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USB2512B-AEZG 参数 Datasheet PDF下载

USB2512B-AEZG图片预览
型号: USB2512B-AEZG
PDF下载: 下载PDF文件 查看货源
内容描述: USB 2.0高速集线器控制器 [USB 2.0 Hi-Speed Hub Controller]
分类和应用: 外围集成电路控制器PC时钟
文件页数/大小: 72 页 / 1689 K
品牌: SMSC [ SMSC CORPORATION ]
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USB 2.0 Hi-Speed Hub Controller  
Datasheet  
8.6.1.3  
RESET_N for SMBus Slave Configuration  
Start  
completion  
request  
response  
Hardware  
reset  
asserted  
Attach  
USB  
Upstream  
Reset  
Negation  
SMBus Code  
Load  
Hub PHY  
Stabilization  
USB Reset  
recovery  
Idle  
t6  
t7  
t1  
t5  
t2  
t3  
t4  
RESET_N  
VSS  
Figure 8.5 Reset_N Timing for SMBus Mode  
Table 8.9 Reset_N Timing for SMBus Mode  
NAME  
DESCRIPTION  
MIN  
TYP  
MAX  
UNITS  
t1  
t2  
t3  
t4  
t5  
RESET_N Asserted.  
1
μsec  
μsec  
msec  
msec  
msec  
Hub Recovery/Stabilization.  
SMBus Code Load (See Note).  
Hub Configuration and USB Attach.  
500  
300  
100  
250  
Host acknowledges attach and signals USB  
Reset.  
100  
t6  
t7  
USB Idle.  
Undefined  
msec  
msec  
Completion time for requests (with or without data  
stage).  
5
Notes:  
„
For bus-powered configurations, the 99.5 ms (MAX) is required, and the hub and its associated  
circuitry must not consume more than 100 mA from the upstream USB power source during  
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load  
the configuration is determined by the external SMBus host.  
„
All power supplies must have reached the operating levels mandated in Chapter 9, DC Parameters,  
prior to (or coincident with) the assertion of RESET_N.  
8.6.2  
USB Bus Reset  
In response to the upstream port signaling a reset to the hub, the hub does the following:  
Note: The hub does not propagate the upstream USB reset to downstream devices.  
1. Sets default address to 0.  
2. Sets configuration to: Unconfigured.  
3. Negates PRTPWR[x:1] to all downstream ports unless battery charging (BC_EN) is enabled.  
4. Clears all TT buffers.  
5. Moves device from suspended to active (if suspended).  
Revision 1.0 (3-11-09)  
58  
SMSC USB251x  
DATASHEET  
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