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PM7366-PI bảng dữ liệu(PDF) 71 Page - PMC-Sierra, Inc

tên linh kiện PM7366-PI
Giải thích chi tiết về linh kiện  FRAME ENGINE AND DATA LINK MANAGER
PDF  286 Pages
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nhà sản xuất  PMC [PMC-Sierra, Inc]
Trang chủ  http://www.pmc-sierra.com
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PM7366-PI bảng dữ liệu(HTML) 71 Page - PMC-Sierra, Inc

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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
58
Figure 11 – Transmit Descriptor Table
TDTB[31:4] = Tx Descriptor Table Base register
TDR[13:0] = Transmit Descriptor Reference
TD_ADDR[31:0] = Transmit Descriptor Address
TDTB
Bit 0
Bit 31
TD_ADDR
TD1
TD2
TD 16384
Dword 0
Dword 1
Dword 2
Dword 3
TDTB[31:4]
TDR[13:0]
Bit 31
Bit 0
+
=
TD_ADDR[31:0]
Dword 0
Dword 0
0000
0000
Dword 3
Dword 3
Transmit Queues
Pointers to the transmit descriptors (TDs) containing packet(s) ready for transmission are passed
from the host to the TMAC using the Transmit Descriptor Reference Ready (TDRR) queue, which
resides in host memory. Pointers to transmit descriptor structures whose buffers have been read
by the TMAC are passed from the TMAC to the host using the Transmit Descriptor Reference
Free (TDRF) queue, which also resides in host memory. The TMAC contains a Free Queue
cache which can store up to six TDRs. If caching is enabled, free TDRs are written into the TDRF
queue six at a time, to reduce the number of host memory accesses. The Free Queue cache is



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