X3 primary i/o interface (j3) – ADLINK ETX-PVR User Manual
Page 37
Chapter 3
Hardware
ETX-PVR
Reference Manual
31
X3 Primary I/O Interface (J3)
The J3, 100-pin connector is used for Floppy or Printer (LPT1) interface, Serial interfaces (COM1 and
COM2), Mouse and Keyboard interfaces, and the video interfaces for standard VGA and LVDS video. This
section briefly describes each of these features. Refer to
for pin definitions of the X3
interface.
Floppy Interface
The Floppy interface shares signal lines with the Parallel interface and is provided by the Super I/O chip
(SCH3112I-NU). The BIOS settings determine which one is operational.
•
Supports two floppy drives
•
Supports 16 bytes of FIFO with data rates up to 1 Mbps
Parallel Interface
Parallel interface supports standard parallel, Bi-directional, ECP and EPP protocols. The Super I/O chip
(SCH3112I-NU) provides the parallel interface signals, which are shared with the floppy drive interface.
•
Shares signal lines with the Floppy interface, and the BIOS settings determine which one is operational
•
Supports Standard Printer Port (SPP), Enhanced Parallel Port (EPP) and Enhanced Capabilities Port
(ECP)
Serial Ports 1 and 2
The Super I/O chip (SCH3112I-NU) provides the circuitry for two serial port UARTs. The signals for serial
ports 1 and 2 are provided to the baseboard through connector J3. However, the baseboard must provide the
serial transceivers to make use of this feature. The serial port features are:
•
Two individual 16550-compatible UARTs
•
Programmable word length, stop bits and parity
•
16-bit programmable baud rate generator and Interrupt generator
•
Loop-back mode
•
Two individual 16-bit FIFOs
PS/2 Keyboard
The signal lines for a PS/2 keyboard are provided through the J3 connector from the Super I/O chip
(SCH3112I-NU).
PS/2 Mouse
The signal lines for a PS/2 mouse are provided through the J3 connector from the Super I/O chip
(SCH3112I-NU).
VGA Interface
The N455 version of the CPU provides direct VGA outputs with a resolution up to 1400x1050 @ 60Hz. The
D525 version of the CPU provides resolutions up to 2048x1536 @ 60Hz.
The analog display output provides an RGB signal output as well as an HSYNC and a VSYNC signal. The
display function contains a RAM-based Digital-to-Analog Converter (RAMDAC) that transforms the digital
data from the graphics and video subsystems to analog data for CRT monitors.