| 摘要 |
PURPOSE:To improve the utilizing efficiency of a buffer memory by giving plural buffer address stacks with different buffer length to a buffer management section and providing a frame length in response to a line attribute and reception frame type to a line control section to apply a buffer acquisition request to the buffer management section. CONSTITUTION:A buffer length L in response to the line attribute and the frame type is given to the line control section at frame reception, which applies a buffer acquisition request to the buffer management section. The buffer management section gives a top buffer address among buffer address stacks having a buffer minimum length being L or over to the line control section. The said buffer address is shown in 8 in figure. The line control section writes the reception frame on a buffer area of a buffer memory represented by the said buffer address. In case of I frame reception, the line control section 3 uses the maximum frame length of the line and in case of the reception other than the frame I, the section 3 uses two bytes as a buffer length to give a buffer acquisition request. |
