Signal Descriptions
MOTOROLA
MPC821FADS-DB USER’S MANUAL
5-19
38
VFLS1
VFLS1
I/O
Visible History Flushes Status 1 signal. IP_B1/
IWP1/VFLS1 on the MPC821. In conjunction
with VFLS0, this signal indicates the number of
instructions flushed from the core’s history
buffer. It also indicates whether the MPC821 is
in debug mode. If you are not using the debug
port, this signal can be configured for another
function.
39
GND
GND
—
40
41
42
VF1
VF1
—
Visible Instruction Queue Flushes Status 1
signal. IP_B5/LWP1/VF1 on the MPC821. This
signal can be configured to another function if
you are not using it on the MPC8xxFADS.
43
GND
GND
—
44
AT1
AT1
—
Address Type 1 signal. ALE_B/DSCK/AT1 on
the MPC821. Not used on this board. May be
configured for another function.
45
GND
GND
—
46
AT0
AT0
I
Address Type 0 signal. IP_B6/DSDI/AT0 on
the MPC821.
47
GND
GND
—
48
POE_A
POE_A
I, L
PCMCIA Buffers Output Enable signal. The
OP1 signal of the PCMCIA interface. Enables
address buffers towards the PC card.
49
GND
GND
—
50
51
52
BADDR30
BADDR30
I/O,X
Burst Address line 30. Dedicated for external
master support. Used to generate a burst
address during external master burst cycles.
Pulled up, but otherwise unused on this board.
53
GND
GND
—
54
ALE_A
ALE_A
I, H
Address Latch Enable signal for PCMCIA Slot
A. Latches the address in external latches at
the beginning of an access to a PC card.
55
GND
GND
—
56
BADDR29
BADDR29
I/O,X
Burst Address line 29. Dedicated for external
master support. Used to generate a burst
address during external master burst cycles.
Pulled up, but otherwise unused on this board.
57
GND
GND
—
58
AS
AS
I/O, L
Address Strobe signal. When asserted by the
external master, the MPC821 recognizes that
an asynchronous cycle is in progress. Pulled
up, but otherwise unused on this board.
59
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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