Functional Description
8-6 ADSP-214xx SHARC Processor Hardware Reference
to form a MLB logical channel, which is defined by a unique channel
address.
As shown in Figure 8-1, the MLB controller initiates communication by
sending out a channel address on the
MLBSIG line for each physical chan-
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
MLBSIG line, the transmitting device outputs a command byte command
on the MLBSIG line and outputs the respective data on the MLBDAT line, con-
currently. The MLB command byte contains the type of data currently
being transmitted (for example synchronous, asynchronous or control).
The MLB device receiving the channel data outputs a status byte, RxSta-
tus, on the MLBSIG line immediately after the transmitting device outputs
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
Figure 8-1. MLB Data Structure
MLBSIG
MLBDAT
CONTROLLER GRANTS THE
TRANSMITTING DEVICE ACCESS
TO THE LOGICAL CHANNEL ASSOCIATED
WITH THE CHANNELADDRESS
TRANSMITTING DEVICE SENDS ITS
COMMAND AND ASSOCIATED DATA
ON THE LOGICAL CHANNEL ASSOCIATED
WITH THE CHANNELADDRESS
RECEIVING DEVICE ACCEPTS
OR REJECTS THE DATA USING
THE RXSTATUS FIELD
TXCMD
RX
STATUS
DATA
1 QUADLET = 1 PHYSICAL CHANNEL
4-BYTE DELAY
1 QUADLET = 1 PHYSICAL CHANNEL
CHANNEL
ADDRESS
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