Difference between revisions of "SYMBiFACE II:IDE registers"

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This is the documentation about the '''IDE registers''' of the [[SYMBiFACE II]] expansion card. For more information about IDE please check for general specifications in the internet ''(can anyone provide good links here?)''.
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The Symbiface 2 operates the ATA/IDE device in 16-bit data transfer mode. 16-bits of data is buffered at a time within the Symbiface 2 and read/written via the Data port I/O address 8 bits at a time. The device was designed when devices didn't support ATA CFA command set and 8-bit PIO data transfer so this is why it buffers 16-bit of data. (16-bits is the "native" data transfer of an ATA device).
  
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<pre>
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The I/O ports operate in a "pass-through" like mode where the registers directly reflect those of the connected ATA device.
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Port         Read               Write
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------------------------------------------------
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The [[X-Mass]] is a more modern ATA/IDE device which is compatible with the Symbiface 2 IDE registers and uses the same I/O ports.
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#FD06         Alternate Status   Digital Output
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#FD07         Drive Address       Not Used
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This is the documentation about the '''IDE registers''' of the [[SYMBiFACE II]] expansion card.
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#FD08         Data Register       Data Register
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#FD09         Error Register     (Write Precomp Reg.)
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{|{{Prettytable|width: 700px; font-size: 2em;}}
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#FD0A         Sector Count       Sector Count
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|'''Port''' || '''Read''' || '''Write'''
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#FD0B         Sector Number       Sector Number
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|-
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#FD0C         Cylinder Low       Cylinder Low
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|'''#FD06''' || Alternate Status || Digital Output
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#FD0D         Cylinder High       Cylinder High
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|-
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#FD0E         SDH Register       SDH Register
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|'''#FD07''' || Drive Address || ''(Not Used)''
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#FD0F         Status Register     Command Register
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|-
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</pre>
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|'''#FD08''' || Data Register || Data Register
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|-
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|'''#FD09''' || Error Register || Features Register/''(Write Precomp Reg.)''
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|-
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|'''#FD0A''' || Sector Count (0=256) || Sector Count (0=256)
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|-
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|'''#FD0B''' || Sector Number for CHS or LBA bits 0-7 || Sector Number for CHS or LBA bits 0-7
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|-
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|'''#FD0C''' || Cylinder Low for CHS or LBA bits 8-15 || Cylinder Low for CHS or LBA bits 8-15
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|-
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|'''#FD0D''' || Cylinder High for CHS or LBA bits 16-23 || Cylinder High for CHS or LBA bits 16-23
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|-
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|'''#FD0E''' || Device/Head Register (Bit 6=0 CHS, Bit 6=1 LBA) (Bit 4 = 0 Master, Bit 4 = 1 Slave) (Bits 3..0 Head for CHS or LBA bits 24-27) ||  Device/Head Register (Bit 6=0 CHS, Bit 6=1 LBA) (Bit 4 = 0 Master, Bit 4 = 1 Slave) (Bits 3..0 Head for CHS or LBA bits 24-27)
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|-
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|'''#FD0F''' || Status Register || Command Register
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|}
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== See also ==
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* [[SYMBiFACE II:IDE routines|Low level IDE routines]]
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* [[Programming:SYMBiFACE_II|SYMBiFACE II documentations]]
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* [http://www.t13.org/documents/UploadedDocuments/project/d1153r18-ATA-ATAPI-4.pdf ATA/IDE-specification]
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[[Category:Programming]]

Latest revision as of 03:52, 15 January 2018

The Symbiface 2 operates the ATA/IDE device in 16-bit data transfer mode. 16-bits of data is buffered at a time within the Symbiface 2 and read/written via the Data port I/O address 8 bits at a time. The device was designed when devices didn't support ATA CFA command set and 8-bit PIO data transfer so this is why it buffers 16-bit of data. (16-bits is the "native" data transfer of an ATA device).

The I/O ports operate in a "pass-through" like mode where the registers directly reflect those of the connected ATA device.

The X-Mass is a more modern ATA/IDE device which is compatible with the Symbiface 2 IDE registers and uses the same I/O ports.

This is the documentation about the IDE registers of the SYMBiFACE II expansion card.

Port Read Write
#FD06 Alternate Status Digital Output
#FD07 Drive Address (Not Used)
#FD08 Data Register Data Register
#FD09 Error Register Features Register/(Write Precomp Reg.)
#FD0A Sector Count (0=256) Sector Count (0=256)
#FD0B Sector Number for CHS or LBA bits 0-7 Sector Number for CHS or LBA bits 0-7
#FD0C Cylinder Low for CHS or LBA bits 8-15 Cylinder Low for CHS or LBA bits 8-15
#FD0D Cylinder High for CHS or LBA bits 16-23 Cylinder High for CHS or LBA bits 16-23
#FD0E Device/Head Register (Bit 6=0 CHS, Bit 6=1 LBA) (Bit 4 = 0 Master, Bit 4 = 1 Slave) (Bits 3..0 Head for CHS or LBA bits 24-27) Device/Head Register (Bit 6=0 CHS, Bit 6=1 LBA) (Bit 4 = 0 Master, Bit 4 = 1 Slave) (Bits 3..0 Head for CHS or LBA bits 24-27)
#FD0F Status Register Command Register

See also

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