AMBE2000 datasheet(14/47 Pages) ETC

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AMBE-2000™ Vocoder Chip

User’s Manual Version 3.0

page 14

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Figure 3-B Hardware Reset Timing Diagram

Table 3-B Reset Timing Parameters

Reference

Parameter

Min

Max

Units

th(RS)

Hold time, RS after CLKOUT low

tw(RSL)

Pulse duration, RS low

µs

tsu(RS)

Setup time, RS before X2/CLKIN low

tsu(INT)

Setup time, INTn, NMI, RS before CLKOUT low

•

CLKOUT is shown for reference only. It should not be connected in the circuit.

3.4

Crystal / Oscillator Usage

The AMBE-2000™ Vocoder Chip has an input clock frequency of 16.384 MHz. Two options are outlined below in providing

this signal. The option used is specified by the CLOCK_MODE pin 51.

The following points should be noted when designing any printed circuit board layout:

•

Keep the crystal and external capacitors as close to the CLK_I and CLK_I2

pins as possible to minimize board stray capacitance.

•

Keep X2/CLKIN and X1 away from high frequency digital traces (example

CLKOUT) to avoid coupling.

3.4.1 TTL Clock Source

If CLOCK_MODE pin is low then a TTL/CMOS source is used as the clock input. Connect X2/CLKIN and X1 as follows:

w(RSL)

su(RS)

h(RS)

su(INT)

X2/CLKIN

RESETN

CLKOUT

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