CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 103
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CS5535-UDCF
Manufacturer Part Number
CS5535-UDCF
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.CS5535-UDCF.pdf
(579 pages)
Specifications of CS5535-UDCF
Operating Temperature (min)
0C
Operating Temperature (max)
85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
Part Number:
CS5535-UDCF
Manufacturer:
AMD
Quantity:
20 000
- Current page: 103 of 579
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Universal Serial Bus Controller
5.5.4
The USB host interacts with USB devices through the Host
Controller. The host is responsible for:
• Detecting the attachment and removal of USB devices.
• Managing control flow between the host and USB
• Managing data flow between the host and USB devices.
• Collecting status and activity statistics.
• Providing power to attached USB devices.
The USB system software on the host manages interac-
tions between USB devices and host-based device soft-
ware. There are five areas of interactions between the USB
system software and device software:
1)
2)
3)
4)
5)
Whenever possible, the USB system software uses exist-
ing host system interfaces to manage the above interac-
tions.
The OHCI specification for the Universal Serial Bus is a
register-level description of a host controller for the Univer-
AMD Geode™ CS5535 Companion Device Data Book
devices.
U
SB
Device enumeration and configuration.
Isochronous data transfers.
Asynchronous data transfers.
Power management.
Device and bus management information.
O
PERATIONAL
Host Controller
W
U
RITE
SB
S
USPEND
W
U
S
RITE
SB
OFTWARE
U
Figure 5-9. USB Host Controller FSM
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PERATIONAL
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ESET
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sal Serial Bus, which in turn is described by the Universal
Serial Bus specification. OHCI allows multiple host control-
ler vendors to design and sell host controllers with a com-
mon software interface, freeing them from the burden of
writing and distributing software drivers. The design goal
has been to balance the complexity of the hardware and
software so that OHCI is more than the simplest possible
host controller for USB yet not the most complex possible.
The Host Controller has four USB states visible to the host
controller driver via the operational registers: U
TIONAL
states define the Host Controller responsibilities relating to
USB signaling and bus states. The USB states are
reflected in the HostControllerFunctionalState field of the
HcControl register. The Host Controller may only perform a
single state transition. During a remote wakeup event, the
Host Controller may transition from U
U
PCI memory mapped I/O. The functional state machine
(FSM) is shown in Figure 5-9.
5.5.5
The USB Interface includes the integrated Root Hub with
two external ports, Port 1 and Port 2, as well as the Serial
Interface Engine (SIE) and USB clock generator. The inter-
face combines responsibility for executing bus transactions
requested by the Host Controller as well as the hub and
port management specified by USB.
U
SB
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. The Host Controller interface registers are
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103
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-
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