phase it is in a NON-BUSY state. At this time, another Recalibrate command may be issued, and in this manner
parallel Recalibrate operations may be done on up to four drives at once.
Upon power up, the software must issue a Recalibrate command to properly initialize all drives and the controller.
SEEK
The read/write head within the drive is moved from track to track under the control of the Seek command. The FDC
compares the PCN, which is the current head position, with the NCN and performs the following operation if there is a
difference:
PCN < NCN: Direction signal to drive set to “1” (step in) and issues step pulses.
PCN > NCN: Direction signal to drive set to “0” (step out) and issues step pulses.
The rate at which step pulses are issued is controlled by SRT (Stepping Rate Time) in the Specify command. After
each step pulse is issued, NCN is compared against PCN, and when NCN = PCN the SE bit in Status Register 0 is
set to “1” and the command is terminated.
During the command phase of the seek or recalibrate operation, the FDC is in the BUSY state, but during the
execution phase it is in the NON-BUSY state. At this time, another Seek or Recalibrate command may be issued,
and in 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, it is 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
f) 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 42 - Interrupt Identification
SE
0
1
IC
11
00
INTERRUPT DUE TO
Polling
Normal termination of Seek
or Recalibrate command
1
01
Abnormal termination of Seek
or Recalibrate command
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
SMSC DS – FDC37N3869
Page 50
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
