the internal program ROM.
Table 2-15 DSP Program Address Space
Address
0000
E000
F000
FE00
FF00
1)
the 8 MSB lines of the data address bus.
When accessing program memory, three more DSP cycles are added to the program read due to the
multiplexed nature of the external program/data bus.
H
H
H
H
H
-DFFF
-FDFF
-EFFF
-FFFF
-FEFF
DSP Control Unit (DCU)
General
DSP Address Decoding
H
H
H
H
H
Size
56 KW
4 KW
3.5 KW
0.25 KW
0.25 KW
Number of
Wait States
0 for read
3 for write
0 for read
3 for write
−
0
0
1)
1)
2-62
Description
External Program
Internal Program RAM (devided to
four) - Option For Future
implementation
Not used
Syne Table ROM
Internal Boot ROM
Functional Block Description
PEB 20560
2003-08