參數(shù)資料
型號: 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
文件頁數(shù): 59/158頁
文件大?。?/td> 724K
代理商: ISP1761
9397 750 13258
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 12 January 2005
59 of 158
Philips Semiconductors
ISP1761
Hi-Speed USB OTG controller
ISO interrupt
INTL interrupt
ATL Interrupt
SOF—start of frame interrupt for the data transfer.
A static PTD that schedules inside the ISP1761 shared memory allows using the
NextPTD mechanism that will enable the Host Controller driver to schedule the multiple
PTDs that are of single endpoint and reduce the interrupt to the CPU.
The NextPTD traversal rules defined by the ISP1761 hardware are:
1. Start the ATL header traversal.
2. If the current PTD is active and not done, perform the transaction.
3. Follow the next link pointer.
4. If PTD is not active and done, jump to the next PTD.
5. If the next link pointer is NULL, it means the end of the traversal.
(1) The NULL pointer terminates goes to the next link.
Fig 13. NextPTD traversal rule
PTD DONE
EXECUTE
THE PTD
INCREMENT
THE PTD
EXECUTE
THE PTD
END THE
SCHEDULE
END THE
SCHEDULE
null pointer
(1)
004aaa585
START PTD
SCHEDULE
follow the next link pointer
follow the next link pointer
horizontal
link pointer
vertical
link pointer
no
yes
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