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HB288128A6 Datasheet(PDF) 38 Page - Hitachi Semiconductor |
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HB288128A6 Datasheet(HTML) 38 Page - Hitachi Semiconductor |
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38 / 66 page  HB2881000/800/640/448/320/256/192/160/128/096/064/032A6 38 9. Status register: This register is read only register, and it indicates the card status of command execution. When this register is read in configured I/O card mode (INDEX = 1, 2, 3) and level interrupt mode, -IREQ is negated. This register should be accessed in byte mode. In word mode, it is recommended that Alternate status register may be used as this register. bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 BSY DRDY DWF DSC DRQ CORR IDX ERR bit Name Function 7 BSY (BuSY) This bit is set when the card internal operation is executing. When this bit is set to "1", other bits in this register are invalid. 6 DRDY (Drive ReaDY) If this bit and DSC bit are set to "1", the card is capable of receiving the read or write or seek requests. If this bit is set to "0", the card prohibits these requests. 5 DWF (Drive Write Fault) This bit is set if this card indicates the write fault status. 4 DSC (Drive Seek Complete) This bit is set when the drive seek complete. 3 DRQ (Data ReQuest) This bit is set when the information can be transferred between the host and Data register. This bit is cleared when the card receives the other command. 2 CORR (CORRected data) This bit is set when a correctable data error has been occurred and the data has been corrected. 1 IDX (InDeX) This bit is always set to "0". 0 ERR (ERRor) This bit is set when the previous command has ended in some type of error. The error information is set in the other Status register or Error register. This bit is cleared by the next command. 10. Alternate status register: This register is the same as Status register in physically, so the bit assignment refers to previous item of Status register. But this register is different from Status register that -IREQ is not negated when data read. 11. Command register: This register is write only register, and it is used for writing the command at executing the drive operation. The command code written in the command register, after the parameter is written in the Task File during the card is Ready state. |
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