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AN2135SC 参数 Datasheet PDF下载

AN2135SC图片预览
型号: AN2135SC
PDF下载: 下载PDF文件 查看货源
内容描述: 在EZ - USBTM集成电路 [The EZ-USBTM Integrated Circuit]
分类和应用: 微控制器和处理器外围集成电路时钟
文件页数/大小: 334 页 / 1468 K
品牌: CYPRESS [ CYPRESS ]
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USBPAIR  
USB Endpoint Pairing  
7FDD  
b7  
b6  
b5  
b4  
b3  
b2  
b1  
b0  
ISOSEND0  
-
PR6OUT  
PR4OUT  
PR2OUT  
PR6IN  
PR4IN  
PR2IN  
R/W  
0
R/W  
x
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
R/W  
0
Figure 12-35. USB Endpoint Pairing Register  
Bit 7:  
ISOSEND0 Isochronous Send Zero Length Data Packet  
The ISOSEND0 bit is used when the EZ-USB chip receives an isochronous IN token  
while the IN FIFO is empty. If ISOSEND0=0 (the default value), the EZ-USB core does  
not respond to the IN token. If ISOSEND0=1, the EZ-USB core sends a zero-length data  
packet in response to the IN token. Which action to take depends on the overall system  
design. The ISOSEND0 bit applies to all of the isochronous IN endpoints, IN8BUF  
through IN15BUF.  
Bit 5-3:  
PRnOUT  
Pair Bulk OUT Endpoints  
Set the endpoint pairing bits (PRxOUT) to “1” to enable double-buffering of the bulk  
OUT endpoint buffers. With double buffering enabled, the 8051 can operate on one buffer  
while another is being transferred over USB. The endpoint busy and interrupt request bits  
function identically, so the 8051 code requires no code modification to support double  
buffering.  
When an endpoint is paired, the 8051 uses only the even-numbered endpoint of the pair.  
The 8051 should not use the paired odd endpoint’s IRQ, IEN, VALID bits or the buffer  
associated with the odd numbered endpoint.  
Bit 2-0:  
PRnIN  
Pair Bulk IN Endpoints  
Set the endpoint pairing bits (PRxIN) to “1” to enable double-buffering of the bulk IN  
endpoint buffers. With double buffering enabled, the 8051 can operate on one buffer  
while another is being transferred over USB.  
When an endpoint is paired, the 8051 should access only the even-numbered endpoint of  
the pair. The 8051 should not use the IRQ, IEN, VALID bits or the buffer associated with  
the odd numbered endpoint.  
EZ-USB TRM v1.9  
Chapter 12. EZ-USB Registers  
Page 12-43  
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