FDC37C669-MT datasheet(57/162 Pages) MICROCHIP

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the ND bit in Status Register 1 to "1" indicating a sector

not found, and terminates the Read Data Command.

After

reading

the

and

Data

Fields

each

sector, the FDC checks the CRC bytes. If a CRC error

occurs in the ID or data field, the FDC sets the IC code in

Status Register 0 to "01" indicating abnormal termination,

sets the DE bit flag in Status Register 1 to "1", sets the

DD bit in Status Register 2 to "1" if CRC is incorrect in the

ID field, and terminates the Read Data Command. Table

22 describes the effect of the SK bit on the Read Data

command execution and results. Except where noted in

Table 22, the C or R value of the sector address is

automatically incremented (see Table 24).

Table 21 - Effects of MT and N Bits

MAXIMUM TRANSFER

CAPACITY

FINAL SECTOR READ

FROM DISK

256 x 26 = 6,656

256 x 52 = 13,312

512 x 15 = 7,680

512 x 30 = 15,360

1024 x 8 = 8,192

1024 x 16 = 16,384

26 at side 0 or 1

26 at side 1

15 at side 0 or 1

15 at side 1

8 at side 0 or 1

16 at side 1

Table 22 - Skip Bit vs Read Data Command

SK BIT

VALUE

DATA ADDRESS

MARK TYPE

ENCOUNTERED

RESULTS

SECTOR

READ?

CM BIT OF

ST2 SET?

DESCRIPTION OF

RESULTS

Normal Data

Deleted Data

Normal Data

Deleted Data

Yes

Normal

termination.

Address not

incremented. Next

sector not

searched for.

Normal

termination.

Normal

termination. Sector

not read

("skipped").

FDC37C669-MT Datasheet(PDF) 57 Page - Microchip Technology

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