FT232H datasheet(28/65 Pages) FTDI

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Document No.: FT_000288

FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC

Datasheet Version 1.81

Clearance No.: FTDI #199

Name

Min

Nom

Max

Units

Comments

16.67

CLKOUT period

7.5

8.33

9.17

CLKOUT high period

7.5

8.33

9.17

CLKOUT low period

CLKOUT to RXF#

CLKOUT to read DATA valid

OE# to read DATA valid

7.5

16.67

OE# setup time

OE# hold time

7.5

16.67

RD# setup time to CLKOUT (RD# low after OE# low)

t10

RD# hold time

t11

CLKOUT TO TXE#

t12

7.5

16.67

Write DATA setup time

t13

Write DATA hold time

t14

7.5

16.67

WR# setup time to CLKOUT (WR# low after TXE# low)

t15

WR# hold time

Table 4.1 FT245 Synchronous FIFO Interface Signal Timings

This mode uses a synchronous interface to get high data transfer speeds. The chip drives a 60 MHz

CLKOUT clock for the external system to use.

Note that Asynchronous FIFO mode must be selected in the EEPROM before selecting the Synchronous

FIFO mode in software.

4.4.1 FT245 Synchronous FIFO Read Operation

A read operation is started when the chip drives RXF# low. The external system can then drive OE# low

to turn the data bus drivers around before acknowledging the data with the RD# signal going low. The

first data byte is on the bus after OE# is low. The external system can burst the data out of the chip by

keeping RD# low or it can insert wait states in the RD# signal. If there is more data to be read it will

change on the clock following RD# sampled low. Once all the data has been consumed, the chip will drive

RXF# high. Any data that appears on the data bus, after RXF# is high, is invalid and should be ignored.

4.4.2 FT245 Synchronous FIFO Write Operation

A write operation can be started when TXE# is low. WR# is brought low when the data is valid. A burst

operation can be done on every clock providing TXE# is still low. The external system must monitor TXE#

and its own WR# to check that data has been accepted. Both TXE# and WR# must be low for data to be

accepted.

FT232H Datasheet(PDF) 28 Page - Future Technology Devices International Ltd.

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