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| 型號(hào)： | ISP1761 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Hi-Speed Universal Serial Bus On-The-Go controller |
| 中文描述： | 高速通用串行總線和On - The - Go控制器 |
| 文件頁(yè)數(shù)： | 86/158頁(yè) |
| 文件大小： | 724K |
| 代理商： | ISP1761 |
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9397 750 13258
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 12 January 2005
86 of 158
Philips Semiconductors
ISP1761
Hi-Speed USB OTG controller
9.4 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 using 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.
9.4.1
Sequence of HNP events
The sequence of events for HNP as observed on the USB bus is illustrated in
Figure 14
.
As can be seen in
Figure 14
:
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 first 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 activities. Optionally, the
B-device may turn on its DP pull-up at this time.
6. The A-device detects lack of bus activity for more than 3 ms and turns off its
DP pull-up. Alternatively, if the A-device has no further need to communicate with the
B-device, the A-device may turn off V
BUS
and end the session.
Fig 14. 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 |
|---|---|
| ISP1761BE | Hi-Speed Universal Serial Bus On-The-Go controller |
| ISP1761ET | Hi-Speed Universal Serial Bus On-The-Go controller |
| ISP2100A | Telecommunication IC |
| ISP2100BN4 | Microprocessor |
| ISP2300 | Controller Miscellaneous - Datasheet Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1761BE | 功能描述:USB 接口集成電路 USB HS OTG CTRLR RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)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 |
| ISP1761BE,518 | 功能描述:USB 接口集成電路 USB HS OTG CONTROLLER RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)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 |
| ISP1761BE,551 | 功能描述:USB 接口集成電路 DO NOT USE ORDER -T OR NO "-" RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)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 |
| ISP1761BE,557 | 功能描述:USB 接口集成電路 USB HS OTG CTRLR RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)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 |
| ISP1761BE518 | 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB OTG 128LQFP |
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