Nortel Networks MSC8101 ADS user manual BCSR1 Description, PON ATT DEF Atmrst, Fethien, Fethrst

Models: MSC8101 ADS

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Freescale Semiconductor, Inc.

 

 

Freescale Semiconductor, Inc.

 

 

 

 

Functional Description

 

 

 

 

TABLE 5-10. BCSR1 Description

 

 

 

 

 

 

 

BIT

MNEMONIC

Function

PON

ATT.

DEF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

ATM_RST

ATM Port Reset. When asserted (low), the ATM port transceiver is in reset

1

R,W

 

 

state. This line is driven also by HRESET~ signal of the MSC8101.

 

 

 

 

 

 

 

4

FETHIEN

Fast Ethernet Port Initial Enable. When asserted (low) the LXT970’s MII

1

R,W

 

 

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.

 

 

 

 

 

 

 

5

FETH_RST

Fast Ethernet port Reset. When active (low) the LXT970 is reset. This line

1

R,W

 

 

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.

 

 

 

 

 

 

 

6

RS232EN_1

RS232 port 1 Enable. When asserted (low) the RS232 transceiver for port

1

R,W

 

 

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.

 

 

 

 

 

 

 

7

RS232EN_2

RS232 port 2 Enable. When asserted (low) the RS232 transceiver for port

1

R,W

 

 

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.

 

 

 

 

 

 

 

a. See also TABLE 5-11. "Peripheral’s Availability Decoding."

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.

MOTOROLA

MSC8101ADS RevB User’s Manual

57

For More Information On This Product,

Go to: www.freescale.com

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Nortel Networks MSC8101 ADS user manual BCSR1 Description, PON ATT DEF Atmrst, Fethien, Fethrst