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): 95/164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
35 of 163
NXP Semiconductors
ISP1761
Hi-Speed USB OTG controller
[1]
For details on register bit description, refer to Ref. 2 “Enhanced Host Controller Interface Specication for
8.2 EHCI operational registers
8.2.1 USBCMD register
The USB Command (USBCMD) register indicates the command to be executed by the
serial host controller. Writing to this register causes a command to be executed. Table 15
shows the USBCMD register bit allocation.
Bit
23
22
21
20
19
18
17
16
Symbol
reserved
Reset
00000000
Access
RRRRRRRR
Bit
15
14
13
12
11
10
9
8
Symbol
EECP[7:0]
Reset
00000000
Access
RRRRRRRR
Bit
7
6
5
4
3
2
1
0
Symbol
IST[3:0]
reserved
ASPC
PFLF
reserved
Reset
10000110
Access
RRRRRRRR
Table 14.
HCCPARAMS - Host Controller Capability Parameters register (address 0008h) bit
description
Bit
Symbol
Description[1]
31 to 16 -
reserved; write logic 0
15 to 8
EECP[7:0]
EHCI Extended Capabilities Pointer: Default = implementation
dependent. This optional eld indicates the existence of a capabilities list.
7 to 4
IST[3:0]
Isochronous Scheduling Threshold: Default = implementation
dependent. This eld indicates, relative to the current position of the
executing host controller, where software can reliably update the
isochronous schedule.
3
-
reserved; write logic 0
2
ASPC
Asynchronous Scheduling Park Capability: Default = implementation
dependent. If this bit is set to logic 1, the host controller supports the park
feature for high-speed Transfer Descriptors in the asynchronous schedule.
1
PFLF
Programmable Frame List Flag: Default = implementation dependent. If
this bit is cleared, the system software must use a frame list length of 1024
elements with this host controller.
If PFLF is set, the system software can specify and use a smaller frame
list and congure the host through the USBCMD register FLS eld.
0
-
reserved; write logic 0
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