Kontron VM62 - Manual (Page 32)

VM62(A) / VM42(A) User’s Manual Chapter 2 Functional Description
2.6 Special Functions
2.6.1 Real-Time Clock
The RTC (V3021 3-wire serial interface) is a 1-bit device which is accessible over the CS6 of the 68EN360. Its
timekeeping features include :-
• seconds, minutes, hours, day of month, month, year, week day and week number in BCD format.
• leap year and week number correction
• standby supply smaller than 1
µ
A
See also the Software Configuration chapter in this manual and the V3021 data sheet.
2.6.2 EEPROM
The serial EEPROM is a 1-bit device which is accessible over the SPI Interface (3-wire Interchip) of the 68EN360. The
first half of the EEPROM (1 kbit) is reserved for factory data, including Board ID codes, Internet/Ethernet addresses, boot
information etc. The second half of the EEPROM is available for the user. See also the Software Configuration chapter in
this manual.
For more information on the EEPROM, please refer to the XICOR X25C02 data sheet.
2.6.3 TICK Generator
The 68EN360 internal Periodic Interrupt Timer is used by the PEP real-time operating system as TICK generator.
For more information please refer to the 68EN360 User’s Manual.
2.6.4 On-board Bus Error Timer
The VM62(A) / VM62(A) provides an on-board bus error timer. An 8
µ
s timeout timer monitors the cycle lengths of data
transfers to and from locations beyond the bussizer, including on-board I/O, CXC, SRAM, AutoBahn and some VME.
After a timeout occurs, it generates an on-board BERR signal for error termination. This timer is enabled/disabled via the
board control/status register, which also supplies a timeout status bit in order to identify bus errors generated by the on-
board bus error timer.
There are four cases of bus error.
Cause Timeout Enable / Disable possible
Reserved address BERR0
On-board BERR1
VME BERR2
Chip selects 68EN360
100ns
8
µ
s
128
µ
s
programmable
None
Yes, set in board control register
Yes, set in VMEbus control register
Yes, set in 68EN360 register
May 17, 1996 © 1995 PEP Modular Computers Page 2-17