GE TELUM ASLP11, Справочное руководство

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Table 10: Interval timer functions
Interval Timer Functions
Function Counter 0 (System Timer)
Gate Always on
Clock In 1.193 MHz (OSC/12)
Out IRQ0 (INT1)
Function Counter 1 (Refresh Request)
Gate Always on
Clock In 1.193 MHz (OSC/12)
Out Refresh Request
Function Counter 2 (Speaker Tone)
Gate Programmable via Port $061
Clock In 1.193 MHz (OSC/12)
Out Speaker
The counter/timers are programmed by I/O accesses. A single control word
register controls the operation of all three counters. For more information on
programming and a detailed register description see the 8254 data sheet.
Real Time Clock
The RTC is a low-power clock that provides a time-of day clock and a 100-
year calendar with alarm features, but no battery backed operation. The time-
of-day function includes 14 control registers. Other features include maskable
interrupt sources and 242 bytes of general purpose CMOS RAM used by
system BIOS. Valid RAM data and time can be maintained after power down
through the use of an external battery source. The RTC is software
compatible to the Dallas DS1287 and the Motorola MC146818.
EIDE Interface
The ASLP11 offers an EIDE/ATAPI interface with two SATA channels. This
device is logically connected to the primary PCI bus. The signals of the
SATA interfaces are available at the rear connector The ASLP11 System
BIOS automatically detects a connected HDD or CD-ROM and enters the
corresponding drive parameters into the BIOS setup. This feature allows
faster and easier handling of varying types of EIDE hard disks.
USB Interface
The ASLP11 has some USB 2.0 channels. These are backward compatible to
USB 1.0/1.1. The USB host controller supports legacy Keyboard/Mouse
usage with USB–based keyboard and mouse without using additional
software drivers.
GE Intelligent Platforms – ASLP11 Hardware Reference Manual, Third Edition Page 47