FDC37M607 datasheet(53/182 Pages) SMSC

53 / 182 page

then the head settling time may be saved

between subsequent reads.

If the FDC detects a pulse on the nINDEX pin

twice

without

finding

the

specified

sector

(meaning that the diskette's index hole passes

through index detect logic in the drive twice), the

FDC sets the IC code in Status Register

0 to

"01"

indicating

abnormal termination, sets the

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

sector not found, and terminates the Read Data

Command.

After reading the ID and Data Fields in 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 23 describes the effect

of the SK bit on the Read Data command

execution and results. Except where noted in

Table 23, the C or R value of the sector address

is automatically incremented (see Table 25).

Table 22 - 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 23 - 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.

Sector not read

("skipped").

FDC37M607 Datasheet(PDF) 53 Page - SMSC Corporation

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