Chapter 8 Register Structure
8.3
How to access registers
You use the dedicated commands (
FUN201
for EH-CPUs,
SCRW
for EHV-CPUs) to access EH-ETH2
register. The notation of these commands specification and the usage for this module are described here.
FUN201 command
Format
FUN 201 ( s )
Parameter
Starting I/O No. of the s parameter area
Function
These are the commands to access registers.
- This is the command to read or write Status and Control Register between CPU module and this module.
- The control type supported by this command is only “With hand shaking” for writing. Don’t specify and execute “Without hand
shaking” for writing.
- When Status Register is read, select the control type “With hand shaking” or “Without hand shaking”. ("Without hand shaking" is
recommended.)
The description of s parameter area
s + 0 (1) Return code
s + 1 (2) System area
s + 2
(Not be allowed to use by user)
s + 3 (3) Control type
s + 4 (4) The start of the area
s + 5 (5) Control bit I/O No. of starting sending or
receiving
s + 6 (6) Starting I/O No. of Destination (or Source)
s + 7 (7) Size
The description of control bit table for writing or reading.
+ 0 (8) Starting execution flag
(1) Return code
The execution result of FUN201 command is set.
Completed without error -> = H0000
Completed with error -> != H0000
(2) System area
This area is used by system execution when FUN201
command is executed. Don’t use this area by user.
(3) Control type
H0001: The request to get value from Status Register (“With
hand shaking” is supported.)
H0002: The request to get value from Status Register
(“Without hand shaking” is supported.)
H0003: The request to put value to Control Register.
HA55A: Request to software reset.
Please don't set up any values other than the above.
(4) The start of the area
+ 1 (9) The completion flag without error
b15 b11 b7
b0
+ 2 (10) The completion flag with error
Unit No.
Slot No.
The position of word
The description of the frame
The area should be set by user
The area inhibited to set by user
(8) Starting execution flag
When to start sending or receiving with FUN201 command,
please set “1” by user program.
This bit will be reset by system execution when the sending
or receiving is completed.
(9) The completion flag without error
This bit will be set to “1” when the sending or receiving by
FUN201 command is completed without error. This will be
reset by system when FUN201 start to execution.
(10) The completion flag with error
This bit will be set to “1” when the sending or receiving by
FUN201 command is completed with error. This will be
reset by system when FUN201 start to execution.
Unit No.: Always “0” is required
Slot No. : Following value is required.
[For EH-CPU516/548] One of 0 to 7.
[For other EH-CPUs] One of 0 to 2.
The position of word:
[When control type is selected H0001 or H0003]
Always “
H00
” is required
[When control type is selected H0002]
Always “
H2F
” is required
(5) Control bit I/O No. of starting sending or receiving
The actual address value of R, L and M which has the
starting I/O No. of the sending or receiving control bit area
should be set using ADRIO command.
(6) Starting I/O No. of Destination (or Source)
The actual address value of WR, WL and WM which has the
starting I/O No. of the source or destination area should be
set using ADRIO command.
(7) Size
The size of using area for sending or receiving should be set.
For this module, maximum size is 55 words.
8-13
