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1.7.1 Port A Signals
General-
Purpose
Name
Peripheral Controller:
Dedicated Signal
I/O
Protocol
PA31
FCC1: TXENB
UTOPIA master
FCC1: TXENB
UTOPIA slave
FCC1: COL
MII
PA30
FCC1: TXCLAV
UTOPIA slave
FCC1: TXCLAV
UTOPIA master , or
FCC1: TXCLAV0
UTOPIA master, Multi-PHY,
direct polling
FCC1: RTS
HDLC, Serial and Nibble
FCC1: CRS
MII
Communications Processor Module (CPM) Ports
Table 1-3. Port A Signals
Dedicated
I/O Data
Direction
Output
FCC1: UTOPIA Master Transmit Enable
In the ATM UTOPIA interface supported by FCC1, TXENB
is asserted by the MSC8101 (UTOPIA master PHY) when
there is valid transmit cell data (TXD[0–7]).
Input
FCC1: UTOPIA Slave Transmit Enable
In the ATM UTOPIA interface supported by FCC1, TXENB
is asserted by an external UTOPIA master PHY when there
is valid transmit cell data (TXD[0–7]).
Input
FCC1: Media Independent Interface Collision Detect
In the MII interface supported by FCC1, COL is asserted by
an external fast Ethernet PHY.
Output
FCC1: UTOPIA Slave Transmit Cell Available
In the ATM UTOPIA interface supported by FCC1, TXCLAV
is asserted by the MSC8101 (UTOPIA slave PHY) when the
MSC8101 can accept one complete ATM cell.
Input
FCC1: UTOPIA Master Transmit Cell Available
In the ATM UTOPIA interface supported by FCC1, TXCLAV
is asserted by an external UTOPIA slave PHY to indicate
that it can accept one complete ATM cell.
Input
FCC1: UTOPIA Master Transmit Cell Available
Multi-PHY Direct Polling
In the ATM UTOPIA interface supported by FCC1,
TXCLAV0 is asserted by an external UTOPIA slave PHY
using direct polling to indicate that it can accept one
complete ATM cell.
Output
FCC1: Request To Send
In the standard modem interface signals supported by
FCC1 (RTS, CTS, and CD). RTS is asynchronous with the
data. RTS is typically used in conjunction with CD. The
MSC8101 FCC1 transmitter requests the receiver to send
data by asserting RTS low. The request is accepted when
CTS is returned low.
Input
FCC1: Media Independent Interface Carrier Sense
In the MII interface supported by FCC1. CRS is asserted by
an external fast Ethernet PHY. It indicates activity on the
cable.
Description
1-19
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