參數(shù)資料
型號： ISP1362
廠商： NXP Semiconductors N.V.
英文描述： Single-chip Universal Serial Bus On-The-Go controller
中文描述： 單芯片通用串行總線和On - The - Go控制器
文件頁數(shù)： 34/150頁
文件大小： 647K
代理商： ISP1362
Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Product data
Rev. 03
—
06 January 2004
34 of 150
9397 750 12337
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
11.4 Host Negotiation Protocol (HNP)
HNP is used to transfer control of the host role between the default host (A-device)
and the default peripheral (B-device) during a session. When the A-device is ready to
give up its role as a host, it will condition the B-device by SetFeature (b_hnp_enable)
and will go into
‘
suspend
’
. If the B-device wants to use the bus at that time, it signals
a
‘
disconnect
’
to the A-device. Then, the A-device will take the role of a peripheral
and the B-device will take the role of a host.
11.4.1
Sequence of HNP events
The sequence of events for HNP as observed on the USB bus is illustrated in
Figure 17
.
As can be seen in
Figure 17
:
1. The A-device completes using the bus and stops all bus activity (that is,
suspends the bus).
2. The B-device detects that the bus is idle for more than 5 ms and begins HNP by
turning off the pull-up on DP. This allows the bus to discharge to the SE0 state.
3. The A-device detects SE0 on the bus and recognizes this as a request from the
B-device to become a host. The A-device responds by turning on its DP pull-up
within 3 ms of
fi
rst detecting SE0 on the bus.
4. After waiting for 30
μ
s to ensure that the DP line is not HIGH because of the
residual effect of the B-device pull-up, the B-device notices that the DP line is
HIGH and the DM line is LOW (that is, J state). This indicates that the A-device
has recognized the HNP request from the B-device. At this point, the B-device
becomes a host and asserts bus reset to start using the bus. The B-device must
assert the bus reset (that is, SE0) within 1 ms of the time that the A-device turns
on its pull-up.
5. When the B-device completes using the bus, it stops all bus activity. Optionally,
the B-device may turn on its DP pull-up at this time.
Fig 17. HNP sequence of events.
A-device
1
5
7
2
3
4
6
8
B-device
004aaa079
DP Composite
Legend
DP driven
Pull-up dominates
Pull-down dominates
Normal bus activity
相關(guān)PDF資料
PDF描述
ISP1362BD Single-chip Universal Serial Bus On-The-Go controller
ISP1362EE Single-chip Universal Serial Bus On-The-Go controller
ISP1501 Hi-Speed Universal Serial Bus peripheral transceiver
ISP1520 Hi-Speed Universal Serial Bus hub controller
ISP1520BD Hi-Speed Universal Serial Bus hub controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISP1362BD 功能描述:USB 接口集成電路 USB OTG 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
ISP1362BD,118 功能描述:USB 接口集成電路 USB OTG 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
ISP1362BD,151 功能描述:USB 接口集成電路 USB OTG 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
ISP1362BD,157 功能描述:USB 接口集成電路 USB OTG 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
ISP1362BD157 制造商:NXP Semiconductors 功能描述:IC CONTROLLER USB-OTG 64LQFP 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB OTG 64-LQFP
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