Motorola MSC8101 ADS User's Guide Page 59

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Configuring a Multi-MSC8101 System, PowerPC Bus Connected
Reset Configuration and Boot 2-7
2.3 Configuring a Multi-MSC8101 System, PowerPC Bus
Connected
This section describes a system of up to eight MSC8101s that connect to a PowerPC bus.
The reset configuration and boot process occur via the PowerPC bus. In such a system, an
EPROM or other standard memory device usually serves the reset and the boot process.
This memory device also connects to the PowerPC bus. The input clock operates at 10
MHz, and the required system clocks are the CPM clock at 150 MHz, the PowerPC bus
clock at 100 MHz, and the SC140 core clock at 300 MHz.
One of the MSC8101 devices acts as a reset configuration master for the reset
configuration process, and the rest are slaves. A reset configuration word for each
MSC8101 in the system is stored at a known address in the memory device. The reset
configuration master reads the first reset configuration word, configures itself, and then
reads the other configuration words to configure the rest of MSC8101s. This process is
described in detail in the following sections.
After exiting reset, each MSC8101 boots from a different address in order to provide
maximum system flexibility. After reset, the MSC8101 accesses the external memory
device to perform the boot routine. Each MSC8101 can access a unique address to
perform its own boot routine. Table 2-4 and Figure 2-4 describe the MSC8101 pins and
system connectivity.
Table 2-4. Pin Connectivity for a Multi-MSC8101 System, PowerPC Bus Connected
Pin/Function Connection
All PORESET
External reset
HRESET Connected among themselves and pulled up, if a simultaneous out of reset is
required. As long as one of the chips is still in the reset condition, HRESET
is
asserted and does not allow the others to exit reset.
DBREQ/EE0 To GND for normal operation of the core
HPE/EE1 To GND to disable the host port
BTM[0–1]/EE[4–5] To GND to enable boot from external memory or to V
CC
to enable boot from
the HDI16
RSTCONF
Configuration master MSC8101:
To GND
Configuration slave MSC8101s:
To one of A[0–6]
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