FDC37M607 datasheet(60/182 Pages) SMSC

60 / 182 page

this manner, parallel seek operations may be

done on up to four drives at once.

Note that if implied seek is not enabled, the read

and write commands should be preceded by:

1) Seek command - Step to the proper track

2) Sense

Interrupt

Status

command

Terminate the Seek command

3) Read ID - Verify head is on proper track

4) Issue Read/Write command.

The Seek command does not have a result

phase. Therefore, it is highly recommended that

the Sense Interrupt Status command be issued

after the Seek command to terminate it and to

provide verification of the head position (PCN).

The H bit (Head Address) in ST0 will always

return to a "0".

When exiting POWERDOWN

mode, the FDC clears the PCN value and the

status information to zero. Prior to issuing the

POWERDOWN

command,

highly

recommended that the user service all pending

interrupts through the Sense Interrupt Status

command.

Sense Interrupt Status

An interrupt signal on FINT pin is generated by

the FDC for one of the following reasons:

1. Upon entering the Result Phase of:

a. Read Data command

b. Read A Track command

c. Read ID command

d. Read Deleted Data command

e. Write Data command

Format A Track command

g. Write Deleted Data command

h. Verify command

2. End of Seek, Relative Seek, or Recalibrate

command

3. FDC requires a data transfer during the

execution phase in the non-DMA mode

The Sense Interrupt Status command resets the

interrupt signal and, via the IC code and SE bit

of Status Register 0, identifies the cause of the

interrupt.

Table 28 - Interrupt Identification

The Seek, Relative Seek, and Recalibrate

commands have no result phase.

The Sense

Interrupt Status command must be issued

immediately after these commands to terminate

them and to provide verification of the head

position (PCN).

The H (Head Address) bit in

ST0 will always return a "0". If a Sense Interrupt

Status is not issued, the drive will continue to be

BUSY and may affect the operation of the next

command.

Sense Drive Status

Sense

Drive

Status

obtains

drive

status

information.

It has not execution phase and

goes directly to the result phase from the

command phase.

Status Register 3 contains

the drive status information.

Specify

The Specify command sets the initial values for

each of the three internal times.

The HUT

(Head Unload Time) defines the time from the

end of the execution phase of one of the

read/write commands to the head unload state.

The SRT (Step Rate Time) defines the time

interval between adjacent step pulses. Note that

the spacing between the first and second step

pulses may be shorter than the remaining step

INTERRUPT DUE TO

Polling

Normal termination of Seek

or Recalibrate command

Abnormal termination of

Seek or Recalibrate

command

FDC37M607 Datasheet(PDF) 60 Page - SMSC Corporation

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