Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 402

Functional Description
to form a MLB logical channel, which is defined by a unique channel
address.
As shown in Figure
sending out a channel address on the
nel. The channel address indicates which MLB device is transmitting and
which MLB devices are receiving in the following physical channel. There-
fore, four bytes after the controller outputs the channel address on the
line, the transmitting device outputs a command byte command
MLBSIG
on the line and outputs the respective data on the
MLBSIG
currently. The MLB command byte contains the type of data currently
being transmitted (for example synchronous, asynchronous or control).
CONTROLLER GRANTS THE
TRANSMITTING DEVICE ACCESS
TO THE LOGICAL CHANNEL ASSOCIATED
WITH THE CHANNELADDRESS
CHANNEL
MLBSIG
ADDRESS
MLBDAT
Figure 8-1. MLB Data Structure
The MLB device receiving the channel data outputs a status byte, RxSta-
tus, on the
MLBSIG
the command byte. The status response can indicate that the receiving
device is busy and cannot receive the data at present, or the device is ready
to receive the data. Since synchronous stream data is sent in a broadcast
8-6
www.BDTIC.com/ADI
8-1, the MLB controller initiates communication by
TRANSMITTING DEVICE SENDS ITS
COMMAND AND ASSOCIATED DATA
ON THE LOGICAL CHANNEL ASSOCIATED
WITH THE CHANNELADDRESS
4-BYTE DELAY
1 QUADLET = 1 PHYSICAL CHANNEL
line immediately after the transmitting device outputs
ADSP-214xx SHARC Processor Hardware Reference
line for each physical chan-
MLBSIG
RECEIVING DEVICE ACCEPTS
OR REJECTS THE DATA USING
THE RXSTATUS FIELD
RX
TXCMD
STATUS
DATA
1 QUADLET = 1 PHYSICAL CHANNEL
line, con-
MLBDAT