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PM7367 数据表(PDF) 76 Page - PMC-Sierra, Inc |
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PM7367 数据表(HTML) 76 Page - PMC-Sierra, Inc |
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76 / 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 62 performance statistics on channels and not for initiating packet specific responses such as retransmission. Transmit Channel Descriptor Reference Table The TMAC maintains a Transmit Channel Descriptor Reference (TCDR) table in which is stored certain information relating to DMA activity on each channel together with TD pointers which are used by the TMAC to sort packet chains supplied by the host into per-channel linked lists (see below). The caching of DMA-related information reduces the number of host bus accesses required to process each data packet, while the sorting into per-channel linked lists eliminates head of line blocking. Each channel is provided with two entries in the TCDR table, one for high priority packets (Pri 1) and one for low priority packets (Pri 0). The structure of the TCDR table is shown in Figure 13 below. Figure 13 – Transmit Channel Descriptor Reference Table MCE Last TD Pointer AD Current TD Pointer Bytes to Tx [1 0] Abrt IOC Host TD Pointer [13 0] DMA Current Address [31 0] Reserved MCE Last TD Pointer [13 0] AD Current TD Pointer [13 0] Bytes to Tx [1 0] Abrt IOC Host TD Pointer [13 0] DMA Current Address [31 0] MCE Last TD Pointer AD Current TD Pointer Bytes to Tx [1 0] Abrt IOC Host TD Pointer [13 0] DMA Current Address [31 0] : : : Bit 31 Bit 0 TCC 0, Pri 0 TCC 1, Pri 0 TCC 31, Pri 1 Next TD Pointer [13 0] Reserved Next TD Pointer [13 0] Reserved Next TD Pointer [13 0] V V V Last M U NA Last M U NA Last M U NA PiP PiP PiP |
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