peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 116

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

Semiconductor Group
2.7.4
The CDI board communicates with the COMBO with two main interfaces:
• Control pins (BOOT, DBG, ABORTN, RSTN).
• C-bus interface (for Program RAM, Mail Box and Boot EPROM)
The control strap pins are inserted to the DCU which is responsible to send the right
signals to the OCEM module and the OAK Emulation interface pins.
The communication protocol between the debugger and the monitor program is not
protected from the case where user program, by mistake writes to the monitor space.
In such a case the monitor routine will be corrupted with no way to recover.
A write to the emulation mail box is prevented except for the following cases:
• During monitor routine (a write which is done by the emulator).
• During boot routine execution (code download).
2.7.5
The OAK user interrupts (INT0, INT1, INT2, NMI) are asserted by the DCU.
Usually, the sources for the interrupts are the functional blocks but for testing, there is a
way of inserting the interrupts from DOC input pins. Therefore, the interrupt sources are
as follows:
(TIF If the Test Flag - see the TESTCONF register).
Table 2-17 Interrupt Map
Interrupt
INT0
INT1
INT2
NMI
BI
Wait
Emulation Support
Interrupt Handling and Test Support
Source (TIF = 0)
PCM-DSP interface = FSC AD8
µP Mail Box
OCEM
DCU
2-70
Functional Block Description
Source (TIF = 1)
AD9
CS
WR
Abort
AD7
PEB 20560
2003-08