Memory Map - Toshiba AS311 User Manual

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.
4.2.1

Memory 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
0
4
128
576
1024
1472
1920
26
ASCII Interface Module (AS311)
Word data
Status and command
Parameter
Channel 1
reading (receiving)
data area
Channel 1
writing (transmitting)
data area
Channel 2
reading (receiving)
data area
Channel 2
writing (transmitting)
data area
Access inhibited
4 words - same data as I/O registers
124 words - transmission parameters, etc.
448 words
448 words
448 words
448 words
128 words