參數(shù)資料
型號(hào)： MT90866AG2
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 路由/交換
英文描述： Flexible 4 K x 2.4 K Channel Digital Switch with H.110 Interface and 2.4 K x 2.4 K Local Switch
中文描述： TELECOM, DIGITAL TIME SWITCH, PBGA344
封裝： 27 X 27 MM, LEAD FREE, PLASTIC, MS-034, BGA-344
文件頁數(shù)： 18/86頁
文件大?。?/td> 701K
代理商： MT90866AG2
MT90866
Data Sheet
18
Zarlink Semiconductor Inc.
Figure 4 - ST-Bus Timing for 16 Mb/s Backplane Data Streams
4.0 Switching Configuration
The device has two operation modes at different data rates for the backplane interface and five operation modes for
the local interface. These modes can be programmed via the Device Mode Selection (DMS) register. Mode
selections between the backplane and local interfaces are independent.
4.1 Backplane Interface
The backplane interface can be programmed to accept data streams of 8 Mb/s or 16 Mb/s. When H.110 mode is
enabled, STio0 to STio31 have a data rate of 8.192 Mb/s. When ST-BUS mode is enabled, STio0 to STio15 have a
data rate of 16.384 Mb/s. Table 1 on page 18 describes the data rates and mode selections for the backplane
interface.
4.2 Local Interface
Five operation modes, 2 Mb/s, 4 Mb/s, 8 Mb/s, 2-bit sub-rate and 4-bit sub-rate switching, can be selected for the
local ST-BUS interface. The local interface is divided into five groups. Group 0 contains STi/STo0-3, Group 1
contains STi/STo4-7, Group 2 contains STi/STo8-11, Group 3 contains STi/STo12-15 and Group 4 contains
STi/STo16-27. Each group can be selected individually through the Device Mode Selection (DMS) register. Streams
belonging to the same group have the same operation mode. For Groups 0 to 3, any one of the five operation
modes can be selected. Input data streams STi0-15 and output data streams, STo0 -15 can be selected according
to the group to which they belong. STi16-27 and output data streams STo16-27 belong to Group 4 and can operate
in 2 Mb/s mode. In Group 4, only input data streams Sti16-18 and output data streams Sto16-18 can operate in
4 Mb/s and 8 Mb/s mode. When operating Group 4 at 4 Mb/s or 8 Mb/s the unused output streams, STo19-27 are
driven low. No sub-rate modes are available for Group 4 data streams. See Table 2 on page 19 to Table 6 on
page 20 for a description of the data rates and mode selection for the local ST-BUS interface.
BMS bit of the DMS Register
Modes
Backplane Interface
0
8.192 Mb/s
STio0 - 31
1
16.384 Mb/s
STio0 - 15
Table 1 - Mode Selection for Backplane Streams
7
2
3
4
5
6
1 0
STio 0 - 15
(16 Mb/s mode)
Channel 255
Channel 0
7
2
3
4
5
6
1 0
Channel 1
7
2
3
4
5
6
1 0
2
3
4
5
6
1 0
Channel 254
7 6 5
2
3
1 0
Ch 0
Ch 255
FRAME_A_io,
FRAME_B_io
(CT Frame)
C8_A_io,
C8_B_io
8.192 MHz
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