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SAB82525H-V21 参数 Datasheet PDF下载

SAB82525H-V21图片预览
型号: SAB82525H-V21
PDF下载: 下载PDF文件 查看货源
内容描述: 高层次的串行通信控制器扩展 [High-Level Serial Communication Controller Extended]
分类和应用: 通信控制器
文件页数/大小: 126 页 / 741 K
品牌: SIEMENS [ Siemens Semiconductor Group ]
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SAB 82525  
SAB 82526  
SAF 82525  
SAF 82526  
If frames longer than 64 bytes are received, the device will repeatedly prompt to read out 32-  
byte data blocks via interrupt or DMA.  
In the case of several shorter frames, up to 17 may be stored in the HSCX.  
If the accessible half of the RFIFO contains a frame i (or the last part of frame i), up to 16 short  
frames may be stored in the other half (i + 1,. . ., i + n) meanwhile, prior to frame i being fetched  
from the RFIFO.  
This is illustrated in figure 22.  
For a description of a transmit and receive sequence in both Interrupt or DMA Mode, please  
refer to chapter 7.2 and 7.3.  
Frame i + n  
Frame i + n  
Frame i + 2  
32 Bytes  
Inaccessible  
_
<
0 < n 16  
Frame i + 1  
32 Bytes  
Accessible  
Last Part  
of Frame i  
Frame i + 1  
a) Prior to  
Acknowledgement  
b) After  
Acknowledgement  
ITD00486  
Figure 22  
Configuration of RFIFO (Short Frames)  
Note: The number of 17 frames applies e.g. for the HSCX operating in the auto or non-auto  
mode (address recognition), and short frames only containing the HDLC Address and  
Control field are received. Since the address is not stored, the control field is always  
stored first in the RFIFO, and an additional status byte is always appended at the end  
of each frame in the RFIFO, these frames will occupy two bytes.  
Semiconductor Group  
48  
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