Motorola MSC8101 ADS User Manual page 57

BIT MNEMONIC
3 ATM_RST
4 FETHIEN
5 FETH_RST
6 RS232EN_1
7 RS232EN_2
TABLE 5-11. "Peripheral's Availability Decoding."
a. See also
b. The ATM transceiver itself does not enter standby mode, the fact that it is disconnected from
lates this state.
c. Required for voltage levels adaptation.
MOTOROLA
Freescale Semiconductor, Inc.
Functional Description
TABLE 5-10. BCSR1 Description
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.
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.
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.
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.
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.
MSC8101ADS RevB User's Manual
For More Information On This Product,
Go to: www.freescale.com
Function
PON
ATT.
DEF
1 R,W
1 R,W
1 R,W
1 R,W
1 R,W
the emu-
MSC8101
57