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MC145574 Datasheet

  • MC145574

  • ISDN S/T-Interface Transceiver

  • 658.40KB

  • Motorola   Motorola

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Freescale Semiconductor, Inc.
BR11(5), BR11(4) 鈥?Rx INFO State B1 and B0
These bits are read/write bits and are applicable to both NT and TE modes of operation. The MC145574
internally sets these bits to indicate the status of the received signal; i.e., it is INFO 0, 1, 2, 3, 4, or
X, where INFO X is none of the above. An example of INFO X would be when it is receiving the 96 kHz
test signal. Another example of INFO X would be where the transceiver is not receiving INFO 0, but
it has not yet determined whether it is INFO 1, 2, 3, or 4.
The codes corresponding to the different states are shown in Table 9鈥?.
Table 9鈥?. BR11(5), BR11(4) Rx INFO State Codes
BR11(5)
0
0
1
1
BR11(4)
0
1
0
1
Receive Information State
INFO 0
INFO LOW
INFO HIGH
INFO X
Freescale Semiconductor, Inc...
NOTE: When configured as an NT, receiving INFO LOW corresponds to receiving INFO 1, and receiv-
ing INFO HIGH corresponds to receiving INFO 3. Conversely, when the device is operating as a TE,
receiving INFO LOW corresponds to receiving INFO 2, and receiving INFO HIGH corresponds to re-
ceiving INFO 4. The device internally sets these bits, and this internal write overrides any external
write. These bits are reset to 0 by application of either a hardware or software reset.
BR11(3), BR11(2) 鈥?Tx INFO State B1 and B0
These bits are read/write bits and are applicable to both NT and TE modes of operation. The MC145574
internally sets these bits to indicate the status of the transmitted signal; i.e., is it INFO 0, 1, 2, 3, 4,
or X where INFO X is none of the above. An example of INFO X would be when it is transmitting
the 96 kHz test signal. The codes corresponding to the different states is shown in Table 9鈥?.
Table 9鈥?. BR11(3), BR11(2) Tx INFO State Codes
BR11(3)
0
0
1
1
BR11(2)
0
1
0
1
Transmit Information State
INFO 0
INFO LOW
INFO HIGH
INFO X
NOTE: When configured as an NT, transmitting INFO LOW corresponds to transmitting INFO 2, and
transmitting INFO HIGH corresponds to transmitting INFO 4. Conversely, when the device is operating
as a TE, transmitting INFO LOW corresponds to transmitting INFO 1, and transmitting INFO HIGH
corresponds to transmitting INFO 3. The device internally sets these bits, and this internal write over-
rides any external write. These bits are reset to 0 by application of either a hardware or software reset.
BR11(1) 鈥?External S/T Loopback
This bit is a read/write bit and is applicable to both NT and TE modes of operation. When this bit
is 0, the MC145574 functions normally. If the transmit pair is shorted to the receive pair while this
bit is 1, the device will perform an external or 鈥渁nalog鈥?loopback. In an analog loopback, the device
demodulates its own transmitted data. The transceiver should have its activation procedures disabled
(BR7(7) = 1) and be configured for the IDL2 master mode (BR7(3) = 1). This feature is useful for
test purposes. In external loopback, the B1 and B2 channels are looped back. In the NT mode, the
D channel is also looped back. The D channel is not looped back in the TE mode. Application of a
hardware or software reset will reset this bit to 0.
MOTOROLA
MC145574
For More Information On This Product,
Go to: www.freescale.com
9鈥?1

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