FT221XS-R datasheet(15/45 Pages) FTDI

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FT221X USB 8-BIT SPI/FT1248 IC Datasheet

Version 1.3

Document No.: FT_000630 Clearance No.: FTDI# 263

Figure 5.2: FT1248 Command Structure

5.2 Supported Commands on the FT1248 Interface

The FT1248 interface can accept and decode up to 16 unique commands. At this time only 9 unique

commands are implemented as shown below.

Command

Identifier

Description

write

0x00

Write request command

read

0x01

Read request command

read modem status

0x02

Read modem status command, users may wish to emulate

modem status control. A RMS command returns status bits

RTS and DTR

write modem status

0x03

Write modem status command, users may wish to emulate

modem status control. A WMS command allows users to set

status bits: DCD, RI, DSR, CTS

write buffer flush

0x04

Write buffer flush request

– This command is used to indicate

to the FT1248 slave that its write buffers should be flushed

rather than wait for any latency timers to expire. If this

command is received the FT1248 block will flag the upstream

controllers (USB FIFOs etc) to flush their write buffers

regardless of what content is present in the FT1248 write

CMD[3]

BWID 2-bit BWID 4-bit

CMD[2]

BWID 8-bit

CMD[1]

CMD[0]

LSB

MSB

1-bit Bus

Width

CMD[3]

CMD[2]

CMD[1]

CMD[0]

2-bit Bus

Width

CMD[3]

CMD[2]

CMD[1]

CMD[0]

4-bit Bus

Width

CMD[3]

CMD[2]

CMD[1]

CMD[0]

8-bit Bus

Width

CMD[3]

CMD[2]

CMD[1]

CMD[0]

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