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PM7366-PI датащи(PDF) 168 Page - PMC-Sierra, Inc |
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PM7366-PI датащи(HTML) 168 Page - PMC-Sierra, Inc |
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168 / 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 155 CACHE: The transmit descriptor reference cache enable bit (CACHE) controls the frequency at which TDRs are written to the TDR Free Queue. When CACHE is set high, freed TDRs are cache and then written up to six at a time. When CACHE is set low, freed TDRs are written one at a time. TDQ_RDYN[2:0]: The TDQ_RDYN[2:0] field sets the number of transmit descriptor references (TDRs) that must be read from the TDR Ready Queue before the TDR Ready interrupt (TDQRDYI) is asserted, as follows: Table 22 – TDQ_RDYN[2:0] Settings TDQ_RDYN[2:0] No of TDRs 000 1 001 4 010 6 011 8 100 16 101 32 110 Reserved 111 Reserved TDQ_FRN[1:0]: The TDQ_FRN[1:0] field sets the number of times that a block of TDRs are written to the TDR Free Queue from the TMACs internal cache before the TDR Free Queue Interrupt (TDQFI) is asserted, as follows: Table 23 – TDQ_FRN[1:0] Settings TDQ_FRN[1:0] No of Reads 00 1 01 4 10 8 11 Reserved |
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