MT8980D

Data Sheet

7

Zarlink Semiconductor Inc.

Figure 5 - Connection Memory High Bits

Figure 6 - Connection Memory Low Bits

BIT

NAME

DESCRIPTION

2Message

Channel

When 1, the contents of the corresponding location in Connection Memory Low are output on the

location’s channel and stream. When 0, the contents of the corresponding location in Connection

Memory Low act as an address for the Data Memory and so determine the source of the

connection to the location’s channel and stream.

1CSTo Bit

This bit is output on the CSTo pin one channel early. The CSTo bit for stream 0 is output first.

0

Output

Enable

If the ODE pin is high and bit 6 of the Control Register is 0, then this bit enables the output driver

for the location’s channel and stream. This allows individual channels on individual streams to be

made high-impedance, allowing switching matrices to be constructed. A 1 enables the driver and a

0 disables it.

BIT

NAME

DESCRIPTION

7-5*

Stream

Address

Bits*

The number expressed in binary notation on these 3 bits is the number of the ST-BUS stream for

the source of the connection. Bit 7 is the most significant bit. e.g., if bit 7 is 1, bit 6 is 0 and bit 5 is

0, then the source of the connection is a channel on STi4.

4-0*

Channel

Address

Bits*

The number expressed in binary notation on these 5 bits is the number of the channel which is the

source of the connection (The ST-BUS stream where the channel lies is defined by bits 7, 6 and

5.). Bit 4 is the most significant bit. e.g., if bit 4 is 1, bit 3 is 0, bit 2 is 0, bit 1 is 1 and bit 0 is 1,

then the source of the connection is channel 19.

*If bit 2 of the corresponding Connection High location is 1 or if bit 6 of the Control Register is 1, then these entire 8 bits are

output on the channel and stream associated with this location. Otherwise, the bits are used as indicated to define the source of

the connection which is output on the channel and stream associated with this location.

76

5

4

3

2

1

0

No Corresponding Memory

- These bits give 0s if read.

Per Channel

Control Bits

7

6

543

2

1

0

Stream

Address

Bits

Channel

Address

Bits