MOTOROLA
MSC8101ADS RevB User’s Manual
B-89
D20
FETHMDIO (PC12)
I/O, T.S.
Fast-Ethernet Port Management Data I/O. This signal serves as
bidirectional serial data line, qualified by FETHMDC, to allow read
/ write the LXT970’s internal registers.
When the Ethernet port is disabled, this line may be used for any
available function of PC12.
D21
HREQTRQ
O, T.S.
When the HDI16 is enabled and programmed to interface to a
single host request, this pin is the host request output (HREQ).
This pin can be used for host DMA requests in host DMA mode.
When the HDI16 is programmed to interface to a double host
request, this pin is the transmit host request output (HTRQ).
Tristated when HDI16 is disabled. Present as well as at P4
connector.
D22
N.C.
-
Not connected.
D23
D24
HRRQACK
I/O, T.S.
When the HDI16 is enabled and programmed to interface to a
single host request, this pin is the host acknowledge Schmitt
trigger input in host DMA mode (HACK). The polarity of the host
DMA acknowledge is programmable. When the HDI16 is
programmed to interface to a double host request, this pin is the
receive host request output (HRRQ). The direction of this line
may be programmed by BCSR0/1. See
TABLE 5-9. "BCSR0
Description" on page 55
.
D25
PC7
I/O, T.S.
MSC8101’s Port C (7:6) Parallel I/O lines. May be used to any of
their available functions.
D26
PC6
D27
SMCTX1(PC5)
I/O, T.S.
When RS232 port #2 is enabled, this signal is the transmit data
line for SMC1 port. When this port is disabled, this signal may be
used to any available alternate function for PC5.
D28
SMCRX1(PC4)
I/O, T.S.
When RS232 port #2 is enabled, this signal is the receive data
line for SMC1 port. When this port is disabled, this signal may be
used to any available alternate function for PC4.
D29
HA0
I
Host Interface Address Line 0. Tristated when Host I/F is
disabled. Present as well as at P4 connector.
D30
HA1
I
Host Interface Address Line 1. Tristated when Host I/F is
disabled. Present as well as at P4 connector.
D31
HA2
I
Host Interface Address Line 2. Tristated when Host I/F is
disabled. Present as well as at P4 connector.
D32
HA3
I
Host Interface Address Line 3. Tristated when Host I/F is
disabled. Present as well as at P4 connector.
a. The functions in parenthesis, are MSC8101’s parallel I/Os.
b. Normally connected to ATMTFCLK on the ADS.
c. MS bit.
d. For that matter, both 100-Base-T and 10-Base-T.
TABLE B1-3. P2 - CPM Expansion - Interconnect Signals
Pin No.
Signal Name
Attribute
Description
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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