FT232H datasheet(39/65 Pages) FTDI

39 / 65 page

Document No.: FT_000288

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

Datasheet Version 1.81

Clearance No.: FTDI #199

4.9.1 Outgoing Fast Serial Data

To send fast serial data out of the FT232H, the external device must drive the FSCLK clock. If the FT232H

has data ready to send, it will drive FSDO output low to indicate the start bit. It will not do this if it is

currently receiving data from the external device. This is illustrated in Figure 4.18

Figure 4.18 Fast Serial Interface Output Data

Notes :-

1. The first bit output (Start bit) is always 0.

2. FSDO is always sent LSB first.

3. The last serial bit output is the source bit (SRCE) is always 0.

4. If the target device is unable to accept the data when it detects the START bit, it should stop the

FSCLK until it can accept the data.

4.9.2 Incoming Fast Serial Data

An external device is allowed to send data into the FT232H if FSCTS is high. On receipt of a zero START

bit on FSDI, the FT232H will drop FSCTS on the next positive clock edge. The data from bits 0 to 7 are

then clocked in (LSB first). The last bit (DEST) determines where the data will be written to. This bit is

always 0 with the FT232H. This is illustrated in Figure 4.19

Figure 4.19 Fast Serial Interface Input Data

Notes:-

1. The first bit input (Start bit) is always 0.

2. FSDI is always received LSB first.

3. The last received serial bit is the destination bit (DEST) is always 0.

The target device should ensure that FSCTS is high before it sends data. FSCTS goes low after

data bit 0 (D0) and stays low until the chip can accept more data.

FSCLK

FSDO

SRCE

Start

Bit

Data Bits - LSB first

Source

Bit

FSCLK

FSDI

DEST

Start

Bit

Data Bits - LSB first

Destination

Bit

FSCTS

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