Kontron VM162 - Manual (Page 40)

VM162/VM172 Chapter 2 Functional Description
Page 2- 18 © PEP Modular Computers Juli 23, 1997
2.7 Special Functions
2.7.1 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.
For more details, please refer to the Programming Chapter in this manual and the V3021 data sheet.
2.7.2 Serial 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 Programming Chapter in this manual.
For more information on the EEPROM, please refer to the XICOR X25C02 data sheet.
2.7.3 TICK Timer
The 68EN360 internal Periodic Interrupt Timer is used by the PEP supported real-time operating sy-
stems as TICK generator.
For more information, please refer to the 68EN360 User’s Manual.
2.7.4 General Purpose Timer
There are four 16-bit general purpose timers available which are provided by the 68EN360. Two pair of
timers can cascaded internally or externally to form two 32-bit timers. Maximum period is 8.1s at
33MHz with a resolution of 30ns.
For more information please refer to the 68EN360 User’s Manual.
2.7.5 DMA Transfers
There are two independant fully programmable DMA channels available which are provided by the
68EN360. These IDMAs provide 32-bit address and 32-bit data capabiltity together with 32-bit byte
transfer counters. Fixed and rotating priority as well as single buffer, auto buffer or buffer chaining is
supported by the DMAs. With the IDMAs memory to memory transfers are possible with any combi-
nation of onboard and A23/D16 VME addresses.
For more information please refer to the 68EN360 User’s Manual.