Cirrus-logic EP93xx Manual de usuario Pagina 477

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DS785UM1 11-37
Copyright 2007 Cirrus Logic
Universal Serial Bus Host Controller
EP93xx User’s Guide
1
1
1
1
USBHCISts
Address:
0x8002_0084 - Read/Write
Default:
0x0000_0000
Definition:
Host Controller Interface. Some status bits reporting from USB host controller
to software.
Bit Descriptions:
RSVD: Reserved. Unknown During Read.
MBA: Host controller buffer access indication. When asserted, it
indicates that currently host controller is accessing data
buffer. It is a status bit reporting to software and software
does not need to take any action.
MSN: Host controller new frame. Software does not need to take
any action because it is a status about a new frame that is
generated.
RWU: Host controller remote wakeup. Software action when this
bit is asserted is implementation specific. It is a status bit
reporting a transition of internal state.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD
1514131211109876543210
RSVD RWU MSN MBA
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