參數(shù)資料
型號： ISP1761BE,518
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP128
封裝： 14 X 20 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT425-1, LQFP-128
文件頁數(shù)： 152/164頁
文件大?。?/td> 767K
代理商： ISP1761BE,518
ISP1761_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 13 March 2008
87 of 163
NXP 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 rst detecting SE0 on the bus.
4. After waiting for 30
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.
Remark: The bus idle state will generate a DC suspend interrupt corresponding to the
toggle of the SUSP bit in the DcInterrupt register (address: 218h), when accordingly
enabled.
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
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