Hardware manual

EUROCOM-17-5xx 1 Specification
Hardware Manual 13
1.3.6 Keyboard
Interface
The EUROCOM-17-5xx keyboard interface supports PS/2 compatible
keyboards. This interface can receive data from and transmit data to the
keyboard under interrupt control. The keyboard interface consists of two
registers: the data register and the control/status register.
1.3.7 Ethernet
Interface
The Ethernet interface is based on the Integrated Local Area
Communications Controller (ILACC - AM79C900).
A main feature of the ILACC and its on-chip DMA channel is the
flexibility and speed of communication. The internal Manchester
Encoder/Decoder of the ILACC is compatible with the IEEE-802.3
specification. Via the AUI connector on the front panel the
EUROCOM-17-5xx is attached to Ethernet (Cheapernet, 10BaseT)
networks.
1.3.8 SCSI Interface Single-ended 8/16 bit SCSI-2 signals are fed into row A and C of the
VMEbus P2 connector (X102). An ADAP-220 is plugged onto the rear
side of the backplane to interface to standard 8/16-bit SCSI connectors: a
50-pin flat cable connector, and a 68-pin, high density, half pitch
connector (SCSI-2 P cable). The ADAP-220 is also used to interface
between these types of cable, i.e. harddisks with different types of
connectors can be mixed in the system.
For 8-bit SCSI devices also the ADAP-200 can be used.
The NCR53C720 SCSI controller uses its own code fetching and SCSI
data transfer from the on-board DRAM. The processor executes SCSI
SCRIPTS to control the actions on the SCSI and the CPU bus. SCRIPTS
is a specially designed language for easy SCSI protocol handling. It
dramatically reduces the CPU activities. The SCRIPTS processor starts
SCSI I/O operations in approximately 500ns where traditional intelligent
host adapters require 2-8ms.
1.3.9 Serial I/O The EUROCOM-17-5xx offers four serial I/O lines, implemented by one
CL-CD2401 Multi Protocol Controller. CHAN.1 and CHAN.2 are RS232
two wired handshake interfaces. CHAN.3 and CHAN.4 use removable
serial interface level converters (SILC). As shipped, two RS232 level
converter SILCs are installed featuring hardware handshake as well as the
XON/XOFF protocol. Additional level converter plug-ins for RS422
and RS485 are available.
The baud rate generator is driven by 20MHz, allowing baud rates from
50b/s to 64kb/s.