DP8496 datasheet(38/92 Pages) NSC

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40 Functional Description (Continued)

RGATE during Header Segment

(Hard and Pseudo-Hard Sectored)

TLF11212 – 16

RGATE during Header Segment (Soft Sectored)

TLF11212 – 17

WGATE during Header Segment (Hard Sectored)

TLF11212 – 18

WGATE during Header Segment

(Soft and Pseudo-Hard Sectored)

TLF11212 – 19

Note 1

While searching for the Header Preamble RGATE will transition from asserted to deasserted following the algorithm shown in

Figure 48

Note 2

RGATE will become deasserted one byte time after the end of CRCECC field

Note

PSIG field for soft sectored drives only appears before the first sector For other sectors PSIG will have a field length of one byte

FIGURE 49 RGATE and WGATE Timing during Header Segment

RGATE during Data Segment

(Hard and Pseudo-Hard Sectored)

TLF11212 – 20

RGATE during Data Segment (Soft Sectored)

TLF11212 – 21

WGATE during Data Segment (Hard Sectored)

TLF11212 – 22

WGATE during Data Segment

(Soft and Pseudo-Hard Sectored)

TLF11212 – 23

Note 1

RGATE will become deasserted one byte time after the end of CRCECC field Also if an additional sector is to be read RGATE will become re-asserted

after a Header Gap time plus two bytes after this point

FIGURE 410 RGATE and WGATE Timing during Data Segment

DP8496 Datasheet(PDF) 38 Page - National Semiconductor (TI)