Step Technica MKY02, User Manual

Page: 38 / 73

MKY02 User’s Manual
(for Hi-speed Link System)
3 - 8
3.3 Connecting Network Interface
This section describes connection of a network interface (“network I/F”).
The MKY02 is a HUB IC with eight ports.
The MKY02 has one communication mode select pin common to all ports and eight sets of network I/F pins.
Port 0 has three network I/F pins: RXD0, TXE0, and TXD0.
Ports 1 to 7 correspond to the RXD1 pin to RXD7 pin and the TXEl pin to TXE7 pin, respectively, but there
is no individual TXDn pin. There is one common TXD17 pin.
3.3.1 Selecting Communication Mode
When the specification of the HLS containing a HUB configured using the MKY02 is full-duplex mode, fix
the FH pin (pin 51) at High. When the specification is half-duplex mode, fix the FH pin at Low (Fig. 3.5).
In addition, conform the specification of the TRX (driver/receiver components) of the network cable con-
nected to each port to the setting of the FH pin.
In half-duplex mode, signals output from the TXD pins of the MKY02 may be input
directly to the RXD pins of the MKY02 while the MKY02 is sending command packets
(CP). The MKY02 is designed not to input data when the TXE pin is High when operated
in half-duplex mode, so there is no problem.
3.3.2 Connection of Port 0
Connect the TRX of port 0 to three network I/F pins: RXD0, TXE0, and TXD0 (Fig. 3.6).