User`s manual

Software Manual • EKF Intelligent I/O Controller Family On CompactPCI
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EKF Elektronik GmbH * Philipp-Reis-Str. 4 * D-59065 HAMM (Germany)
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Read Data From Port: CMDIMR_RED_DATA
Description:
This command is used to tell the controller how many data the host has
red from a port’s read buffer. The port identifier specifies the port. The
reported amount of data was copied from the read buffer of the
corresponding port before this command.
Command Code:
8.
Command Data:
Size of the data block red from the read buffer before.
Parameters:
None.
Data:
None.
Command Word:
0x0Y08 0000
Flags Port ID Command Command Data
E
R
R
R
P
L
C
P
L
U
F
ID
3
ID
2
ID
1
ID
0
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
D
15
D
14
D
13
D
12
D
11
D
10
D
09
D
08
D
07
D
06
D
05
D
04
D
03
D
02
D
01
D0
0
0000YYYY00001000AAAAAAAAAAAAAAAA
31 28 27 24 23 16 15 8 7 0
Reply:
Flags Port ID Command Command Data
E
R
R
R
P
L
C
P
L
U
F
ID
3
ID
2
ID
1
ID
0
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
D
15
D
14
D
13
D
12
D
11
D
10
D
09
D
08
D
07
D
06
D
05
D
04
D
03
D
02
D
01
D0
0
X110YYYY00001000AAAAAAAAAAAAAAAA
31 28 27 24 23 16 15 8 7 0
The controller returns with the RPL and CPL flags set. The contents of
bits 15:00 in the reply word is unchanged.
On error the RPL, CPL and ERR flags are set and an error code is
passed in bits 15:00 of the reply word.
Notes:
The read buffer is organized as a ring buffer. Its handling is described in
the section “
EKF_MU_IO_BUFFER
”.
A RED_DATA command terminates a READ_NEED request set before.