LPC47M182 datasheet(72/223 Pages) SMSC

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Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)

SMSC LPC47M182

DATASHEET

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 is 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.

6.19

Sense Interrupt Status

An interrupt signal is generated by the FDC for one of the following reasons:

1. Upon entering the Result Phase of:

Read Data command

Read A Track command

Read ID command

Read Deleted Data command

Write Data command

Format A Track command

Write Deleted Data command

Verify command

End of Seek, Relative Seek, or Recalibrate command

The Sense Interrupt Status command resets the interrupt signal and, via the IC code and SE bit of Status

Table 6.25 - Interrupt Identification

INTERRUPT DUE TO

Polling

Normal termination of Seek

or Recalibrate command

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 (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.

LPC47M182 Datasheet(PDF) 72 Page - SMSC Corporation

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