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PM7367 数据表(PDF) 75 Page - PMC-Sierra, Inc |
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PM7367 数据表(HTML) 75 Page - PMC-Sierra, Inc |
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75 / 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 61 Table 10 – Transmit Descriptor Reference Bit 16 Bit 0 STATUS[2:0] TDR[13:0] Field Description Status[2:0] The TMAC fills in the Status field to indicate to the host the results of processing the TD. The encoding is: Status[1:0] Description 00 Last or only buffer of packet, buffer read. 01 Buffer of partial packet, buffer read. 10 Unprovisioned channel, buffer not read. 11 Malformed packet (e.g. Bytes In Buffer field set to 0), buffer not read. Status[2] Description 0 No underflow detected. 1 Underflow detected. TDR[13:0] The TDR[13:0] field contains the offset of the TD returned. If a TDR is returned to the host with the status field set to “10” (unprovisioned channel), the TDR may point to a binary tree of TDs and buffers (as indicated by the CE and V bits in the TDs). It is the responsibility of the host to traverse the tree to reclaim all the buffers. If a TDR is returned to the host with the status field set to any other value, the TDR will only point to one TD and buffer regardless of the values of V and CE in that TD. The underflow status bit (Status[2]) is normally attached to the TDR belonging to a packet experiencing underflow. For long packets spanning multiple buffers, underflow is reported only once at the first available TDR of that channel. All subsequent TDRs of that packet will be returned normally without the underflow status. In rare cases, due to internal buffering by the FREEDM-32, a packet may experience underflow at the very end of a packet, just as the TDR is being returned to the TDR free queue. The underflow status will then be reported in the first TDR of the immediate next packet of that channel. Because of the uncertainty with the reporting of underflows between the current verse the subsequent packet, the underflow status should only be used to gather |
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