Datasheet

680
32072H–AVR32–10/2012
AT32UC3A3
27.8.1.6 Features Register
Register Name: UFEATURES
Access Type: Read-Only
Offset: 0x081C
Read Value: -
• ENHBISOn: High Bandwidth Isochronous Feature for Endpoint n
1: The high bandwidth isochronous is supported.
0: The high bandwidth isochronous is not supported.
• DATABUS: Data Bus 16-8
1: The UTMI data bus is a 16-bit data path at 30MHz.
0: The UTMI data bus is a 8-bit data path at 60MHz.
• BYTEWRITEDPRAM: DPRAM Byte-Write Capability
1: The DPRAM is natively byte-write capable.
0: The DPRAM byte write lanes have shadow logic implemented in the USBB IP interface.
• FIFOMAXSIZE: Maximal FIFO Size
This field indicates the maximal FIFO size, i.e., the DPRAM size:
31 30 29 28 27 26 25 24
--------
23 22 21 20 19 18 17 16
ENHBISO7 ENHBISO6 ENHBISO5 ENHBISO4 ENHBISO3 ENHBISO2 ENHBISO1 DATABUS
15 14 13 12 11 10 9 8
BYTEWRITE
DPRAM
FIFOMAXSIZE DMAFIFOWORDDEPTH
76543210
DMABUFFE
RSIZE
DMACHANNELNBR EPTNBRMAX
FIFOMAXSIZE Maximal FIFO Size
0 0 0 < 256 bytes
0 0 1 < 512 bytes
0 1 0 < 1024 bytes
0 1 1 < 2048 bytes
1 0 0 < 4096 bytes
1 0 1 < 8192 bytes
1 1 0 < 16384 bytes
1 1 1 >= 16384 bytes