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DP83266 Datasheet(PDF) 113 Page - National Semiconductor (TI) |
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DP83266 Datasheet(HTML) 113 Page - National Semiconductor (TI) |
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113 / 152 page  70 Control Information (Continued) Indicate Header Length Register (IHLR) The Indicate Header Length Register (IHLR) defines the length (in words) of the frame header for use with the HeaderInfo Sort Mode The Indicate Header Length Register must be initialized before setting the Sort Mode in HeaderInfo This register may be changed while the INSTOP bit in the State Attention Register or the EXC bit in the Indicate Attention Register is set This register is not altered upon reset Access Rules Address Read Write 119h Always INSTOP Mode or EXC e 1 Only Register Bits D7 D6 D5 D4 D3 D2 D1 D0 HL7 HL6 HL5 HL4 HL3 HL2 HL1 HL0 Bit Symbol Description D7–D0 HL7–0 Header Length Specifies the length (in words) of the frame header for use with the HeaderInfo Sort Mode The frame FC is written as a separate word and thus counts as one word For example to split after eight bytes of FDDI INFO in a frame with long addresses this register is programmed with the value 06 (1 word FC 15 DA 15 SA 2HDR DATA) IHLR must not be loaded with a value less than 4 If it is the MACSI device sets the Command Error (CMDE) and Indicate Stop (INSTOP) attentions This Register only affects the HeaderInfo sort mode 113 |
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