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USB channel
Channel 0
Channel 1
Channel 2
Channel 3
The BIOS supports the use of a USB keyboard and/or mouse in lieu of a PS/2 device via the BIOS
customization tools (the feature is disabled by default). This USB legacy support provides emulation
of standard keyboards and/or mice and since it causes performance degradation should be enabled
only when the operating system being used also supports USB (the emulation is automatically
disabled once the operating system is running).
2.11 General Purpose I/O Lines
In order to support products that require a small number of internal input or output lines (such as
switches or LED indicators), the GL815E provides access to 8 general-purpose lines via a 12-pin
header. Each line can be programmed independently as an input or an output. The signals are
provided by the National Semiconductor PC87366 Super I/O device GPIO port 2. It is the
responsibility of the customer to provide suitable software to control these lines.
2.12 CMOS RAM & RTC
The chipset integrates a Motorola MC146818A compatible real-time clock (RTC) and 256 bytes of
CMOS RAM that is used by the BIOS to store configuration information. A replaceable primary
lithium coin cell or, optionally, a Super Cap backs up both the RTC and the CMOS RAM. The
former provides for approximately 5 years of unpowered backup. The SuperCap provides for at
least 1-hour life and eliminates cell replacement as a reason for scheduled maintenance.
The lithium coin cell is a CR2032 device.
The RTC includes a century byte and is supported by the BIOS to provide year 2000 compliance.
When the +5V standby power is applied to the motherboard, the RTC and the CMOS RAM are
powered from that rather than the lithium cell or the optional SuperCap.
2.13 Expansion Cards
The motherboard provides 7 expansion card slots, one of which supports either an ISA or a PCI
adapter.
AGP Slot
The motherboard provides a single universal AGP slot, supporting 1X, 2X and 4X adapter cards
and automatically switches the interface appropriate to the adapter. Since there is no physical
keying on the universal AGP connector, always ensure that the adapter is fitted correctly before
applying power. The AGP card retention mechanism is supported. An independent USB 1.1
compliant port is provided on the AGP interface.
PCI Slots
The motherboard provides 5 bus-master PCI 2.2 compliant slots, one of which is shared with an ISA
slot. The motherboard generates the 3.3Vaux supply to these slots using the 5V standby input from
the power supply. Always ensure that the 5V standby rail can support the required current when
using a PCI card that makes use of the 3.3Vaux supply.
GL815E Endura Motherboard Product Manual
Connector location
Rear I/O (bottom)
Rear I/O (top)
Header
AGP slot
Page 19 of 51
Controller
Controller 1
Controller 1
Controller 2
Controller 2
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