IBM IC25N020ATDA04 Hard Drive Specifications - Page 211

Time-out values, DMA Data, Transfer, Command, Non-Data, Data Out, Data In, Hard Reset, Software

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14.0 Time-out values The timing of BSY and DRQ in Status Register are shown in the table below. INTERVAL Power On Software Reset Hard Reset Data In Command Data Out Command Non-Data Command DMA Data Transfer Command Device Busy After Power On Device Ready After Power On Device Busy After Software Reset Device Ready After Software Reset Device Busy After Hard Reset Device Ready After Hard Reset Device Busy After Command Code Out Interrupt, DRQ For Data Transfer In Device Busy After Data Transfer In Device Busy After Command Code Out Data Request For Data Transfer Out Device Busy After Data Transfer Out Interrupt For Data Transfer Out Device Busy After Command Code Out Interrupt For Command Complete Device Busy After Command Code Out Figure 136. Time-out values START Power On Power On Device Control Register RST=1 Device Control Register RST=0 After RST=1 Bus RESET Signal Asserted Bus RESET Signal Asserted OUT To Command Register Status Register BSY=1 256th Read From Data Register OUT to Command Register Status Register BSY=1 256th Write From Data Register Status Register BSY=1 OUT to Command Register Status Register BSY=1 OUT to Command Register STOP Status Register BSY=1 Status Register BSY=0 and RDY=1 Status Register BSY=1 Status Register BSY=0 and RDY=1 Status Register BSY=1 Status Register BSY=0 and RDY=1 Status Register BSY=1 Status Register BSY=0 and DRQ=1, Interrupt Status Register BSY=1 Status Register BSY=1 Status Register BSY=0 and DRQ=1 Status Register BSY=1 Status Register BSY=0 and RDY=1 Interrupt Status Register BSY=1 Interrupt Status Register BSY=1 TIME-OUT 400 ns 31 sec 400 ns 31 sec 400 ns 31 sec 400 ns 30 sec 10 us 400 ns 700 us (Note 3.) 5 us 30 sec (Note 1.) 400 ns 30 sec (Note 2.) 400 ns Command category is referred to in Section 12.0, "Command protocol" on page 103. We recommend that the host system execute Soft reset and then retry to issue the command if the host system time-out would occur for the device. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 197

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14.0 Time-out values
The timing of BSY and DRQ in Status Register are shown in the table below.
400 ns
Status Register
BSY=1
OUT to Command
Register
Device Busy
After Command
Code Out
DMA Data
Transfer
Command
30 sec
(Note 2.)
Interrupt
Status Register
BSY=1
Interrupt For
Command
Complete
400 ns
Status Register
BSY=1
OUT to Command
Register
Device Busy
After Command
Code Out
Non-Data
Command
30 sec
(Note 1.)
Status Register
BSY=0 and RDY=1
Interrupt
Status Register
BSY=1
Interrupt For
Data Transfer
Out
5 us
Status Register
BSY=1
256th Write
From Data
Register
Device Busy
After Data
Transfer Out
700 us
(Note 3.)
Status Register
BSY=0 and DRQ=1
Status Register
BSY=1
Data Request
For Data
Transfer Out
400 ns
Status Register
BSY=1
OUT to Command
Register
Device Busy
After Command
Code Out
Data Out
Command
10 us
Status Register
BSY=1
256th Read From
Data Register
Device Busy
After Data
Transfer In
30 sec
Status Register
BSY=0 and DRQ=1,
Interrupt
Status Register
BSY=1
Interrupt, DRQ
For Data
Transfer In
400 ns
Status Register
BSY=1
OUT To Command
Register
Device Busy
After Command
Code Out
Data In
Command
31 sec
Status Register
BSY=0 and RDY=1
Bus RESET
Signal Asserted
Device Ready
After Hard
Reset
400 ns
Status Register
BSY=1
Bus RESET
Signal Asserted
Device Busy
After Hard
Reset
Hard Reset
31 sec
Status Register
BSY=0 and RDY=1
Device Control
Register RST=0
After RST=1
Device Ready
After Software
Reset
400 ns
Status Register
BSY=1
Device Control
Register RST=1
Device Busy
After Software
Reset
Software
Reset
31 sec
Status Register
BSY=0 and RDY=1
Power On
Device Ready
After Power On
400 ns
Status Register
BSY=1
Power On
Device Busy
After Power On
Power On
TIME-OUT
STOP
START
INTERVAL
Figure 136. Time-out values
Command category is referred to in Section 12.0, "Command protocol" on page 103.
We recommend that the host system execute Soft reset and then retry to issue the command if the host
system time-out would occur for the device.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
197