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參數(shù)資料
| 型號(hào)： | T7234 |
| 英文描述： | Compliance with the New ETSI PSD Requirement |
| 中文描述： | 符合新的ETSI PSD的要求 |
| 文件頁數(shù)： | 47/116頁 |
| 文件大?。?/td> | 1056K |
| 代理商： | T7234 |
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Data Sheet
January 1998
T7256 Single-Chip NT1 (SCNT1) Transceiver
Lucent Technologies Inc.
43
Data Flow Matrix Description
B1-, B2-, D-Channel Routing
The T7256 supports extremely flexible B1-, B2-, and D-
channel routing among major circuit blocks in order to
accommodate various applications. Channel routing is
controlled via the data flow control registers, DFR0 and
DFR1. Figure 16 shows a block diagram of the device
and the channel paths to and from the U transceiver,
S/T transceiver, and TDM bus interface. Channel flow is
determined by specifying the source of channel data at
the three points shown in the figure: (1) U transceiver
transmit input, (2) S/T transceiver transmit input, and (3)
TDM bus transmit input. Channel flow at the TDM bus
receive input (4) is determined, by default, from the set-
tings at the other three points. A switch matrix within the
data flow matrix block routes channels to and from the
specified points.
As an example, below are the register settings required
to configure the device as an NT1, with the B1 and B2
channels in both the U- to S/T- and S/T- to U-interface
directions made available on the TDM bus for monitor-
ing:
I
TDMEN = 0 (enables TDM bus).
I
UXB1 = 11, UXB2 = 11, UXD = 1 (routes S/T-inter-
face receive channels to U-interface transmitter).
I
SXB1 = 11, SXB2 = 11, SXD = 1 (routes U-interface
receive channels to S/T-interface transmitter).
I
TDMB1S = TDMB2S = 0 (brings out B1 and B2
channels in S/T- to U-interface direction to TDM bus).
I
TDMDS = 1 (D channel in S/T- to U-interface direc-
tion not brought out on TDM bus).
I
TDMB1U = TDMB2U = 0 (brings out B1 and B2
channels in U- to S/T-interface direction to TDM bus).
I
TDMDU = 1 (D channel in U- to S/T-interface direc-
tion not brought out on TDM bus).
Refer to the Board-Level Testing section for another
example of using the data flow matrix to route data.
5-2304 (C)
Figure 16. B1-, B2-, D-Channel Routing
TDM BUS INTFC.
μP INTERFACE
μP INTERFACE
DATA FLOW
CONTROLLER
SWITCH MATRIX
TDM BUS INTERFACE
TRANSMIT
RECEIVE
TRANSMIT
U TRANSCEIVER
S/T TRANSCEIVER
2
RECEIVE
3
1
4
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