Nortel Networks MSC8101 ADS Manual Do Utilizador

MOTOROLA

57

Functional Description

3

ATM_RST

ATM Port Reset. When asserted (low), the ATM port transceiver is in reset
state. This line is driven also by HRESET~ signal of the MSC8101.

1

R,W

4

FETHIEN

Fast Ethernet Port Initial Enable. When asserted (low) the LXT970’s MII
port, residing on FCC2, is enabled after Power-Up or after FETH_RST is
negated. When negated (high), the LXT970’s MII port is isolated after
Power-Up or after FETH_RST is negated and all I/F signals are tri-stated. 
After initial value has been set this signal has no influence over the LXT970
and MII isolation may be controlled via MDIO 0.10 bit. The Fast Ethernet
Port on the FCC2 which lines are muxed with T1/E1 channels 2-4 and may
be available if they are tri-stated. See bit BCSR0/4 description.

1

R,W

5

FETH_RST

Fast Ethernet port Reset. When active (low) the LXT970 is reset. This line
is also driven by HRESET~ signal of the MSC8101. Since MDDIS pin of the
LXT970 is driven low with this application, the negation of this signal causes
all the H/W configuration bits to be sampled for initial values and device
control is moved to the MDIO channel, which is the control path of the MII
port.

1

R,W

6

RS232EN_1

RS232 port 1 Enable. When asserted (low) the RS232 transceiver for port
1 (upper), is enabled. When negated, the RS232 transceiver for port 1, is in
standby mode and SCC1 pins are available for off-board use via the
expansion connectors.

1

R,W

7 RS232EN_2

RS232 port 2 Enable. When asserted (low) the RS232 transceiver for port
2 (lower), is enabled. When negated, the RS232 transceiver for port 2, is in
standby mode and SCC2 pins are available for off-board use via the
expansion connectors.

1

R,W

a. See also 

b. The ATM transceiver itself does not enter standby mode, the fact that it is disconnected from 

MSC8101

 the emu-

lates this state.

c. Required for voltage levels adaptation.

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Freescale Semiconductor, Inc.

For More Information On This Product,

   Go to: www.freescale.com

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