DSP56011 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56011

24-BIT DVD DIGITAL SIGNAL PROCESSOR

Motorola => Freescale 

Specifications

External Clock Operation

EXTERNAL CLOCK OPERATION

The DSP56011 system clock is externally supplied via the EXTAL pin. Timings shown

in this document are valid for clock rise and fall times of 3 ns maximum. The 81 MHz

P R E L I M I N A R Y speed allows the DSP56011 to take advantage of the 27 MHz system clock in DVD

applications.

Table 2-5 External Clock (EXTAL)

81 MHz

95 MHz

No.

Characteristics

Sym.

Unit

Min Max Min Max

Frequency of external clock EXTAL

1 External clock input high—EXTAL

• With PLL disabled

(46.7%–53.3% duty cycle)

• With PLL enabled

(42.5%–57.5% duty cycle)

EF

0

81

0

ETH

5.8

∞

4.9

5.2 235500 4.5

2 External clock input low—EXTAL

• With PLL disabled

(46.7%–53.3% duty cycle)

• With PLL enabled

(42.5%–57.5% duty cycle)

ETL

5.8

∞

4.9

5.2 235500 4.5

3 External clock cycle time

• With PLL disabled

• With PLL enabled

ETC

12.3

∞

10.5

12.3 409600 10.5

4 Instruction cycle time = ICYC = 2 × TC

• With PLL disabled

• With PLL enabled

ICYC

24.7

∞

21.0

24.7 819200 21.0

Note: EXTAL input high and input low are measured at 50% of the input transition.

95 MHz

∞

ns

235500 ns

∞

ns

235500 ns

∞

ns

409600 ns

∞

ns

819200 ns

EXTAL

1

2

ETH

ETL

3

ETC

4

AA0250

Figure 2-1 External Clock Timing

Preliminary Information

MOTOROLA

DSP56011 Technical Data Sheet, Rev. 1

2-5

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