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FT121Q-R 数据表(PDF) 14 Page - Future Technology Devices International Ltd.

部件名 FT121Q-R
功能描述  Enhanced USB Device Controller with SPI Slave IC
PDF  46 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.

FT121Q-R 数据表(HTML) 14 Page - Future Technology Devices International Ltd.

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Copyright © 2014 Future Technology Devices International Limited
14
Document No.: FT_000648
FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC
Datasheet Version 1.2
Clearance No.: FTDI#
312
5
Endpoint Buffer Management
The FT121 has 2 modes of operation for command and memory management: the default mode and the
enhanced mode. The buffer management schemes are different in these two modes. Upon reset the
default mode is functional. The enhanced mode is activated when any of the Set Endpoint Configuration
commands (B0h – BFh) are received.
5.1 Endpoint Buffer Management in Default Mode
In default mode the FT121 has 3 bi-directional endpoints (EP0, EP1 and EP2). EP0 is the control endpoint,
with 16 bytes maximum packet size for both the control OUT and control IN endpoints. EP1 can be used
as either a bulk endpoint or an interrupt endpoint, with 16 bytes maximum packet size for both OUT and
IN endpoints. Table 5.1 shows the endpoint type and maximum packet size for EP0 and EP1.
Endpoint
Number (EP)
Endpoint
Index (EPI)
Endpoint
Direction
Transfer Type
Max Packet Size
0
0
1
OUT
IN
Control
Control
16
16
1
2
3
OUT
IN
Bulk/Interrupt
Bulk/Interrupt
16
16
Table 5.1 Endpoint configuration for EP0 and EP1
EP2 is the primary endpoint. It can be configured as either a bulk/interrupt or isochronous endpoint. The
maximum packet size allowed for EP2 depends on the mode of configuration through the Set Mode
command. Table 5.2 shows all the 4 endpoint configuration modes for EP2.
EP2 Endpoint
Configuration
Mode
Endpoint
Index (EPI)
Endpoint
Direction
Transfer Type
Max Packet Size
0
(default)
4
5
OUT
IN
Bulk/Interrupt
Bulk/Interrupt
64
64
1
4
OUT
Isochronous
128
2
5
IN
Isochronous
128
3
4
5
OUT
IN
Isochronous
Isochronous
64
64
Table 5.2 Endpoint configuration for EP2



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