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18 MSC8101ADS RevB User’s Manual MOTOROLA
Hardware Preparation
2•3•1 Setting The Core Supply Voltage Level
The internal Logic & PLL’s of the MSC8101 is powered separately through a supply bus named
1V5. The voltage level over this power bus may vary between 0.9V - 2.1V. In the lower voltage
level, the Processor will operate at lower frequency range, consuming a smaller amount of power
and vice-versa for the higher voltage level.
1V5 power level is factory set for 1.5V, but may be changed by RP2.
2•3•2 Setting MODCK(1:3) For Initial PLLs’ Multiplication Factor - SW9
During Power On reset sequence the Processor samples the three MODCK(1:3) lines which are
driven by Altera FPGA device in accordance with SW9/1-3 setting. MODCK_HI field (MODCK[4–
6]), taken from the reset configuration word, are read from the Flash memory (default value from
Altera FPGA for non-programmed Flash is read from SW9/4-6) or from Host Interface to establish
with the multiplication factors of the CPM’s and Core’s PLLs. SW9 is shown in FIGURE 4-4 "Switch
SW9 MODCK - Description" on page 29:
Some Clock Configuration can see in FIGURE 5-1 on page 43:
2•3•3 Setting HReset Configuration Source
The HReset Configuration Word
A
, read by the Processor while HRESET~ is asserted, may be
taken from three sources:
1) Flash Memory SIMM.
2) Altera FPGA (Safe Mode).
3) Host I/F.
When SW9/7 is OFF, the Hard Reset Configuration Word is taken from Altera FPGA, when it is
ON, the Hard Reset Configuration Word is taken from the Flash SIMM. If SW9/8 (Configuration)
set OFF the Processor will be configured from Host, independent of SW9/7 (Flash Configuration
Enable) position. For correct operation for Host Config. Mode Data bus width will be set to 32-bit
wide.
A. In fact 8 Hard-Reset configuration words are read by a configuration master, however only the first is rel-
evant for a single MSC8101.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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