DP83266 datasheet(113/152 Pages) NSC

tên linh kiện	DP83266

Giải thích chi tiết về linh kiện	MACSITM Device (FDDI Media Access Controller and System Interface)

PDF	152 Pages

Scroll/Zoom	100%

nhà sản xuất	NSC [National Semiconductor (TI)]

Trang chủ	http://www.national.com

Logo

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

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

DP83266 bảng dữ liệu(PDF) 113 Page - National Semiconductor (TI)