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參數(shù)資料
| 型號(hào)： | CY7C65640A |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | TetraHub High-Speed USB Hub Controller(TetraHub高速USB Hub控制器) |
| 中文描述： | TetraHub高速USB集線器控制器（TetraHub高速USB集線器控制器） |
| 文件頁(yè)數(shù)： | 3/21頁(yè) |
| 文件大?。?/td> | 513K |
| 代理商： | CY7C65640A |
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CY7C65640A
Document #: 38-08019 Rev. *H
Page 3 of 21
pull-up resistor turned off. In USB 1.x systems, no such chirp
sequence from the upstream hub will be seen, and TetraHub
will operate as a normal 1.x hub (operating at full speed).
4.2
After a USB Bus Reset, TetraHub is in an unaddressed, uncon-
figured state (configuration value set to 0). During the enumer-
ation process, the host will set the hub's address and configu-
ration by sending a SetCongfiguration request. Changing the
hub address will restore it to an unconfigured state.
For high-speed multi-TT support, the host must also set the
alternate interface setting to 1 (the default mode is single-TT).
Once the hub is configured, the full hub functionality is
available.
Enumeration
4.3
After TetraHub is configured in a high-speed system, it will be
in Single TT mode. The host may then set the hub into Multiple
TT mode by sending a SetInterface command. In Multiple TT
mode, each full-speed port is handled independently and thus
has a full 12-Mbps bandwidth available. In Single TT mode, all
traffic from the host destined for full- or low-speed ports will be
forwarded to all of those ports. This means that the 12-Mbps
bandwidth is shared by all full- and low-speed ports.
Multiple Transaction Translator Support
4.4
TetraHub supports a maximum of four downstream ports, each
of which may be marked as usable or removable in the
extended configuration (0xD2 EEPROM load, see section
8.2). Downstream D+ and D– pull-down resistors are incorpo-
rated in TetraHub for each port. Prior to the hub being
configured, the ports are driven SE0 (Single Ended Zero,
where both D+ and D– are driven LOW) and are set to the
unpowered state. Once the hub is configured, the ports are not
driven, and the host may power the ports by sending a
SetPortPower command to each port. After a port is powered,
any connect or disconnect event is detected by the hub. Any
change in the port state is reported by the hub back to the host
through the Status Change Endpoint (endpoint 1). Upon
receipt of SetPortReset command from the host, the hub will
Drive SE0 on the corresponding port
Put the port in an enabled state
Enable the green port indicator for that port (if not previously
overridden by the host)
Enable babble detection once the port is enabled.
Babble consists of either unterminated traffic from a
downstream port (or loss of activity), or a non-idle condition on
the port after EOF2. If babble is detected on an enabled port,
that port will be disabled. A ClearPortEnable command from
the host will also disable the specified port.
Downstream ports can be individually suspended by the host
with the SetPortSuspend command. If the hub is not
suspended, any resume will be confined to that individual port
and reflected to the host through a port change indication in
the Hub Status Change Endpoint. If the hub is suspended, a
resume on this port will be forwarded to the host, but other
resume events will not be seen on that port. The host may
resume the port by sending a ClearPortSuspend command.
Downstream Ports
4.5
The upstream port includes the transmitter and the receiver
state machine. The Transmitter and Receiver operate in high-
speed and full-speed depending on the current hub configu-
ration.
The transmitter state machine monitors the upstream facing
port while the Hub Repeater has connectivity in the upstream
direction. This monitoring activity prevents propagation of
erroneous indications in the upstream direction. In particular,
this machine prevents babble and disconnect events on the
downstream facing ports of this hub from propagating and
causing the hub to be disabled or disconnected by the hub to
which it is attached. This allows the Hub to only disconnect the
offensive port on detecting a babble from it.
Upstream Port
4.6
TetraHub includes interface signals for external port power
switches. Both ganged and individual (per-port) configurations
are supported, with individual switching being the default.
Initially all ports are unpowered. After enumerating, the host
may power each port by sending a SetPortPower command
for that port. The power switching and over-current detection
of downstream ports is managed by control pins connected to
an external power switch device. PWR [n]# output pins of the
CY7C65640A series are connected to the respective external
power switch's port power enable signals. (Note that each port
power output pin of the external power switch must be
bypassed with an electrolytic or tantalum capacitor as required
by the USB specification. These capacitors supply the inrush
currents, which occur during downstream device hot-attach
events.)
Power Switching
4.7
Over-current detection includes timed detection of 8 ms by
default. This parameter is configured from the external
EEPROM in a range of 0 ms to 15 ms for both an enabled port
and a disabled port individually. Detection of over-current on
downstream ports is managed by control pins connected to an
external power switch device.
The OVR[n]# pins of the CY7C65640A series are connected
to the respective external power switch's port over-current
indication (output) signals. Upon detecting an over-current
condition, the hub device reports the over-current condition to
the host and disables the PWR# output to the external power
device.
Over-current Detection
4.8
The USB 2.0 port indicators are also supported directly by
TetraHub. As per the specification, each downstream port of
the hub supports an optional status indicator. The presence of
indicators for downstream facing ports is specified by bit 7 of
the wHubCharacteristics field of the hub class descriptor. The
default TeraHub descriptor specifies that port indicators are
supported (wHubCharacteristics, bit 7 is set). If port indicators
are not included in the hub, this should be disabled by the
EEPROM.
Each port indicator is strategically located directly on the
opposite edge of the port which it is associated with. The
indicator provides two colors: green and amber. This is imple-
mented as two separate LEDs, one amber and the other
green. A combination of hardware and software control is used
Port Indicators
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| CY7C65640ALFXC | 制造商:Cypress Semiconductor 功能描述: |
| CY7C65640A-LFXC | 功能描述:USB 接口集成電路 USB 2.0 4 Port Hub COM RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| CY7C65640A-LFXCT | 功能描述:USB 接口集成電路 USB 2.0 4 Port Hub COM RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| CY7C65640A-LTXC | 功能描述:USB 接口集成電路 USB HS Controller RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| CY7C65640A-LTXCKM | 制造商:Cypress Semiconductor 功能描述: |
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