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PM7366-PI データシート(PDF) 75 Page - PMC-Sierra, Inc |
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PM7366-PI データシート(HTML) 75 Page - PMC-Sierra, Inc |
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75 / 286 page  RELEASED PM7366 FREEDM-8 DATA SHEET PMC-1970930 ISSUE 4 FRAME ENGINE AND DATA LINK MANAGER PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 62 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 M CE Last TD Pointer [13:0] A D Current TD Pointer [13:0] Bytes to Tx [15:0] Abrt IOC Host TD Pointer [13:0] DMA Current Address [31:0] Reserved M CE Last TD Pointer [13:0] A D Current TD Pointer [13:0] Bytes to Tx [15:0] Abrt IOC Host TD Pointer [13:0] DMA Current Address [31:0] M CE Last TD Pointer [13:0] A D Current TD Pointer [13:0] Bytes to Tx [15:0] 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 127, 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 Table 13 – Transmit Channel Descriptor Reference Table Fields Field Description M A copy of the M bit in the TD currently being read. CE A copy of the CE bit in the TD currently being read. Last TD Pointer [13:0] Offset to the head of the last host-linked chain of TDs to be read. (See Figure 14) |
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