CS8952T datasheet(66/86 Pages) CIRRUS

66 / 86 page

DS206TPP2

CS8952T

CrystalLAN™ 100BASE-X and 10BASE-T Transceiver

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

ly) on both sides of the TX+/- traces.

Table 11. RJ-45 Wiring

•

No signal current carrying planes, i.e. no

ground or power plane, should be present un-

derneath the region between the transformer

secondary (network) side and the RJ-45. How-

ever,achassisplane maybeaddedinthisre-

gion to pick up the metal tabs of a shielded RJ-

45. This chassis plane should be separated from

the ground and power planes by at least

50 mils. That is, all other ground and power

planes should be “cookie cuttered” so they are

voided in the area of the chassis plane. Gener-

ally speaking, parts should not cross the moat

except for the transformer.

•

Proper termination practices must be used with

all transmission lines, especially if sending/re-

ceiving high speed signals. Series terminations

must be kept close to the source and load termi-

nations close to the load.

•

Locate the crystal as close to the CS8952T as

possible, running short traces on the compo-

nent side in order to reduce parasitic load ca-

pacitance.

•

Add bulk capacitance at each connector where

power may be supplied. For example, MII pow-

er may be provided at the MII connector and at

a separate connector for test purposes. If so,

and the two connectors are not adjacent, then

the bulk capacitors should be duplicated in each

locations.

•

Use wide traces to connect the unused pairs ter-

mination resistors at T1 and the RJ-45 to the

2 KV capacitor or capacitors in order to mini-

mize their lead inductance.

CS8952T Pin

Assignment

T1 Primary Pin

Assignment

T1 Secondary

Pin Assignment

RJ-45 Pin Assignment

Adapter/NIC

Configuration

Hub/Repeater

Configuration

91 (RX+)

1 (RX+)

7 (RX+)

3 (RD+)

1 (RD+)

92 (RX-)

2 (RX-)

6 (RX-)

6 (RD-)

2 (RD-)

81 (TX-)

16 (TX-)

10 (TX-)

2 (TD-)

6 (TD-)

80 (TX+)

15 (TX+)

11 (TX+)

1 (TD+)

3 (TD+)

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