Motorola PPC/PMC-8260/DS1, Reference Manual, Page: 130 / 150

Resetting the Devices Memory Map and Devices
5 - 26 PPC/PMC-8260/DS1
Resetting the Devices
The PPC/PMC-8260/DS1 provides the possibility to reset the following devices in
case of a software hang:
•
PowerQUICC II
• I/O devices:
– Framers
– Agere T8105
– LED register
A reset of the PowerQUICC II does not reset the I/O devices and vice versa.
PowerQUICC II
To enforce a PowerQUICC II reset after a firmware or application software hang,
program the PowerSPAN II INT<5> signal from the PCI bus as follows:
1. On carrier board configure interrupt INT5 as output
Note: Mailbox registers 5, 6, and 7 are used by the firmware. Using these
PowerSpan II registers will cause firmware malfunction. Therefore, do not use
the mailbox registers 5, 6 and 7.
2. Set up one of PowerSpan II’s mailbox registers (except mailbox registers
5, 6, and 7 because they are used by the firmware) to trigger
PSPAN_INT5 for a minimum of 5 msec
3. Program access to respective mailbox register
The PowerQUICC II is then set into the RESET state (Powerup_RESET).