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USB3813I-1080XY 参数 Datasheet PDF下载

USB3813I-1080XY图片预览
型号: USB3813I-1080XY
PDF下载: 下载PDF文件 查看货源
内容描述: USB 2.0高速3端口集线器控制器经过优化,用于便携式应用 [USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications]
分类和应用: 控制器便携式
文件页数/大小: 68 页 / 882 K
品牌: SMSC [ SMSC CORPORATION ]
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USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications  
Datasheet  
Chapter 7 Device Interfaces  
The USB3813 provides multiple interfaces for configuration and external memory access. This chapter  
details the various device interfaces and their usage.  
Note: For information on device configuration, refer to Chapter 6, "Device Configuration," on page 24.  
7.1  
SPI Interface  
The device is capable of code execution from an external SPI ROM. On power up, the firmware looks  
for an external SPI flash device that contains a valid signature of 2DFU (device firmware upgrade)  
beginning at address 0xFFFA. If a valid signature is found, then the external ROM is enabled and the  
code execution begins at address 0x0000 in the external SPI device. If a valid signature is not found,  
then execution continues from internal ROM. The following sections describe the interface options to  
the external SPI ROM.  
The SPI interface is always enabled after reset. It can be disabled by setting the SPI_DISABLE bit in  
the UTIL_CONFIG1 register.  
Note: For SPI timing information, refer to Section 9.5.7, "SPI Timing," on page 64.  
7.1.1  
Operation of the Hi-Speed Read Sequence  
The SPI controller will automatically handle code reads going out to the SPI ROM address. When the  
controller detects a read, the controller drives SPI_CE_N low, and outputs 0x0B, followed by the 24-  
bit address. The SPI controller outputs a DUMMY byte. The next eight clocks will clock-in the first byte.  
When the first byte is clocked-in, a ready signal is sent back to the processor, and the processor gets  
one byte.  
After the processor gets the first byte, its address will change. If the address is one more than the last  
address, the SPI controller will clock out one more byte. If the address is anything other than one more  
than the last address, the SPI controller will terminate the transaction by driving SPI_CE_N high. As  
long as the addresses are sequential, the SPI Controller will continue clocking data in.  
SPI_CE_N  
80  
55 56  
63 64  
71 72  
0
4
5
6
7 8  
15 16  
23 24  
31 32  
39 40  
47 48  
1
2
3
SPI_CLK  
SPI_DO  
X
ADD.  
ADD.  
ADD.  
0B  
MSB  
MSB  
N
N+1  
N+2  
N+3  
N+4  
HIGH IMPEDANCE  
DOUT  
DOUT  
DOUT  
DOUT  
DOUT  
SPI_DI  
MSB  
Figure 7.1 SPI Hi-Speed Read Sequence  
Revision 1.0 (06-17-13)  
28  
SMSC USB3813  
DATASHEET