FT232HL 参数 Datasheet PDF下载

Document No.: FT_000288

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

Datasheet Version 1.3

Clearance No.: FTDI #199

4.6.2 FT1248: 1-bit interface

The FT1248 Interface transfers data over different bus widths (1-bit, 2-bit, 4-bit and 8-bit). Figure 4.21

and Figure 4.22 illustrates the waveform detailing the FT1248 write and read protocol operating in 1-bit

mode with flow control. Please refer to the application notes AN_167_FT1248 Parallel Serial Interface

Basics available at

for more details regarding 1-bit without flow control, 2-bit, 4-

bit and 8-bit modes.

SCLK

SS_n

COMMAND PHASE

WRITE DATA

BUS TURNAROUND

BUS TURNAROUND

BUS TURNAROUND

MIOSIO[0]

TXE#

CMD3

0

0

CMD2

0

CMD1 CMD0

B7

B6

B5

B4

B3

B2

B1

B0

TXE#

MIOSIO[7:1]

PULLED HIGH

MISO

RXF#

TXE#

ACK

RXF#

Figure 4.10: FT1248 1-bit Mode Protocol (WRITE)

SCLK

SS_n

COMMAND PHASE

READ DATA

BUS TURNAROUND

BUS TURNAROUND

MIOSIO[0]

TXE#

CMD3

0

0

CMD2

0

CMD1 CMD0

B7

B6

B5

B4

B3

B2

B1

B0

TXE#

MIOSIO[7:1]

PULLED HIGH

MISO

RXF#

RXF#

ACK

RXF#

Figure 4.11: FT1248 1-bit Mode Protocol (READ)

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