Motorola MSC8101 ADS User Manual download pdf (Page 18)

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

, 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,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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Motorola MSC8101 ADS User Manual Page 18