PEB 2091
PEF 2091
Operational Description
Table 19
Predefined EOC Messages
53
54
RCC
NCC
UTC
RTN
Request corrupt CRC
Notify of corrupt CRC
Unable to comply
Return to normal
Acknowledge
AA
FF
XX
If a command is declared as data (d/m = (0)), the IEC-Q will acknowledge with "UTC"
(i.e. 01AAH). Commands addressed different from (000B) or (111B) will be
acknowledged with the "Hold" message and the correct NT address (i.e. 0100H), see
"Predefined EOC Codes", page 231, for a complete list. All detected EOC-commands on
U are latched, i.e. they are valid as long as they are not explicitly disabled with the EOC
"RTN" command or a deactivation.
Each new EOC-command will be indicated with one single MON-0-message after the
triple-last-look criterion has been met (also if other addresses than (000) or (111) or
d/m = (0) are used). The verified message is not compared to the last accepted message
(triple-last-look). Instead a MON-0-message will be issued every time the new verified
message is different from the last. E.g. in case bit errors corrupted an EOC-command
the correct command will be reissued after error free transmission is resumed. The
execution of a correctly addressed command (000B or 111B) is performed only after the
"triple-last-look" criterion is met.
MON-0-commands given via IOM®-2 (DIN) or microprocessor interface will be ignored.
NT-Transparent Mode
Every 6 ms a MON-0-message is issued on IOM®-2. It contains the last received
EOC-message. No acknowledgment, no triple-last-look, no execution of the received
commands is performed in EOC Transparent mode. All these actions have to be initiated
by a control unit. With MON-8-messages all defined test functions (close/open loops,
send corrupted CRCs) can be executed in the NT, see "Test Loop-Backs", page 186.
Semiconductor Group
113
Data Sheet 01.99
INFINEON [ Infineon ]
