IBM DTTA-351010 Hard Drive Specifications - Page 83
Sector Addressing Mode
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the BSY bit whenever it is ready to accept commands. Device 0 may assert DASPto indicate device activity. Hard Reset, Soft Reset If Device 1 is present Device 0 shall read PDIAG- to determine when it is valid to clear the BSY bit and whether Device 1 has reset without any errors, otherwise Device 0 shall simply reset and clear the BSY bit. DASP- is asserted by Device 0 (and Device 1 if it is present) in order to indicate device active. Execute Device Diagnostic If Device 1 is present, Device 0 shall read PDIAG- to determine when it is valid to clear the BSY bit and if Device 1 passed or failed the EXECUTE DEVICE DIAGNOSTIC command, otherwise Device 0 shall simply execute its diagnostics and then clear the BSY bit. DASP- is asserted by Device 0 (and Device 1 if it is present) in order to indicate the device is active. In all the above cases: Power on, RESET-, Soft reset, and the EXECUTE DEVICE DIAGNOSTIC command the Device 0 Error register is shown in Figure 65. Device 1 Present? PDIAG Asserted? Device 0 Passed Error Register Yes Yes Yes 01h Yes Yes No 0xh Yes No Yes 81h Yes No No 8xh No (not read) Yes 01h No (not read) No 0xh Where x indicates the appropriate Diagnostic Code for the Power on, RESET-, Soft reset, or Device Diagnostic error. Figure 65. Reset error register values 10.3 Sector Addressing Mode All addressing of data sectors recorded on the device's media is by a logical sector address. The logical CHS address for DTTA-3xxxxx is different from the actual physical CHS location of the data sector on the disk media. DTTA-3xxxxx support both Logical CHS Addressing Mode and LBA Addressing Mode as the sector addressing mode. The host system may select either the currently selected CHS translation addressing or LBA addressing on a command-by-command basis by using the L bit in the DEVICE/HEAD register. So a host system must set the L bit to 1 if the host uses LBA Addressing mode. General Operation Descriptions 75