Toshiba V Series Manual page 69

Shown below is the configuration of the S controller interface buffer memory as viewed
from the S controller. The addresses of the communication memory are word addresses.
(1) Semaphore Area
This area is used to issue requests from the S controller to operate the DN311 or to
read DN311 responses.
(2) RAS information Area
The DN311 displays module status and communication status with the network and
slave devices in this area.
(3) Input/Output Data Area
This area stores data exchanged between the DN311 and slave devices.
Output data from the S controller is written in this area, while input data is read from
this area. This area has output and input semaphore registers for synchronous
communication between the DN311 and slave devices.
6F8C0903
0000H
Input/output data area
02FFH
0300H
RAS information area
05D5H
05D6H
Semaphore area
07FFH
Figure 4-6 DN311 S controller interface buffer memory
4.2 S Controller Interface Buffer Memory Configuration
768 words
726 words
554 words
4
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