MT8986AC datasheet(21/38 Pages) MITEL

21 / 38 page

MT8986

2-83

throughput

delay

guaranteed.

For

such

applications,

the

MT8986

device

allows

cost

effective implementations of Non-Blocking matrices

ranging up to 1024 channels. Figures 12 and 13

show the block diagram of implementations with

Non-Blocking capacities of 512 and 1024-channel,

respectively.

Interfacing MT8986 with 8051

The Intel 8051 is a very cost effective solution for

many applications that do not require a large CPU

interaction and processing overhead. However, in

applications where 8051 is connected to peripherals

operating on a synchronous 8 kHz time-base like the

MT8986, some connectivity issues have to be

addressed. The MT8986 may hold the CPU read/

write cycle due to internal contention between the

MT8986 microport and the internal serial to parallel

and parallel to serial converters. Since the 8051

family of CPUs do not provide Data Ready type of

inputs,

some

external

logic

and

software

intervention have to be provided between the

MT8986 and the 8051 microcontrollers to allow read/

write operation. The external logic described in

Figure 14 is a block diagram of a logical connection

between MT8986 and 8051. Its main function is to

store the 8051 data during a write and the MT8986

data during a read.

For a write, MT8986 address is latched by the

internal address latch on the falling edge of the ALE

input. Whenever a read or write operation is done to

the MT8986 device, the address decoded signal

(MTA) is used to latch or "freeze" the state of RD,

WR, and the ALE signals, until the data acknow-

ledge output signal is provided by the MT8986

device, releasing the latches for a new read/write

cycle. Latch U5 is used to hold the 8051 data for a

write until the CPU is ready to accept it (when DTA

Figure 12 - 512-Channel Non-Blocking Switch Matrix with Serial Streams at 2.048 or 4.096 Mb/s

Figure 13 - 1024-Channel Non-Blocking Switch Matrix with Serial Streams at 2.048 Mb/s

OUT

16 Streams

@2.048 Mb/s

8 Streams

@2.048 Mb/s

8 Streams

@2.048 Mb/s

MT8986

512 x 256

OUT

8 Streams

@4.096 Mb/s

4 Streams

@4.096 Mb/s

4 Streams

@4.096 Mb/s

MT8986

512 x 256

16 Streams

@2.048 Mb/s

16 Streams

@2.048 Mb/s

MT8986

512 x 256

MT8986

512 x 256

MT8986

512 x 256

MT8986

512 x 256

MT8986

512 x 256

MT8986

512 x 256

MT8986

512 x 256

MT8986

512 x 256

8 Streams

@2.048 Mb/s

8 Streams

@2.048 Mb/s

8 Streams

@2.048 Mb/s

8 Streams

@2.048 Mb/s

OUT

MT8986AC Datasheet(PDF) 21 Page - Mitel Networks Corporation

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