User manual

Viglen BX130 – VIG385P User Manual

Programmed I/O operations usually require a substantial amount of processor

bandwidth. However, in multitasking operating systems, the bandwidth freed by bus

mastering IDE can be devoted to other tasks while disk transfers are occurring.

Real-time Clock, CMOS SRAM, and Battery

The clock provides a time-of-day clock and a multi-century calendar with alarm

features and century rollover.

The time, date, and CMOS values can be specified in the Setup program. The

CMOS values can be returned to their defaults by using the Setup program.

An external coin-cell battery powers the real-time clock and CMOS memory. When

the computer is not plugged into a wall socket, the battery has an estimated life of

three years. When the computer is plugged in, the 3.3-V standby current from the

power supply extends the life of the battery. The clock is accurate to ? 13

minutes/year at 25 ºC with 3.3V applied.

I/O Interface Controller

The disk drive adapter functions of the Super I/O chip include a floppy disk drive

controller that is compatible with industry standard 82077/765, a data separator,

write pre-compensation circuitry, decode logic, data rate selection, a clock generator,

drive interface control logic and interrupt and DMA logic. The wide range of functions

integrated onto the Super I/O greatly reduces the number of components required for

interfacing with floppy disk drives. The Super I/O supports 360 K, 720 K, 1.2 M, 1.44

M or 2.88 M disk drives and data transfer rates of 250 Kb/s, 500 Kb/s or 1 Mb/s. It

also provides two high-speed, 16550 compatible serial communication ports

(UARTs), one of which supports serial infrared communication. Each UART includes

a 16-byte send/receive FIFO, a programmable baud rate generator, complete

modem control capability and a processor interrupt system. Both UARTs provide

legacy speed with baud rate of up to 115.2 Kbps as well as an advanced speed with

baud rates of 250 K, 500 K, or 1 Mb/s, which support higher speed modems. The

Super I/O supports one PC-compatible printer port (SPP), Bi-directional Printer Port

(BPP), Enhanced Parallel Port (EPP) or Extended Capabilities Port (ECP). The

Super I/O provides functions that comply with ACPI (Advanced Configuration and

Power Interface), which includes support of legacy and ACPI power management

through an SMI or SCI function pin. It also features auto power management to

reduce power consumption. The IRQs, DMAs and I/O space resources of the Super

I/O can flexibly adjust to meet ISA PnP requirements, which support ACPI and APM

(Advanced Power Management).

Serial Ports

One 9-pin D-Sub serial port connector is located on the back panel and is compatible

with NS16C550 UARTs.