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Communication Ports
for FCC1 and b00011 for FCC2. The MPC8272 interfaces this port using two PI/O pins:
PC18 for MDIO and PC19 for MDC. There is no special support within the MPC8272 for
the MDIO port and the protocol is implemented in S/W.
The MDIO port may interrupt a host in 2 ways: (a 1 ) driving low the MDIO line during
IDLE time or (b) using a dedicated interrupt line MDINT. This line is connected to the
MPC8272’s IRQ5 line, appearing also at the CPM expansion connectors.
Since IRQ5 may also be driven by any tool, connected to the expansion connectors, it
should be driven with an Open Drain buffer. IRQ5 is pulled-up on the board.
5.10.3 RS232 Ports
To assist user ’s applications and to provide convenient communication channels with both
a terminal and a host computer, two identical RS232 ports are provided on the
MPC8272ADS, connected to SCC1 and SCC4 ports of the MPC8272. Use is done with
MAX3241 transceiver which generates RS232 levels internally using a single 3.3V supply
and has a standby mode. When the RS232EN1 or RS232EN2 bits in BCSR1 are asserted
(low), the corresponding transceiver is enabled. When negated, the corresponding
transceiver is in standby mode, within which the receiver outputs are tri-stated, enabling the
use of the corresponding ports’ pins off-board via the expansion connectors.
Nine pins, female D-Type stacked connector is used, configured to be directly (via a flat
cable) connected to a standard IBM-PC like RS232 connector.
DCD
TX
TX
DTR
GND
1
2
3
4
5
6
7
8
9
DSR
RTS
CTS
N.C.
Figure 5-9. RS232 Serial Ports Connector
5.10.3.1 RS-232 Ports’ Signal Description
In the list below, the directions ’I’,’O’, and ’I/O’ are relative to the MPC8272ADS board.
(i.e.’I’ means input to the MPC8272ADS)
?
?
?
?
CD (O) - Data Carrier Detect. This line is always asserted by the MPC8272ADS.
TX (O) - Transmit Data.
RX (I) - Receive Data.
DTR (I) - Data Terminal Ready. This signal is used by the software on the
MPC8272ADS to detect if a terminal is connected to the board.
1 Not
supported on the board.
MPC8272ADS User Guide
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