欢迎访问ic37.com |
会员登录 免费注册
发布采购

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 ]
 浏览型号USB2512B-AEZG的Datasheet PDF文件第20页浏览型号USB2512B-AEZG的Datasheet PDF文件第21页浏览型号USB2512B-AEZG的Datasheet PDF文件第22页浏览型号USB2512B-AEZG的Datasheet PDF文件第23页浏览型号USB2512B-AEZG的Datasheet PDF文件第25页浏览型号USB2512B-AEZG的Datasheet PDF文件第26页浏览型号USB2512B-AEZG的Datasheet PDF文件第27页浏览型号USB2512B-AEZG的Datasheet PDF文件第28页  
USB 2.0 Hi-Speed Hub Controller  
Datasheet  
Table 5.2 USB251x Pin Descriptions (continued)  
BUFFER  
SYMBOL  
TYPE  
DESCRIPTION  
DOWNSTREAM USB 2.0 INTERFACES (continued)  
LED_B_N[2:1] /  
I/O12  
Enhanced Indicator Port LED for ports 1 and 2  
Enhanced indicator LED for ports 1 and 2. This pin will be active low when  
LED support is enabled via EEPROM or SMBus.  
If this strap option is enabled by package and configuration settings (see  
Table 8.1, "Hub Configuration Options"), this pin will be sampled at RESET_N  
negation to determine if all PHY ports (upstream and downstream) operate at  
a normal or boosted electrical level. Also, the active state of the LEDs will be  
determined as follows:  
BOOST[1:0]  
See Section 8.2.1.27, "Register F6h: Boost_Up," on page 45 and Section  
8.2.1.29, "Register F8h: Boost_4:0," on page 47 for more information.  
BOOST[1:0] = BOOST_IOUT[1:0]  
BOOST[1:0] = ‘00’,  
LED_B_N[2] is active high,  
LED_B_N[1] is active high.  
BOOST[1:0] = ‘01’,  
LED_B_N[2] is active high,  
LED_B_N[1] is active low.  
BOOST[1:0] = ‘10’,  
LED_B_N[2] is active low,  
LED_B_N[1] is active high.  
BOOST[1:0] = ‘11’,  
LED_B_N[2] is active low,  
LED_B_N[1] is active low.  
PRTPWR_POL  
IPU  
Port Power Polarity Strapping  
Port Power Polarity strapping determination for the active signal polarity of  
the [x:1]PRTPWR pins.  
While RESET_N is asserted, the logic state of this pin will (through the use  
of internal combinatorial logic) determine the active state of the PRTPWR  
pins in order to ensure that downstream port power is not inadvertently  
enabled to inactive ports during a hardware reset.  
When RESET_N is negated, the logic value will be latched internally, and will  
retain the active signal polarity for the PRTPWR[x:1] pins.  
‘1’ = PRTPWR[x:1]_P/N pins have an active ‘high’ polarity  
‘0’ = PRTPWR[x:1]_P/N pins have an active ‘low’ polarity  
Warning: Active low port power controllers may glitch the downstream port  
power when the system power is first applied. Care should be taken when  
designing with active low components.  
When PRTPWR_POL is not an available pin on the package, the hub will only  
support active high power controllers.  
OCS_N[x:1]  
RBIAS  
IPU  
I-R  
Over-Current Sense  
Input from external current monitor indicating an over-current condition.  
USB Transceiver Bias  
A 12.0 kΩ (+/- 1%) resistor is attached from ground to this pin to set the  
transceiver’s internal bias settings.  
Revision 1.0 (3-11-09)  
24  
SMSC USB251x  
DATASHEET  
 复制成功!