Anritsu MT9812B, Руководство по эксплуатации, Страница: 103 / 144

5-35
Remote Control
5
5.8 Queue Model
The right-hand side of the figure below shows a queue model having a status data
structure. A queue is a data structure in which data is arranged sequentially, pro-
viding information such as sequential status. A summary message indicates that
such information exists in the queue. Queue contents are read by an handshake
when the device is in TACS (talker active state).
7
ESB
MAV
3
2
1
0
MSS 6 RQS
Status Byte Register
⋅
⋅
⋅
⋅
Data
Data
Data
Data
Data
Data
Output Queue
⋅
⋅
⋅
⋅
Data
Data
Data
Data
Data
Data
Queue
MAV (message available)
summary bit
MAV (Message Available) summary bit
indicating the output queue is not empt
The queue that outputs an MAV summary bit to status byte register bit 4 is called
an "output queue." This queue is mandatory. The queue that can output an MAV
summary message to one of status byte register bits 0 to 3 and 7 is simply called a
"queue." It is optional. A summary message from the register model can also be
output to status byte register bits 0 to 3 and 7, so the summary message type
depends on the device type.
Refer to the Table 8-5 for a comparison of the output queue to general queues.
5.8 Queue Model