Nortel Networks MSC8101 ADS user manual Fethtxen PB29, Fethrxer PB28, Fethcol PB27, Fethcrs PB26

Models: MSC8101 ADS

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

TABLE B1-3. P2 - CPM Expansion - Interconnect Signals

Pin No.

Signal Name

Attribute

Description

 

 

 

 

 

 

 

 

C3

FETHTXEN (PB29)

I/O, T.S.

Fast-Ethernet Transmit Enable (H). The MSC8101 will assert

 

 

 

(High) this line, to indicate data valid on the FETHTXD(3:0) lines.

 

 

 

When the Fast-Ethernet port is disabled, this line may be used for

 

 

 

any available function of PB29.

 

 

 

 

C4

FETHRXER (PB28)

I/O, T.S.

Fast-Ethernet Receive Error (H). When this signal is asserted

 

 

 

(High) by the LXT970, while the Ethernet port is enabled and

 

 

 

FETHRXCK goes high, it indicates that the port is receiving

 

 

 

invalid data symbols from the network.

 

 

 

When the Ethernet port is disabled, this line is tristated and may

 

 

 

be used for any available function of PB28.

 

 

 

 

C5

FETHCOL (PB27)

I/O, T.S.

Fast-Ethernet Port Collision Detected (H). When this signal is

 

 

 

asserted (High) by the LXT970, while the ethernet port is enabled,

 

 

 

it indicates a Collision state over the line. When the LXT970 is in

 

 

 

Full-Duplex mode, this line is inactive.

 

 

 

When the Ethernet port is disabled, this line is tristated and may

 

 

 

be used for any available function of the PB27.

 

 

 

 

C6

FETHCRS (PB26)

I/O, T.S.

Fast-Ethernet Carrier Sense (H). When this signal is asserted

 

 

 

(High), while the Ethernet port is enabled and the LXT970 is in

 

 

 

half-duplex mode, it indicates that either the transmit or receive

 

 

 

media are non-idle. When the LXT970 is in either full-duplex or

 

 

 

repeater operation, it indicates that the receive medium is non-

 

 

 

idle.

 

 

 

When the Ethernet port is disabled, this line may be used for any

 

 

 

available function of PB26.

 

 

 

 

C7

FETHTXD3 (PB25)

I/O, T.S.

Fast Ethernet Transmit Data (3:0). This is the MII transmit data

 

 

 

bus. The MSC8101 drives these lines according to rising edge of

C8

FETHTXD2 (PB24)

 

 

FETHTXCK.

 

 

 

When the ethernet port is disabled, these lines may be used for

C9

FETHTXD1 (PB23)

 

 

any available respective function.

 

 

 

C10

FETHTXD0 (PB22)

 

 

 

 

 

 

C11

FETHRXD0 (PB21)

I/O, T.S.

Fast Ethernet Receive Data (3:0). This is the MII receive data

 

 

 

bus. The LXT970 drives these lines according to rising edge of

C12

FETHRXD1 (PB20)

 

 

FETHRXCK.

 

 

 

When the ethernet port is disabled, these lines are tristated and

C13

FETHRXD2 (PB19)

 

 

may be used for any available respective parenthesized function.

 

 

 

C14

FETHRXD3 (PB18)

 

 

 

 

 

 

B-86

MSC8101ADS RevB User’s Manual

MOTOROLA

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Nortel Networks MSC8101 ADS Fethtxen PB29, Fethrxer PB28, Fethcol PB27, Fethcrs PB26, FETHTXD3 PB25, FETHTXD1 PB23