Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.8
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 http://www.ftdichip.com 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
TXE#
CMD3
MIOSIO[0]
TXE#
0
0
CMD2
0
CMD1 CMD0
B7
B6
B5
B4
B3
B2
B1
B0
PULLED HIGH
MIOSIO[7:1]
RXF#
MISO
RXF#
TXE#
ACK
Figure 4.10: FT1248 1-bit Mode Protocol (WRITE)
SCLK
SS_n
COMMAND PHASE
BUS TURNAROUND
READ DATA
BUS TURNAROUND
CMD3
MIOSIO[0]
TXE#
0
0
CMD2
0
CMD1 CMD0
B7
B6
B5
B4
B3
B2
B1
B0
TXE#
PULLED HIGH
MIOSIO[7:1]
RXF#
MISO
RXF#
RXF# ACK
Figure 4.11: FT1248 1-bit Mode Protocol (READ)
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