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--- himd_device_control [2010/05/21 15:39] – created megadiscman
+++ himd_device_control [2010/06/27 10:20] (current) – Fix time bit numbers megadiscman
@@ Line 1: / Line 1: @@
 ====== HiMD device control command (0xC2) ======
+The device control command is 12 bytes (0x0C), and depending on subcommand, intiates a data transfer from or to the device. The layout of the command block is
+  Byte 00: Command (0xC2)
+  Byte 01: Unknown, sent as zero (maybe LUN?)
+  Byte 02: For some subcommands: Application ID (0 == General?, 1 == MD Audio?, 2 == UMD Audio?)
+  Byte 03: subcommand
+  Byte 04: For some subcommands: Flag bits
+  Byte 05: For the switch interface command: Delay
+  Byte 06: unused, sent as zero
+  Byte 07: Set explicitly to zero for Get Leaf ID - Some Index?
+  Byte 08: Byte count of data transfer
+  Bytes 09-0B: unused
 === Subcommand 00: Erase HiMD ===
+  * Application ID: 0
+  * Used fields: flags.
+    * Bit 0: IMMED ("immediate": finish SCSI handling before command finishes - must be set on RH-1)
+    * Bit 1: FUA ("force unit access": write now, don't cache)
+This command completely blanks the medium. This is not possible with Hi-MD 1GB media, as the Disc ID is read-only. Standard MD media completely blanked are usable in standard MD devices. This is the only way getting rid of Hi-MD format on a standard MD medium.
 === Subcommand 01: Format HiMD ===
+  * Application ID: 0
+  * Used fields: flags.
+    * Bit 0: IMMED ("immediate": finish SCSI handling before command finishes - must be set on RH-1)
+    * Bit 1: FUA ("force unit access": write now, don't cache)
+    * Bit 2: NOFS (Don't generate FAT FS? - must be cleared on RH-1)
+This command just reinitializes the Hi-MD data structures on the Medium, but it doesn't remove the Hi-MD layout from it. It generally keeps the Disc ID, as this data is stored *outside* of the area accessible using normal read/write instructions, and only this area is reinitialized.
 === Subcommand 0E: Begin ICV Transaction ===
+  * Application ID: 0
+  * Used fields: none
+If the command is correctly understood, it starts a transaction that updates FAT, directory and the master ICV all at the same time, or none at all. See [[HiMDDownload]], at timestampe 84.6. The transaction is committed by the new ICV at timestamp 93.2
 === Subcommand 0F: Recommend Synchronize Cache ===
+  * Application ID: 0
+  * Used fields: none
 === Subcommand 10: Switch Interface ===
 === Subcommand 11: Get Leaf ID ===
 === Subcommand 20: Load Audio TOC ===
+  * Application ID: 1 or 2
+  * Used fields: none
 === Subcommand 21: Pause Audio ===
+  * Application ID: 1 or 2
+  * Used fields: none
 === Subcommand 22: Play Audio ===
+  * Application ID: 1 or 2
+  * Used fields: none
 === Subcommand 23: Scan Audio ===
+  * Application ID: 1 or 2
+  * Used fields: flags.
+    * Bit 7: unknown function
 === Subcommand 24: Search Audio ===
 === Subcommand 25: Seek Audio ===
@@ Line 16: / Line 66: @@
 === Subcommand 41: Read Zone List ===
 === Subcommand 50: Get Time ===
+  * Application ID: 0
+  * Used fields: data size, should be 7
+Reads a 7-byte data packet from the Hi-MD unit with the following layout:
+  Byte 00: Flags. Bit 7 = Ex; Bit 6 = Ef; Bit 5 = WP (write protect?)
+  Byte 01: second
+  Byte 02: minute
+  Byte 03: hour
+  Byte 04: day
+  Byte 05: month
+  Byte 06: year
 === Subcommand 60: Read Audio Status ===
 === Subcommand 90: Set Time ===
-=== Subcommand A0: Play audio part ===
+=== Subcommand A0: Play audio parts ===