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DP83266 데이터시트(PDF) 113 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP83266
상세설명  MACSITM Device (FDDI Media Access Controller and System Interface)
PDF  152 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83266 데이터시트(HTML) 113 Page - National Semiconductor (TI)

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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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