參數資料
型號： MC145574
廠商： Motorola, Inc.
英文描述： ISDN S/T-Interface Transceiver
中文描述： 綜合業(yè)務數字網S / T的接口收發(fā)器
文件頁數： 56/164頁
文件大?。?/td> 1072K
代理商： MC145574
MC145574
6–10
MOTOROLA
A GCI device transmits Monitor channel commands to a receiving MC145574 to access its internal
register set. The receiving MC145574 then transmits a Monitor channel response message onto the
Monitor channel for commands that request data to be read from an internal register. Commands
that write data to an internal MC145574 register are accepted and acted upon, but the MC145574
does not issue a response message. The Monitor channel commands are given in Table 6–5.
The MC145574 acknowledges all messages it receives over the Monitor channel. If an invalid message
is received, the MC145574 acknowledges it but does not take any action.
Table 6–5. Monitor Channel Commands
MSB
Byte 1
LSB
MSB
Byte 2
LSB
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Comment
0
0
0
0
ba3
ba2
ba1
ba0
d7
d6
d5
d4
d3
d2
d1
d0
Byte Write
0
0
0
1
ba3
ba2
ba1
ba0
X
X
X
X
X
X
X
X
Byte Read
0
0
1
0
0
na2
na1
na0
d3
d2
d1
d0
X
X
X
X
Nibble Write
0
0
1
1
0
na2
na1
na0
X
X
X
X
X
X
X
X
Nibble Read
1
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
ID Command
The Monitor channel response messages are transmitted onto the GCI Monitor channel by the
MC145574 in response to a register read command. The Monitor channel response messages are
given in Table 6–6.
Table 6–6. Monitor Channel Response Messages
MSB
Byte 1
LSB
MSB
Byte 2
LSB
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Comment
0
0
0
1
ba3
ba2
ba1
ba0
d7
d6
d5
d4
d3
d2
d1
d0
Byte Read
0
0
1
1
0
na2
na1
na0
d3
d2
d1
d0
x
x
x
x
Nibble Read
0
1
0
0
0
0
0
0
x
x
x
x
x
x
x
x
ID Response
This message is automatically transmitted onto the GCI Monitor channel by the MC145574 when a
status change has occurred within the device. This message is analogous to the interrupt in SCP
mode. The Monitor channel status indication message is given in Table 6–7.
The status indication message is in effect a read of the interrupt status register NR3. By default, this
indication message is disabled. The indication message must be first enabled by writing to the Monitor
channel register NR4.
Table 6–7. Monitor Channel Status Indication Messages
MSB
Byte 1
LSB
MSB
Byte 2
LSB
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Comment
0
0
1
1
0
0
1
1
d3
d2
d1
d0
x
x
x
x
NR3 Read
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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