AT85C51SND3Bx
Pipe Configuration
The following flow must be respected in order to activate a Pipe:
Figure 66. Pipe activation flow:
Pipe
Activation
UPCONX
PENABLE=1
Enablethepipe
SelectthePipetype:
UPCFG0X
PTYPE
PTOKEN
*Type(Control,Bulk,Interrupt)
*Token(IN,OUT ,SETUP)
*Endpointnumber
PEPNUM
UPCFG1X
ConfigurethePipememory:
*Pipesize
*Numberofbanks
PSIZE
PBK
CFGMEM
No
CFGOK=1
Yes
ERROR
UPCFG2X
INTFRQ
(interruptonly)
Configurethepollinginterval
forInterruptpipe
Pipeactiv ated
and f reezed
Once the Pipe is activated (EPEN set) and, the hardware is ready to send requests to
the Device.
When configured (CFGOK = 1), only the Pipe Token (PTOKEN) and the polling interval
for Interrupt pipe can be modified.
A Control type pipe supports only 1 bank. Any other value will lead to a configuration
error (CFGOK = 0).
A clear of PEN will reset the configuration of the Pipe. All the corresponding Pipe regis-
ters are reset to there reset values. Please refers to the Memory Management chapter
for more details.
Note:
The firmware has to configure the Default Control Pipe with the following parameters:
Type: Control
Token: SETUP
•
•
•
•
Data bank: 1
Size: 64 Bytes
The firmware asks for 8 bytes of the Device Descriptor sending a GET_DESCRIPTOR
request. These bytes contains the MaxPacketSize of the Device default control endpoint
and the firmware re-configures the size of the Default Control Pipe with this size
parameter.
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7632A–MP3–03/06
ATMEL [ ATMEL ]
