TMP92CF30
2009-06-12
92CF30-416
3.16.7 Bus Interface and Access to FIFO
(1) CPU bus interface
The UDC prepares two types of FIFO access, single packet and dual packet. In
single packet mode, FIFO capacity that is implemented by hardware is used as large
FIFO. In dual packet mode, FIFO capacity is divided into two and used as two FIFOs.
It is also used as an independent FIFO. Even if the UDC is transmitting and
receiving to USB host, it can be used as an efficient bus by possible load to FIFO.
But control transfer type receives only single packet mode.
Epx_SINGLE signal in dual packet mode must be fixed to “0”. If this signal is fixed
to “0”, FIFO register runs in single mode.
Sample: Where endpoint 1 is used to dual packet of payload 64 bytes.
EP1_FIFO size
:
Prepare 128 bytes
EP1_SINGLE signal
:
Hold 0
EP1 Descriptor setting
Direction
:
Optional
Max payload size
:
64 bytes
Transfer
mode
:
Optional
Содержание TLCS-900/H1 Series
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