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FT221XS-R 数据表(PDF) 15 Page - Future Technology Devices International Ltd.

部件名 FT221XS-R
功能描述  Future Technology Devices International Ltd.
PDF  45 Pages
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制造商  FTDI [Future Technology Devices International Ltd.]
网页  http://www.ftdichip.com
标志 FTDI - Future Technology Devices International Ltd.

FT221XS-R 数据表(HTML) 15 Page - Future Technology Devices International Ltd.

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Copyright © 2013 Future Technology Devices International Limited
15
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]
X
LSB
MSB
0
1
2
3
4
5
6
7
1-bit Bus
Width
CMD[3]
X
X
CMD[2]
X
CMD[1]
CMD[0]
X
0
1
2
3
4
5
6
7
2-bit Bus
Width
CMD[3]
0
X
CMD[2]
X
CMD[1]
CMD[0]
X
0
1
2
3
4
5
6
7
4-bit Bus
Width
CMD[3]
X
0
CMD[2]
X
CMD[1]
CMD[0]
X
0
1
2
3
4
5
6
7
8-bit Bus
Width
CMD[3]
X
X
CMD[2]
0
CMD[1]
CMD[0]
X
0
1
2
3
4
5
6
7



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