IOBUS0 datasheet(63/88 Pages) FTDI

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Datasheet

Vinculum-II Embedded Dual USB Host Controller IC

V ers ion 1 .7

Doc ument N o.: FT _000138 C learance N o.: FT DI# 1 43

Time

Description

Minimum

Typical

Maximum

Unit

CLKOUT period

20.83

CLKOUT high period

9.38

10.42

11.46

CLKOUT low period

9.38

10.42

11.46

CLKOUT to RXF#

7.83

CLKOUT to

read DATA valid

7.83

OE# to read DATA valid

7.83

CLKOUT to OE#

7.83

RD# setup time

RD# hold time

t10

CLKOUT TO TXE#

7.83

t11

Write DATA setup time

t12

Write DATA hold time

t13

WR# setup time

t14

WR# hold time

Table 6.19 Synchronous FIFO mode Read / Write Timing

6.8 General Purpose Timers

In VNC2 there are 4 General Purpose Timers available. Three are available to the designer and one is

reserved for the RTOS.

The timers have the following features:



16 bit



Count down



One shot and auto-reload



enable



Interrupt on zero

6.9 Pulse Width Modulation

VNC2 provides 8 Pulse Width Modulation (PWM) outputs. These can be used to generate PWM signals

which can be used to control motors, DC/DC converters, AC/DC supplies, etc. Further information is

available in an Application Note AN_140 - Vinculum-II PWM Example.

The features of the PWM module are as follows:



8 PWM outputs



A trigger input



8-bit prescaler



16-bit counter

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