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MC145574 Datasheet

  • MC145574

  • ISDN S/T-Interface Transceiver

  • 658.40KB

  • Motorola   Motorola

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Freescale Semiconductor, Inc.
are reset to 0 by application of either a software or hardware reset. Note that BR10(7) is the MSB
of SC4 and BR10(4) is the LSB. Refer to Section 10 multiframing for a detailed description of the
multiframing procedure.
TE: SC4 from Loop
鈥?BR10(7:4) are used in the multiframing mode of operation. When the device
is configured as a TE and multiframing has been enabled, these bits correspond to the received sub-
channel 4 nibble from the NT. These bits are updated once every multiframe. BR10(7:4) are read
only bits and are reset to 0 by either a software or hardware reset. Note that BR10(7) is the MSB
of SC4 and BR10(4) is the LSB. Refer to Section 10 for a detailed description of multiframe procedures.
BR10(3:0)
NT: SC5 to Loop
鈥?BR10(3:0) are used for multiframing. In the NT mode of operation, these four
bits correspond to subchannel 5 for transmission to the TE(s). When multiframing is enabled, the NT
will transmit the bits in BR10(3:0) as subchannel 5, in accordance with CCITT I.430, ETSI ETS 300012,
and ANSI T1.605. BR10(3:0) is internally polled at the start of every multiframe (this occurs every
5 ms and the device can be programmed via NR4(2) to give an interrupt at the start of every multiframe),
and the contents are interpreted as subchannel 5. If multiframing is enabled and the contents of
BR10(3:0) have not been updated, the subchannel is re鈥搕ransmitted as is. BR10(3:0) can be updated
any time between the 5 ms interrupts. In the NT mode of operation, BR10(3:0) are write only bits.
These bits are reset to 0 by application of either a software or hardware reset. Note that BR10(3)
is the MSB of SC5 and BR10(0) is the LSB. Refer to Section 10 for a detailed description of the multi-
frame procedure.
TE: SC5 from Loop
鈥?BR10(3:0) are used in the multiframing mode of operation. When the device
is configured as a TE and multiframing has been enabled, these bits correspond to the received sub-
channel 5 nibble from the NT. These bits are updated once very multiframe. BR10(3:0) are read only
bits and are reset to 0 by either a software or hardware reset. Note that BR10(3) is the MSB of SC5
and BR10(0) is the LSB. Refer to Section 10 for a detailed description of the multiframe procedure.
Freescale Semiconductor, Inc...
9.13
BR11
(7)
BR11
NT: Do Not
React To
INFO 1
TE: Not
Applicable
(6)
NT: Do Not
React To
INFO 3
TE: Not
Applicable
(5)
Rx INFO
State B1
(4)
Rx INFO
State B0
(3)
Tx INFO
State B1
(2)
Tx INFO
State B0
(1)
External
S/T
Loopback
(0)
Transmit
96 kHz
Test Signal
9.13.1 BR11(7) 鈥?NT: Do Not React to INFO 1
TE: Not Applicable
This bit is only applicable to the NT mode of operation. When this bit is 0, the part functions normally.
When this bit is 1, the NT will not react to INFO 1 from the TE. (Note, however, that the NT will give
an interrupt indicating a change in received information state.) Only when the NT resets this bit to
0 will it react to INFO 1. This feature is used in the NT in applications where it is necessary to delay
activation of the S/T loop until the U link has reached its active state. This bit is a read/write bit and
is reset to 0 by application of either a hardware or software reset.
BR11(6) 鈥?NT: Do Not React to INFO 3
TE: Not Applicable
This bit is only applicable to the NT mode of operation. When this bit is 0, the part functions normally.
When this bit is 1, the NT will not react to INFO 3 from the TE (this INFO 3 from the TE being the
response of the TE to INFO 2 from the NT). Only when the NT resets this bit to 0 will it react to INFO
3. In the meantime, the NT will continue to transmit INFO 2. This feature is used in the NT in applications
where it is necessary to delay activation of the S/T loop until the U link has reached its active state.
This bit is a read/write bit and is reset to 0 by application of either a hardware or software reset.
9鈥?0
MC145574
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA

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