Signal Descriptions
5-20
MPC821FADS-DB USER’S MANUAL
MOTOROLA
60
MODCK1
MODCK1
I/O
Mode Clock 1 signal. OP2/MODCK1/STS on
the MPC821. Used at power-on reset.
61
GND
GND
—
62
RESETA
RESETA
I,H
Reset signal for PCMCIA port A.
63
GND
GND
—
64
65
66
BADDR28
BADDR28
I/O,X
Burst Address line 28. Dedicated for external
master support. Used to generate a burst
address during external master burst cycles.
Pulled up, but otherwise unused on this board.
67
GND
GND
—
68
TEXP
TEXP
X,X
Timer Expired signal. Not used on this board.
69
GND
GND
—
70
WAIT_B
WAIT_B
I/O, L
Wait signal for PCMCIA Slot B. Pulled up, but
otherwise unused on this board.
71
GND
GND
—
72
MODCK2
MODCK2
I/O
Mode Clock 2 signal. OP3/MODCK2/DSDO on
the MPC821. Used at power-on reset as
MODCK2 and configured afterwards as OP3.
This signal can be configured for another
function.
73
GND
GND
—
74
75
76
—
—
—
Not connected.
77
GND
GND
—
78
79
80
SRESET
SRESET
I/O, L, OD
Soft Reset signal. This signal is driven by
onboard logic and may be driven by offboard
logic with open-drain gate only.
81
GND
GND
—
82
PORST
PORST
X, L
Power-On Reset signal. Not used on the
MPC8xxFADS, but generated on the
daughterboard.
83
GND
GND
—
84
HRESET
HRESET
I/O, L, OD
Hard Reset signal. This signal is driven by
onboard logic and may be driven by offboard
logic with open-drain gate only.
85
GND
GND
—
Table 5-10. PM2 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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