Signal Descriptions
MOTOROLA
MPC821FADS-DB USER’S MANUAL
5-13
25
BCSRCS
BCSRCS
I/O, L
Board Control and Status Register Chip-Select
signal. CS1 on the MPC821. Used as the
chip-select for the BCSRs. Pulled up. When the
BCSR is removed from the local map, this
signal can be used off-board via the
daughterboard’s expansion connectors.
26
VCC
VCC
O
5V Bus
27
GPL5A
GPL5A
X,L
General-Purpose Line 5 of UPMA. Not used on
this board.
28
VCC
VCC
O
5V Bus
29
BI
BI
I/O,L
Burst Inhibit signal. Pulled up, but otherwise
unused on this board.
30
—
—
—
Not Connected. Reserved.
31
CS7
CS7
—
Chip-Select Line 7. Unused on this board.
32
GND
GND
—
MPC8xxFADS ground plane.
33
CS5
CS5
—
Chip-Select line 5. Unused on this board.
34
GND
GND
—
35
CE1A
CE1A
I, L
Card Enable 1 signal for PCMCIA Slot A.
Enables the even address bytes. Used by the
on-board PCMCIA port.
36
GND
GND
—
37
F_CS
F_CS
I/O, L
Flash Chip-Select signal. CS0 on the MPC821.
Used as chip-select for the Flash SIMM. Pulled
up. When the flash is disabled via the BCSR,
this signal can be used off-board via the
daughterboard’s expansion connectors.
38
GND
GND
—
39
CS6
CS6
—
Chip-Select line 6. Unused on this board.
40
GND
GND
—
41
CE2A
CE2A
I, L
Card Enable 2 signal for PCMCIA Slot A.
Enables the odd address bytes. Used by on-
board PCMCIA port.
42
GND
GND
—
43
DRMCS2
DRMCS2
I/O, L
DRAM Chip-Select 2 signal. CS3 on the
MPC821. Used as chip-select line for the
second bank of the DRAM SIMM. Pulled up.
When the DRAM is disabled via the BCSR or
when a single-bank DRAM SIMM is being
used, this signal can be used off-board via the
daughterboard’s expansion connectors.
44
GND
GND
—
45
DRMCS1
DRMCS1
I/O, L
DRAM Chip-Select 1 signal. CS2 on the
MPC821. Used as chip-select line for the first
bank of the DRAM SIMM. Pulled up. When the
DRAM is disabled via the BCSR, this signal
can be used off-board via the daughterboard’s
expansion connectors.
46
GND
GND
—
Table 5-9. PM1 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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