MT90869AG Zarlink, MT90869AG Datasheet - Page 24

• Manufacturer Part Number: MT90869AG
• Description: Switch Fabric 16K x 16K/8K x 8K 1.8V/3.3V 272-Pin BGA Tray
• Manufacturer: Zarlink

Specifications of MT90869AG

• Package: 272BGA
• Number Of Ports: 64
• Fabric Size: 16K x 16K|8K x 8K
• Switch Core: Non-Blocking|Blocking
• Port Speed: 8.192|4.096|2.048 Mbps
• Operating Supply Voltage: 1.8|3.3 V

By programming the Backplane or Local input channel delay registers, BCDR0-31 and LCDR0-31, users can
assign the Ch0 position to be located at any one of the channel boundaries in a frame. For delays within channel
boundaries, the input bit delay programming can be used.
The use of Input Channel Delay in combination with Input Bit Delay enables the Ch0 position to be placed
anywhere within a frame to a resolution of 1/4 of the bit period.
3.2
In addition to the Input Channel Delay programming, the Input Bit Delay programming feature provides users with
greater flexibility when designing switch matrices for high speed operation. The input bit delay may be programmed
on a per-stream basis to accommodate delays created on PCM highways. For all streams the delay is up to 7 3/4
bits with a resolution of 1/4 bit, for the selected data-rate.
See Figure 10 and Figure 11 for Input Bit Delay Timing at 16 Mb/s and 8 Mb/s data rates, respectively.
The local input delay is defined by the Local Input Delay registers, LIDR0 to LIDR31, corresponding to the local
data streams, LSTi0 to LSTi31, and the backplane input delay is defined by the Backplane Input Delay registers,
BIDR0 to BIDR31, which correspond to the backplane data streams, BSTi0 to BSTi31.
BSTi0-31/LSTi0-31
BSTi0-31/LSTi0-31
Channel Delay = 2
Channel Delay = 0
Channel Delay = 1
BSTi0-31LSTi0-31
Input Bit Delay Programming (Backplane and Local Input Streams)
(Default)
FP8i
C8i
Figure 9 - Backplane and Local Input Channel Delay Timing Diagram
3
3
3
2
2
2
1 0
1 0
1 0
7
7
7
6
Channel Delay,1
6
6
Ch 0
5
Ch127
5
Ch126
5
4
4
4
3
3
3
2
2
2
Channel Delay, 2
1 0
1 0
1 0
Zarlink Semiconductor Inc.
7
7
7
6
6
6
MT90869
5
5
5
Ch 1
Ch 0
Ch127
4
4
4
3
3
3
24
2
2
2
1 0
1 0
1 0
7
6
5
Ch0
4
3
6
6
2
5
5
Ch126
Ch125
1 0
4
4
3
3
2
2
1 0
1 0
7
7
7
6
6
6
Ch127
5
Ch126
5
Ch125
5
4
4
4
3
3
3
2
2
2
1 0
1 0
1 0
Data Sheet
7 6
7 6
7 6