MT9080B データシートの表示（PDF） - Mitel Networks
部品番号
コンポーネント説明
メーカー
MT9080B Datasheet PDF : 25 Pages
| |||
CMOS MT9080B
This mode provides minimum delay through the SMX
for any switching configuration.
Data Memory Mode-2
Data Memory Mode-2 is designed for use in
constructing a 1024 by 1024 channel double buffered
switch. This mode is similar in most respects to Data
Memory Mode-1. The double buffering is achieved by
dividing the internal 2048 memory into two equal
blocks. In a single frame, data is written into the first
block and read from the second. In the next frame,
the data will be written into the second and read from
the first (see Figure 6). Frame sequence integrity of
the data will be maintained for all switching
configurations if the output frame is delayed by one
channel with respect to the input frame. In this case,
data clocked into the device during any of the
channels in the current frame will be clocked out in
the next frame. However, if the input and output
frames are aligned, then data switched from any
input channel to output channels 0 or 1 will be
clocked out one frame after the next - consequently
frame sequence integrity is not maintained for
channels 0 or 1. Frame sequence integrity will be
maintained for data switched to any of the other
output channels. (See SMX/PAC Application Note,
MSAN-135, for more information.)
acceptable clock frequency or frame rate. In this
mode, the size of the switching matrix depends on
the clock and frame rates provided as per the
following relationship:
S = FCK
2 X F FP
where S is the number of channels in the switching
matrix FFP is the frame pulse frequency in Hz, and
FCK is the clock frequency in Hz. The following table
shows how the size of a switching matrix can be
varied by selecting a suitable combination of clock
and frame rates.
CK (MHz) FP (kHz)
16.384
4
16.384
8
16.384
16
12.288
4
12.288
8
8.192
4
8.192
8
Number of channels in
the switching matrix
2,048
1,024
512
1,536
768
1,024
512
It is not possible to switch between Data Memory
Mode-3 and other modes on per-timeslot basis.
It is possible to switch between Data Memory
Mode-1 and Mode-2 on a per timeslot basis.
Data Memory Mode-3
This mode is similar to Data Memory Mode-1.
However, there is no restriction on the minimum
Connect Memory Mode -1
In Connect Memory Mode-1, the input data bus is
bidirectional. Internal memory locations can be
randomly accessed via the microprocessor bus. The
pinout of the device in this mode is illustrated in
Figure 7.
CK
FRAME 0
Data
Input
1023
0
FRAME 1
1
1023
FRAME 2
0
1
Written to
Block 1
Written to Block 0
Written to Block 1
FRAME 0
Data
Output
1023
0
FRAME 1
1
1023
FRAME 2
0
1
Read from
Block 0
Read from Block 1
Read from Block 0
Note: No input and output channel alignment is implied in the example shown above. It is assumed that the frame pulse for the
connection memory used to generate adresses for the read operation has a specific phase relationship with respect to the Data
Memory frame pulse.
Figure 6 - Data Memory Mode-2 Functional Timing
2-107
Share Link: 