 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
IT8673F Datasheet(PDF) 66 Page - List of Unclassifed Manufacturers |
|
||||||||||||||||||||||||||||||
IT8673F Datasheet(HTML) 66 Page - List of Unclassifed Manufacturers |
|
|
66 / 128 page  IT8673F 56 11.4.10 Command Set The FDC utilizes a defined set of commands to communicate with the host. Each command is comprised of a unique first byte, which contains the op-code, and a series of additional bytes, which contain the required set of parameters and results. The op-code byte indicates to the FDC how many additional bytes should be expected for the command being written. The descriptions use a common set of parameter byte symbols, which are presented in Table 11-14. The FDC commands may be executed whenever the FDC is in the Command phase. The FDC checks to see that the first byte is a valid command and, if so, proceeds. An interrupt is issued if it is not a valid command. Table 11-14. Command Set Symbol Descriptions Symbol Name Description C Cylinder Number The current/selected cylinder (track) number: 0 − 255. D Data The data pattern to be written into a sector. DC3 −DC0 Drive Configuration Bit3-0 Designate which drives are perpendicular drives on the PERPENDICULAR MODE command. DIR Direction Control Read/Write Head Step Direction Control. 0 = Step Out; 1 = Step In. DR0, DR1 Disk Drive Select The selected drive number: 0 or 1. DTL Data Length When N is defined as 00h, DTL designates the number of data bytes which users are going to read out or write into the Sector. When N is not 00h, DTL is undefined. DFIFO Disable FIFO A “1” will disable the FIFO (default). A “0” will enable the FIFO. EC Enable Count If EC=1, DTL of VERIFY command will be SC. EIS Enable Implied Seek If EIS=1, a SEEK operation will be performed before executing any READ or WRITE command that requires the C parameter. EOT End of Track The final sector number on a cylinder. During a READ or WRITE operation, the FDC stops data transfer after the sector number is equal to EOT. GAP2 Gap 2 Length By PERPENDICULAR MODE command, this parameter changes Gap 2 length in the format. GPL Gap Length The length of Gap 3. During a FORMAT command, it determines the size of Gap 3. H Head Address The Head number 0 or 1, as specified in the sector ID field. (H = HD in all command words.) HD Head The selected Head number 0 or 1. Also controls the polarity of HDSEL#. (H = HD in all command words.) HLT Head Load Time The Head Load Time in the FDD (2 to 254 ms in 2 ms increments). HUT Head Unload Time The Head Unload Time after a READ or WRITE operation has been executed (16 to 240 ms in 16 ms increments). LOCK If LOCK=1, DFIFO, FIFOTHR, and PRETRK parameters of the CONFIGURE command will not be affected by a software reset. If LOCK=0 (default), the above parameters will be set to their default values following a software reset. |
Similar Part No. - IT8673F |
|
Similar Description - IT8673F |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
