CP605
Functional Description
ID 25095, Rev. 07
© 2004 Kontron Modular Computers GmbH
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System Memory Interface
The 845GV integrates a system memory DDR SDRAM controller with a 64 bit wide interface
without ECC. The chipset supports PC200 and PC266 Double Data Rate (DDR) SDRAM for
system memory.
845GV Graphics Controller
The 845GV includes a highly integrated graphics accelerator and H/W Motion Compensation
engines for software MPEG2 decoding, delivering high performance 2D and 3D video capabil-
ities. The internal graphics controller provides interfaces to a standard CRT display. These in-
terfaces are only active when running in internal graphics mode.
2.3.2
I/O Controller Hub ICH4
The ICH4 is a highly integrated multifunctional I/O Controller Hub that provides the interface to
the PCI Bus and integrates many of the functions needed in today's PC platforms, for example,
Ultra DMA 100/66/33 controller, USB host controller supporting USB 2.0, LPC interface, FWH
Flash BIOS interface controller, LAN interface and an AC'97 digital controller. The ICH4 com-
municates with the host controller over a dedicated hub interface.
I/O Controller Hub Feature set comprises:
• PCI 2.2 interface with eight IRQ inputs
• Bus Master EIDE controller UltraDMA 100/66/33
• Three USB controllers with up to six USB 1.1 or USB 2.0 ports
• Hub interface with 845GV
• FWH interface
• LPC interface
• AC 97 2.1 interface
• Integrated LAN controller, 82559 style
• RTC controller
• Multimedia timer (additional timer)
2.4
Peripherals
The following standard peripherals are available on the CP605 board:
2.4.1
Timers
The CP605 is equipped with the following timers:
• Real-Time Clock
The ICH4 contains a MC146818A-compatible real-time clock with 256 bytes of
battery-backed RAM.
The real-time clock performs timekeeping functions and includes 256 bytes of
general purpose battery-backed CMOS RAM. Features include an alarm function,
programmable periodic interrupt and a 100-year calendar. All battery-backed CMOS
RAM data remains stored in an additional EEPROM. This prevents data loss.
• Counter/Timer
Three 8254-style counter/timers are included on the CP605 as defined for the
PC/AT.
