ML4642 datasheet(13/15 Pages) MICRO-LINEAR

13 / 15 page

ML4642

SQE TEST WHEN CASCADING

As mentioned before, after each transmission during the

interpacket gap time the collision signal will be activated

on the CDOUT pair of the same port as the TXIN pair

which received the packet. When cascading ML4642s to

implement 4 or 8 port designs, the path is remembered

and followed to acheive this function. The paths that did

not carry the transmit data blocks CDOUT for 4-7 µsec

after transmission to guarantee that only the port that

transmitted will see SQE test.

a type 2 configuration offers three options. In option 1,

when tied to +5 volts through a resistor and an LED, an

internal or external MAU will be connected. For stand-

alone operation without an internal or external MAU a

loopback is required. Option 2 allows loopback with no

SQE test while option 3 provides loopback with an SQE

test.

An eight port design is accomplished in the same way as

shown in the block diagram in Figure 11. In an eight port

design Type 0 and Type 2 configuration remain the same

as in a four port design. Type 1 however only differs from

Type 2 by tying RXLED/LPBK/SQE through a resistor to +5

volts. Table 1 summerizes all of the different LED

configurations.

TABLE 1. LED Configurations for 2, 4, and 8 Port Designs

JAB1/JABD

RXLED/LPBK/SQE

JAB2

CDLED

TXLED1

TXLED2

Two Port AUI Mux

LED

GND, 0.6V, LED

LED

Type 0

LED

270ý to +5V

LED

WIRE’ORED

LED

Type 1

GND

270ý to +5V

Type 2

GND

GND, 0.6V, LED

DTE PORT 1

DTE PORT 2

DTE PORT 3

DTE PORT 4

DTE PORT 5

DTE PORT 6

DTE PORT 7

DTE PORT 8

ML4642

MAU PORT

TYPE 0

TYPE 1

TYPE 2

Figure 11. Eight Port AUI Multiplexer

FUNCTIONAL DESCRIPTION

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