DP8496 datasheet(32/92 Pages) NSC

32 / 92 page

40 Functional Description (Continued)

Data Synch

1 Pattern (DSP1)

33h

76543210

Pattern

Pattern used for the Synch

1 field Can be used as an

Address Mark in soft sectored formats

Data Synch

2 Pattern (DSP2)

34h

76543210

Pattern

Pattern used for the Synch

2 field

Sector Byte CountLow (SBCL) 35h

76543210

Count

Sector Byte CountHigh (SBCH) 36h

76543210

Count

These two registers set the number of data bytes in a sec-

tor The range of the combined value for the Byte Count is

10h – FFFEh This must be an even number

Data Format Pattern (DFP)

37h

76543210

Pattern

Pattern used for the data field during a Format Type A or C

For Format Types B and C the data field will be transferred

from buffer memory

Data ECC and Postamble Count (DECC) 38h

76543210

CRCECC

Postamble Count

CRCECC

000 No CRCECC

010 16-Bit CRC

100 32-Bit ECC

110 48-Bit ECC

111 56-Bit ECC

Postamble Count

Number of bytes in the Data Postamble Range is 1 – 1F

Gap 3 Byte Count (GAPC)

39h

76543210

Count

Number of bytes in Gap 3 In hard sectored mode this

count must be programmed small enough to time-out before

the next Index or Sector pulse

During a soft-sectored Format operation Gap 3 functions

normally except after the last sector After the last sector

the Gap 3 pattern is repeated until the Index pulse is re-

ceived The Gap 3 Byte Count is ignored after the last sec-

tor

Gap 3 PatternPSIG (GAPP)

3Ah

76543210

Pattern

Pattern used in Gap 3 field and Post SectorIndex Gap field

DP8496 Datasheet(PDF) 32 Page - National Semiconductor (TI)

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