Table of Contents - TG Drives

EXTENDED REGISTER GROUPS
EEPROM
Group Group
No.
Description
EEprom 16 Non-volatile parameter storage.
GENERAL
EEprom
The EEprom group has 128 registers. Each EEprom register is 32 bit wide. The
registers EEprom.29, 63, 93, 127 are reserved for storage of partial checksums of
the data
NOTE: At startup, the DMC 2 unit will always print the sign on text (and eventual
error messages) at 9600 baud. The EEprom variables are then used to setup other
addresses, etc. This is allows a standard terminal to be used to verify that the
system is working properly. It also allows firmware errors to be reported prior to a
system crash.
The initial printout (done without enabling the interrupt system) may look something
like this:
1: DMC Ver 5.00
2: ?FirmWare checksum error: SUM = xxxx
3:
If line 2: is printed, the System Firmware is damaged or the CPU board may be
malfunctioning.
If the cursor stops at instead of going to , the system locked (crashed)
when the interrupt system was enabled.
If only line 1 is printed and the cursor stops at position , the firmware checksum
was ok but the system crashed when the interrupt system was initiated. If the
cursor stops at , i.e. at the beginning of a new line, the problem may be one of
the following:
A baud rate different from 9600 is setup by code in the EEprom.
A baud rate different from 9600 is setup by auto starting PL-code.
A comm-mode indicating computer mode, deselected unit, or xoff status bit set is
setup in the EEprom.
FUNCTION
In the DMC 2 there is a 16 kbit serial EEprom which may be used for nonvolatile
storage of application parameters. Some system parameters are taken from the
EEprom at power up. Only 4 kbit are used for the 128 EEProm registers. The rest
is used by the ParArea resource.
At power up (reset), or when forced by the EEload statement, the contents of the
EEprom device is read by the processor and put in RAM memory (in the EEprom
register group). The consistency is checked using the checksum calculated at the
previous storage.
The EEstore statement forces a store procedure of the data in the EEprom group
to the EEprom device.
It is important to understand that when an EEProm register i read or written, it is
affecting only the image held in RAM memory. To actually store the contents, an
EEstore instruction has to be executed.
User's Manual 5.1 Inmotion Technologies AB
Doc. No.9032 0027 01 (B), Rev. 11.07.2001
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