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PC8477BVF-1 Datasheet(PDF) 25 Page - National Semiconductor (TI) |
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PC8477BVF-1 Datasheet(HTML) 25 Page - National Semiconductor (TI) |
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25 / 54 page  40 Command Set Description (Continued) Once the desired sector Address Field is found the control- ler waits for the Data Separator to find the subsequent Data Field for that sector If the Data Field (normal or deleted) is not found with the expected time the controller terminates the operation and enters the Result Phase (MD is set in ST2) If a Deleted Data Mark is found and SK was set in the Opcode command byte the controller skips this sector and searches for the next sector Address Field as described above The effect of SK on the Read Data command is summarized in Table 4-6 Having found the Data Field the controller then transfers data bytes from the disk drive to the host (described in Sec- tion 53 Controller Phases) until the bytes per sector count has been reached or the host terminates the operation (through TC end of track or implicitly through overrun) The controller will then generate the CRC for the sector and compare this value with the CRC at the end of the Data Field Having finished reading the sector the controller will contin- ue reading the next logical sector unless one or more of the following termination conditions occurred 1 The DMA controller asserted TC The IC bits in ST0 are set to Normal Termination 2 The last sector address (of side 1 if MT was set) was equal to EOT The EOT bit in ST1 is set The IC bits in ST0 are set to Abnormal Termination This is the expect- ed condition during Non-DMA transfers 3 Overrun error The OR bit in ST1 is set The IC bits in ST0 are set to Abnormal Termination If the mP cannot service a transfer request in time the last correctly read byte will be transferred 4 CRC error The CE bit in ST1 and CD bit in ST2 are set The IC bits in ST0 are set to Abnormal Termination If MT was set in the Opcode command byte and the last sector of side 0 has been transferred the controller will then continue with side 1 starting with sector 1 and continuing until EOT sector number is reached or TC occurs Upon terminating the Execution Phase of the Read Data command the controller will assert INT indicating the be- ginning of the Result Phase The mP must then read the result bytes from the FIFO The values that will be read back in the result bytes are shown in Table 4-7 If an error occurs the result bytes will indicate the sector read when the error occurred 4210 Read Deleted Data Command The Read Deleted Data command reads logical sectors containing a Deleted Data AM from the selected drive and makes the data available to the host mP This command is identical to the Read Data command except for the setting of the CM bit in ST2 and the skipping of sectors The effect of SK on the Read Deleted Data command is summarized in Table 4-8 See Table 4-7 for the state of the result bytes for a Normal Termination of the command TABLE 4-6 SK Effect on Read Data Command SK Data Type Sector Read CM Bit (ST2) Description of Results 0 Normal Y 0 Normal Termination 0 Deleted Y 1 No Further Sectors Read 1 Normal Y 0 Normal Termination 1 Deleted N 1 Sector Skipped TABLE 4-7 Result Phase Termination Values with No Error MT HD Last Sector ID Information at Result Phase Track Head Sector BytesSector 00 k EOT NC NC S a 1NC 00 e EOT T a 1NC 1 NC 01 k EOT NC NC S a 1NC 01 e EOT T a 1NC 1 NC 10 k EOT NC H S a 1NC 10 e EOT T a 10 1 NC 11 k EOT NC H S a 1NC 11 e EOT T a 10 1 NC EOT e End of Track Sector Number from Command Phase NC e No Change in Value S e Sector Number last operated on by controller T e Track Number programmed in Command Phase H e Head last selected by controller TABLE 4-8 SK Effect on Read Deleted Data Command SK Data Type Sector Read CM Bit (ST2) Description of Results 0 Normal Y 1 No Further Sectors Read 0 Deleted Y 0 Normal Termination 1 Normal N 1 Sector Skipped 1 Deleted Y 0 Normal Termination 25 |
Similar Part No. - PC8477BVF-1 |
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Similar Description - PC8477BVF-1 |
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