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DM9163

Layout Guide

Version: DM9163-LG-V10

May 5, 2014

6. Crystal Selection Guide

•

A crystal can be used to generate the 25MHz reference clock instead of an oscillator. The crystal must be a

fundamental type, series-resonant, connect to XT1 and XT2, and shunt each crystal lead to ground with a
22pF capacitor as shown in Figure 6.

PARAMETER SPEC

Type Fundamental,

series-resonant

Frequency

25 MHz +/- 0.01%

Equivalent Series Resistance

25 ohms max

Load Capacitance

22 pF typ.

Case Capacitance

7 pF max.

Power Dissipation

1mW max.

Table 6-1: Crystal Specifications

XT1

XT2

AGND

C18

22pf

25M

C19

22pf

Figure 6

Crystal Circuit Diagram

Содержание DM9163

Страница 1: ...DM9163 Layout Guide Version DM9163 LG V10 1 May 5 2014 DM9163 Layout Guide Version 1 0 Technical Reference Manual Davicom Semiconductor Inc May 5 2014 ...

Страница 2: ...t be placed near important signal traces such as RX receive pair and TX transmit pair band gap resistor magnetic and board edge Traces routed from the DM9163 RX pair to the 10 100M magnetic and the RJ45 connector should run symmetrically directly identically and closely no more than 2mm The same rule is applied to traces routed from the DM9163 TX pair Magnetic RJ 45 RX RX TX TX d1 d2 d1 d1 2mm d2 ...

Страница 3: ...he DM9163 RX and TX pairs to the RJ 45 Keep the two pairs away from all the other active signals and the chassis ground There should be no power or ground plane in the area under the network side of the 10 100M magnetic and the area under the RJ 45 connector Any terminated pins of the RJ 45 connector pins 4 5 7 and 8 see Figure 1 1 1 2 and the magnetic see Figure 1 1 1 2 should be tied as closely ...

Страница 4: ... Figure 1 1 and 1 2 illustrate the two types of the specific transformer interconnects and how to connect with Davicom DM9163 These two transformers are not pin to pin compatible and must be considered when using the DM9163 in auto MDIX mode Figure 1 1 Figure 1 2 DM9163 DM9163 3 3V 3 3V ...

Страница 5: ... less than 100mV peak to peak The 0 1 0 01μF decoupling capacitor should be connected between each DVDD DGND set and AVDD AGND set and be placed as close as possible to the power pins of DM9163 The conservative approach is to use two decoupling capacitors on each DVDD DGND set and AVDD AGND set One 0 1μF is for low frequency noise and the other 0 01μF is for high frequency noise on the power suppl...

Страница 6: ... could make the network interface card NIC not comply with specific regulations All AGND pins may not directly short each other see Figure 3 3 It must be directly connected to analog ground domain see Figure 3 2 Figure 3 1 Analog ground domain Digital ground domain AGND AGND AGND Good Analog ground domain Digital ground domain AGND AGND AGND Worse AGND direct short Figure 3 2 Figure 3 3 DM9163 ...

Страница 7: ...impedance 100Ω at 100MHz and direct current rating of 400mA and above A suitable bead is the Panasonic surface mound bead part number EXCCL4532U or an equivalent A 10μF 0 1μF and 0 01μF electrolytic bypass capacitors should be connected between VDD and GND at the device side of each of the ferrite bead Should separate analog power planes from noisy logic power planes Figure 4 DM9163 ...

Страница 8: ...ication The magnetics listed in the following table are electrical equivalents but may not be pin to pin equivalents Manufacturer Part Number MAGCOM HS9016 HS9024 Delta LFE8563 DC LFE8563T DC Table 5 1 10 100M Magnetics Sources Parameter Values Units Test Condition Tx RX turns ratio 1 1 CT 1 1 Inductance 350 μH Min Insertion loss 1 1 dB Max 1 100 MHz 18 dB Min 1 30 MHz 14 dB Min 30 60 MHz Return l...

Страница 9: ...sonant connect to XT1 and XT2 and shunt each crystal lead to ground with a 22pF capacitor as shown in Figure 6 PARAMETER SPEC Type Fundamental series resonant Frequency 25 MHz 0 01 Equivalent Series Resistance 25 ohms max Load Capacitance 22 pF typ Case Capacitance 7 pF max Power Dissipation 1mW max Table 6 1 Crystal Specifications 42 43 XT1 XT2 AGND AGND C18 22pf Y1 25M C19 22pf Figure 6 Crystal ...

Страница 10: ...as possible between the DM9163 and MAC controller Maximum length to be shorter than 20cm These MII signals are as follows CRS COL TXD3 TXD2 TXD1 TXD0 TXEN TXCLK TXER RXER RXCLK RXDV RXD0 RXD1 RXD2 RXD3 MDC MDIO TXD 0 3 and TXCLK length mismatch does not exceed 2cm RXD 0 3 and RXCLK length mismatch does not exceed 2cm All signal trace should be considered to have characteristic impedance of 50 Ohm ...

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