VNC1L Datasheet, PDF (15/31 Pages) Future Technology Devices International Ltd. – Embedded USB Host Controller IC

Document Reference No.: FT_000030
Vinculum VNC1L Embedded USB Host Controller IC Datasheet Version 2.01
Clearance No.: FTDI# 50
5.1.1 UART Mode Signal Descriptions
Pin No.
Name
Type Description
31
TXD
Output Transmit asynchronous data output
32
RXD
Input Receive asynchronous data input
33
RTS#
Output Request To Send Control Output
34
CTS#
Input Clear To Send Control Input
35
DATAACK# Output Data Acknowledge (Data Terminal Ready Control) Output
36
DATAREQ# Input Data Request (Data Set Ready Control) Input
37
DCD#
Input Data Carrier Detect Control Input
Ring Indicator Control Input. RI# low can be used to resume the PC USB Host
38
RI#
Input
controller from suspend.
41
TXDEN
Output Enable Transmit Data for RS485 designs
Table 5.2 Data and Control Bus Signal Mode Options - UART Interface
In RS485 designs, a transmit data enable signal, TXDEN, may be used to signal that a transmit operation
is in progress. TXDEN will be set high one bit-time before data is transmitted and return low one bit time
after the last bit of a data frame has been transmitted.
The ring indicator pin, RI#, is used to wake up VNC1L from suspend mode. The suspend mode can be
entered using a firmware monitor command.
Copyright © 2009 Future Technology Devices International Limited
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