Keith & Koep GmbH
Functional specification
MT6N (MT606)
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von
49
3.11
Ethernet
The Ethernet Controller (LAN91C96 by SMSC) on the MT6N board supports the
IEEE 802.3 (ANSI 8802-3) Ethernet Standards. It is connected to a 10 Base-T filter
module. The Ethernet connector is of the type RJ45. The controller in the configura-
tion of MT6N provides:
•
6K Bytes of On-Chip RAM
•
Support of enhanced transmit queue management
•
Direct interface to ISA buses with no wait states
•
Fast access time (40ns)
•
Pipelined data path
•
Integrated 10Base-T Transceiver functions:
•
Driver and receiver
•
Link integrity test
•
Receive polarity detection and correction
•
10 Mb/s Manchester Encoding / Decoding and clock recovery
•
Automatic retransmission, bad packet rejection and transmit padding
•
Optional configuration via serial EEPROM interface (jumperless)
•
Two direct driven LEDs for diagnostics (transmit / receive indication)
3.12
Serial ports
The MT6 provides four kinds of serial ports:
•
USB
•
UART
•
IrDA
•
SPI
3.12.1
Serial port 0 - USB Device Controller
Serial port 0 is an universal serial bus device controller (UDC) that supports three
endpoints and can operate half-duplex at a baud rate of 12 Mbps (slave only, not a
host or hub controller).The UDC is USB-compliant and supports all standard device
requests is issued by the host. The external pins dedicated to this interface are
UDC+ and UDC-. The USB protocol uses differential signalling between the two
pins for half-duplex data transmission. A 1.5 KOhm pull-up resistor is connected to
the USB cable’s D+ signal to pull the UDC+ pin high when not driven. This signi-
fies the UDC is a high-speed, 12 Mbps device and provides the correct polarity for
data transmission.
Serial port 0 is accessible by an SL1-4 (four pin header). However, the user should
refer to the Universal Serial Bus Specification, Revision 1.0
1
for a full description
of the USB protocol and its operation.
3.12.2
Serial port 1 - UART
Serial port 1 is configured as an universal asynchronous receiver / transmitter
(UART) serial controller. A Maxim MAX3223 RS232 transceiver is used to man-
age the level conversion and line interface. The device has a power saving auto-
1. The latest revision of the Universal Serial Bus Specification Revision 1.0 can be accessed
via the World Wide Web Internet side at: http://www.teleport.com/~usb/
