MYSON

TECHNOLOGY

MTD492

MTD492 Revision 3.5 01/07/1997

7/8

Collision Frequency (CD+)

Fcp

8.5

10

12.5

MHz

Collision Pulse Width (CD+)

Tcp

405060

ns

Extended Collision Detection Time (Note 6)

Tcxd

100

200

300

ms

CD Heartbeat Delay (TX+ to CD+)

Thon

0.6

1.1

1.6

µs

CD Heartbeat Duration(CD+)

Thw

0.5

1.0

1.5

µs

Jabber Activation Delay(TX+ to CD+)

Tja

202632

ms

Jabber Reset Time-out (TX+ to TXO and CD+)

Tjr

300

420

550

ms

Notes: 4. For a minimum pulse amplitude of > -300 mV.

5. IDL detection precedes the transmission turn-off by transmission propagation delay.

6. Time needed to detect an extended period of collision in order to turn off the reception path.

7.0 TIMING DIAGRAM

INPUT

TO RXI

RX+

RX-

T

ron

50%

50%

T

10%

T

rf

T

rr

T

roff

Figure 1. Reception Timing

TX+

TX-

TXO

OUTPUT

T

tst

T

toff

T

tidl

V

ts

T

ton

T

td

T

tf

T

tr

50%

50%

90%

10%

Figure 2. Transmission Timing

T

hon

T

hw

TX+

TX-

CD+

CD-

Figure 3. Heartbeat Timing

V

T

con

V

-1.75V

0V

-6.8V

-1.2V

T

coff

1/F

cp

T

cp

INPUT

to RXI

CD+

CD-

Figure 4. Collision Timing