参数资料
型号: ISP1561BM,557
厂商: ST-ERICSSON
元件分类: 总线控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP128
封装: 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-420-1, LQFP-128
文件页数: 30/103页
文件大小: 457K
代理商: ISP1561BM,557
ISP1561_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 5 March 2007
32 of 103
NXP Semiconductors
ISP1561
HS USB PCI Host Controller
10.2 USB bus states
Reset state — When the USB bus is in the reset state, the USB system is stopped.
Operational state — When the USB bus is in the active state, the USB system is
operating normally.
Suspend state — When the USB bus is in the suspend state, the USB system is
stopped.
Resume state — When the USB bus is in the resume state, the USB system is operating
normally.
11. USB Host Controller registers
Each Host Controller contains a set of on-chip operational registers that are mapped into
uncached memory of the system addressable space. This memory space must begin on a
DWORD (32-bit) boundary. The size of the allocated space is dened by the initial value in
the BAR0 register. HCDs must interact with these registers to implement USB and legacy
support functionality.
After the PCI enumeration driver nishes the PCI device conguration, the new base
address of these memory-mapped operational registers is dened in BAR0. The HCD can
access these registers by using the address of base address value + offset. Table 42
contains a list of Host Controller registers.
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