MT90820AL1 Zarlink Semiconductor, Inc., MT90820AL1 Datasheet - Page 22

• Manufacturer Part Number: MT90820AL1
• Description: Large Digital Switch
• Manufacturer: Zarlink Semiconductor, Inc.

Applications
Switch Matrix Architectures
The MT90820 is an ideal device for medium to large size switch matrices. Applications where voice and grouped
data channels are transported within the same frame, the voice samples have to be time interchanged with a
minimum delay while maintaining the integrity of grouped data. To ensure the integrity of grouped data during
switching and to provide a minimum delay for voice connections, the MT90820 provides the per-channel selection
between variable and constant throughput delay. This can be selected by the V/C bit of the Connection Memory.
Figure 5 illustrates how four MT90820 devices can be used to form non-blocking switches up to 4096 channels with
data rate of 8.192 Mb/s.
Device Pin
FE/HCLK
STo15
STo14
STo13
STo12
STo10
STo11
STi15
STi14
STi13
STi12
STi11
STi10
Table 15 - Boundary Scan Register Bits
STo9
STo8
CLK
STi9
STi8
STi7
STi6
STi5
STi4
STi3
STi2
STi1
STi0
F0i
Zarlink Semiconductor Inc.
Tristate
Control
MT90820
Boundary Scan Bit 0 to Bit 117
102
104
106
108
110
112
114
116
22
Scan Cell
Output
103
105
107
109
111
113
115
117
Scan Cell
Input
100
101
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
Data Sheet