參數(shù)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(wù)數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù): 53/164頁
文件大?。?/td> 1072K
代理商: MC145574
MC145574
6–7
MOTOROLA
In the GCI NT master mode, it is possible to select both NT1 Star and NT Terminal modes via the
Monitor channel. The associated pins used in the default IDL2 mode are enabled and operate in the
same manner.
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In the GCI TE master mode, only three modes of operation are available.
Table 6–4. M2, M1, and M0 Pins in GCI TE Master Mode
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M2
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0
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0
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0
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0
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1
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1
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1
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1
M1
M0
GCI TE Master Mode
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
DCL = 2.048 MHz
Reserved
Reserved
Reserved
DCL = 1.536 MHz, Terminal Mode
Reserved
Reserved
DCL = 512 kHz
When M(2:0) = 4, terminal mode is selected. In this mode, the MC145574 always operates in channel 0,
and D channel availability is indicated in two ways:
1. If pin SG = 1, then the D channel is currently idle and available for access. If pin SG = 0, then
the D channel on the passive bus is being used by another TE device.
If the SG pin toggles during the time when the device is using the D channel, then a collision
has occurred and the device stops its D channel access. SG indicates stop/go for D channel
access.
2. In parallel with the SG pin, this signal is also output from the device in bit 4 of the C/I channel
of CH2. This is compatible with the SCIT bus specification and is also compatible with the
MC68302. This is enabled via the Monitor channel in register OR7(6).
When M(2:0) = 7, only one GCI channel is available, and D channel availability is indicated by
the SG pin only.
The D channel access circuitry can be disabled by writing to a control register via the Monitor
channel, BR7(6). When this is done, it is assumed that the device is not operating in a passive
bus application and has sole use of the D channel. When disabled, the SG pin and bit always
equal one, and the GCI D channel data flows transparently to the S/T loop interface.
In the activated state, GCI transparently transmits the information in the B and D channels in the NT
and TE slave modes. In TE master mode, D channel flow control is operational and access to the
D channel must be requested. Refer to the section on GCI D channel operation for further details.
The GCI M (or Monitor) channel is intended to be used for the transfer of operation and maintenance
information between management and layer 1 entities. For the MC145574, this means that the Monitor
channel is used to access the internal registers defined for the SCP mode of operation. The A/E channel
is used to control the transfer of the information on the Monitor channel by providing a handshake
facility.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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