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Signal Descriptions
Table 5-11. PM3 Interconnect Signals (Continued)
PIN
MOTHERBOARD
SIGNAL
61
E_CLSN
62
E_RENA
63
SPARE2
64
VDOEN
65
GND
66
67
SYSCLK
68
GND
69
70
71
PA3
72
GND
73
74
PA2
75
PB17
76
PB18
77
E_TENA
78
GND
79
—
80
81
82
ETHEN
83
—
84
IRD_EN
5-26
DAUGHTERBOARD
INPUT/
SIGNAL
OUTPUT
E_CLSN
E_RENA
—
—
GND
SYSCLK
GND
PA3
GND
PA2
PB17
PB18
E_TENA
GND
—
ETHEN
—
IRD_EN
MPC821FADS-DB USER'S MANUAL
DESCRIPTION
I/O, H
Ethernet Port Collision signal. It is connected to
the serial communication controller's CTS
signal. When the Ethernet port is disabled via
the BCSR1, this signale can be used off-board
for another function.
I/O, H
Ethernet Receive Enable signal. It is
connected to the serial communication
controller's CD signal. It is active when there is
network activity. When the Ethernet port is
disabled via the BCSR1, this signal can be
used off-board for another function.
I/O, X
Spare line 2. Pulled up, but otherwise unused
on the this board.
O, L
Unused on this board.
—
I, X
System Clock signal. CLKOUT on the
MPC821.
—
I/O, X
Port A Bit 3. Also appears at P8, but is
otherwise unused.
—
I/O, X
Port A Bit 2. Also appears at P8, but is
otherwise unused.
I/O, X
Port B Bit 17. Also appears at P8, but is
otherwise unused.
I/O, X
Port B Bit 18. Also appears at P8, but is
otherwise unused.
I/O, H
Ethernet Port Transmit Enable signal. It is
connected to the serial communication
controller's RTS signal. When this signal is
active, transmit is enabled via the MC68160
EEST. When the Ethernet port is disabled via
the BCSR1, this signal can be used off-board
for another function.
—
Not connected.
—
O, L
Ethernet Port Enable signal. It is connected to
the BCSR1.
—
Not connected.
O, L
Infra-Red Enable signal. It is connected to the
BCSR1.
MOTOROLA
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