4. Register Configuration
4.2 AS311 buffer memory
As explained in the previous section, the I/O registers that are assigned to AS311 are used to control the reading and writing timings (handshake) between T3 and AS311.
On the other hand, for exchanging the transmission data between T3 and AS311, the AS311’s buffer memory is used.
This section explains the buffer memory contents and how to access the buffer memory.
4.2.1Memory map
The AS311 has the buffer memory that is used to exchange data with T3. The overall map of the buffer memory is as follows.
Address | Word data | |
0 |
| Status and command |
4 |
|
|
| Parameter | |
128Channel 1
reading (receiving)
data area
576Channel 1
writing (transmitting)
data area
1024 | Channel 2 |
| reading (receiving) |
| data area |
1472 |
|
Channel 2 | |
| writing (transmitting) |
| data area |
1920 |
|
Access inhibited |
4 words - same data as I/O registers
124 words - transmission parameters, etc.
448words
448words
448words
448words
128words
26 ASCII Interface Module (AS311)
