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參數(shù)資料
| 型號： | MT90870 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Flexible 12 k Digital Switch (F12kDX) |
| 中文描述： | 靈活的12畝數(shù)字交換機（F12kDX） |
| 文件頁數(shù)： | 32/86頁 |
| 文件大小： | 2093K |
| 代理商： | MT90870 |
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MT90870
Data Sheet
32
Zarlink Semiconductor Inc.
Figure 13 - Local Port External High Impedance Control Bit Timing (ST-Bus Mode)
4.2 Backplane High Impedance Control
The input pin,
BORS
, selects whether the Backplane output streams,
BSTo0-31
are set to high impedance at the
output of the MT90870 itself, or are always driven (active HIGH or active LOW) and a high impedance state, if
required on a per-channel basis, is invoked through an external interface circuit controlled by the
BCSTo0-3
signals. Setting
BORS
to a LOW state will configure the output streams,
BSTo0-31,
to transmit bi-state channel
data with per-channel high-impedance determined by external circuits under the control of the
BCSTo0-3
outputs.
Setting
BORS
to a HIGH state will configure the output streams,
BSTo0-31,
of the MT90870 to invoke a high-
impedance output on a per-channel basis.
The
BORS
pin is an asynchronous input and is expected
to be hard-wired for a particular system application,
although it may be driven under logic control if preferred.
4.2.1 BORS Set LOW, Non-32 Mb/s Mode
The data (channel control bit) transmitted by
BCSTo0-3
replicates the Backplane Output Enable Bit (
BE
) of the
Backplane Connection Memory, with a LOW state indicating the channel to be set to High Impedance. See Section
12.4, Backplane Connection Memory Bit Definition for setting the Backplane Output Enable Bit (
BE
).
Chan 0 Bit 7
Chan 0 Bit 6
Chan 63 Bit 1
Chan 63 Bit 0
Chan 0
Bit 7
Chan 63
Bit 0
7
6
5
4
3
2
3
2
1
0
5
4
1
6
0
7
7
6
0
Chan 0
Bit 7
Chan 0
Bit 6
Chan 0
Bit 5
Chan 0
Bit 4
Chan 127
Bit 3
Chan 127
Bit 2
Chan 127
Bit 1
Chan 127
Bit 0
Chan 0
Bit 7
Chan 127
Bit 0
Channel 0 Bit 7
Channel 31 Bit 0
Chan 0
Bit 7
Chan 31
Bit 0
LCSTo0
LSTo0
(16 Mb/s)
LSTo1
(8 Mb/s)
LSTo6
(4 Mb/s)
LSTo7
(2 Mb/s)
C8o
FP8o
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
C
L
LCSTo1
One C16o period
Channel 0
Channel 255 bits 7-0
1
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相關(guān)代理商/技術(shù)參數(shù) |
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| MT90870AG | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 12K X 12K/8K X 4K 1.8V/3.3V 272BGA - Trays |
| MT90870AG2 | 制造商:Microsemi Corporation 功能描述:SWIT FABRIC 12K X 12K/8K X 4K 1.8V/3.3V 272BGA - Trays |
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| MT90871AV2 | 制造商:Microsemi Corporation 功能描述:PB FREE FLEXIBLE 8K DIGITAL SWITCH - Bulk 制造商:Microsemi Corporation 功能描述:IC, TDM SWITCH 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC DGTL SWITCH F8KDX 196PBGA 制造商:Microsemi Corporation 功能描述:IC DGTL SWITCH F8KDX 196PBGA |
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