Signal Descriptions
5-26
MPC821FADS-DB USER’S MANUAL
MOTOROLA
61
E_CLSN
E_CLSN
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.
62
E_RENA
E_RENA
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.
63
SPARE2
—
I/O, X
Spare line 2. Pulled up, but otherwise unused
on the this board.
64
VDOEN
—
O, L
Unused on this board.
65
GND
GND
—
66
67
SYSCLK
SYSCLK
I, X
System Clock signal. CLKOUT on the
MPC821.
68
GND
GND
—
69
70
71
PA3
PA3
I/O, X
Port A Bit 3. Also appears at P8, but is
otherwise unused.
72
GND
GND
—
73
74
PA2
PA2
I/O, X
Port A Bit 2. Also appears at P8, but is
otherwise unused.
75
PB17
PB17
I/O, X
Port B Bit 17. Also appears at P8, but is
otherwise unused.
76
PB18
PB18
I/O, X
Port B Bit 18. Also appears at P8, but is
otherwise unused.
77
E_TENA
E_TENA
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.
78
GND
GND
—
79
—
—
—
Not connected.
80
81
82
ETHEN
ETHEN
O, L
Ethernet Port Enable signal. It is connected to
the BCSR1.
83
—
—
—
Not connected.
84
IRD_EN
IRD_EN
O, L
Infra-Red Enable signal. It is connected to the
BCSR1.
Table 5-11. PM3 Interconnect Signals (Continued)
PIN
MOTHERBOARD
SIGNAL
DAUGHTERBOARD
SIGNAL
INPUT/
OUTPUT
DESCRIPTION
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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