Hitachi 7K250 Specifications - Page 235

13.0 Time-out values The timing of BSY and DRQ in Status Register are shown in the table below. Table 141: Time-out values Power On Software Reset Hard Reset Data In Command Data Out Command Non-Data Command DMA Data Transfer Command INTERVAL START STOP Device Busy After Power On Power On Status Register BSY=1 Device Ready After Power On Power On Status Register BSY=1 and RDY=1 Device Busy After Soft- Device Control Regis- ware Reset ter RST=1 Status Register BSY=1 Device Ready After Software Reset Device Control Regis- Status Register BSY=0 ter RST=0 After RST=1 and RDY=1 Device Busy After Hard Bus RESET Signal Reset Asserted Status Register BSY=1 Device Ready After Hard Reset Bus RESET Signal Asserted Status Register BSY=0 and RDY=1 Device Busy After Com- OUT To Command mand Code Out Register Status Register BSY=1 Interrupt, DRQ For Data Status Register BSY=1 Status Register BSY=0 Transfer In and DRQ=1, Interrupt Device Busy After Data 256th Read From Data Status Register BSY=1 Transfer In Register Device Busy After Com- OUT to Command Reg- Status Register BSY=1 mand Code Out ister Device Busy After Data 256th Write From Data Status Register BSY=1 Transfer Out Register Interrupt For Data Transfer Out Status Register BSY=1 Status Register BSY=0 and RDY=1 Interrupt Device Busy After Com- OUT to Command Reg- Status Register BSY=1 mand Code Out ister Interrupt For Command Status Register BSY=1 Interrupt Complete Device Busy After Com- OUT to Command Reg- Status Register BSY=1 mand Code Out ister TIME-OUT 400 ns 31 sec 400 ns 31 sec 400 ns 31 sec 400 ns 30 sec 10 µs 400 ns 5 µs 30 sec 400 ns 30 sec 400 ns Command category is referred to in section 11.0, "Command protocol" on page 99. The abbreviations "ns", "µs", "ms," and "sec" mean nanoseconds, microseconds, milliseconds, and seconds, respectively. Deskstar 7K250 Hard Disk Drive Specification 221