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PM7367 数据表(PDF) 59 Page - PMC-Sierra, Inc |
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PM7367 数据表(HTML) 59 Page - PMC-Sierra, Inc |
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59 / 323 page ![]() PM7367 FREEDM-32P32 DATA SHEET PMC-1991499 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE 45 Figure 8 – Receive Channel Descriptor Reference Table RPD Pointer[13:0] Bytes Available in Buffer[15:0] Start RPD Pointer[13:0] DMA Current Address[31:0] RBC[1:0] Bit 0 Bit 31 RCC 0 RCC 1 RCC 31 RPD Pointer[13:0] Bytes Available in Buffer[15:0] Start RPD Pointer[13:0] DMA Current Address[31:0] RPD Pointer[13:0] Bytes Available in Buffer[15:0] Start RPD Pointer[13:0] DMA Current Address[31:0] RBC[1:0] RBC[1:0] Buffer Size[15:0] Buffer Size[15:0] Buffer Size[15:0] V V V Res Res Res Table 8 – Receive Channel Descriptor Reference Table Fields Field Description Bytes Available in Buffer[15:0] This field is used to keep track of the number of bytes available in the current data buffer. The RMAC initialises the Bytes Available in Buffer to the Receive Buffer Size minus the offset at the head of the buffer. The field is decremented each time a byte is written into the buffer. RBC[1:0] This field is used to keep track of the number of buffers used when storing ‘raw’ (i.e. non packet delimited) data. The RMAC initialises the RBC field to the value of the RAWMAX[1:0] field in the RMAC Control Register. The field is decremented each time a buffer is filled with data. If the field reaches zero, the chain of RPDs is placed on the ready queue and a new chain started. RPD Pointer[13:0] This field contains the pointer to the current RPD. Buffer Size[15:0] This field contains the size in bytes of the buffer currently being written to. |
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