MFC2000 datasheet(143/426 Pages) ETC

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Multifunctional Peripheral Controller 2000

MFC2000

100723A

Conexant

6-1

6. Fax Timing Control Interface

6.1

PLL

6.1.1

Description

The MFC2000 is an ASIC that provides multifunctional control for color fax, color scan and color printing. The

ASIC includes an ARM microprocessor running at 30 MHz, 37.5 MHz or 40 MHz and a Countach Imaging DSP

running at 100 MHz or 85.7 MHz. Additionally, the ASIC also supports the USB interface running at 48 MHz and

the AUXCLK at 10 MHz.

The PLL for the ASIC is designed to provide all the above frequencies in six operating modes based on the

combination of ARM frequency select and Countach Imaging DSP frequency select. The six operating modes are

defined in the following table.

6.1.2

Frequency Requirement

The frequencies for the six operation modes are defined as follows:

Table 6-1. Operation Mode Frequencies

CLKConfig[1:0]

CLKConfig[2]

ARM (SIUCLK)

Countach

USB

AUXCLK

30 MHz

85.7 MHz

48 MHz

10 MHz

37.5 MHz

85.7 MHz

48 MHz

10 MHz

40 MHz

85.7 MHz

48 MHz

10 MHz

30 MHz

100 MHz

48 MHz

10 MHz

37.5 MHz

100 MHz

48 MHz

10 MHz

40 MHz

100 MHz

48 MHz

10 MHz

Don’t Care

The MFC2000 can only operate in one mode at a time. The mode selection is made during the reset through

clock configuration pins (CLKConfig[2:0]). The input reference frequency is 28.224 MHz, which is generated by a

crystal oscillator pad. 28.224MHz is also used for the internal P80 modem DSP.

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