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PC87309VLJ データシート(PDF) 66 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 PC87309VLJ
部品情報  PC87309 SuperI/O Plug and Play Compatible Chip in Compact 100-Pin VLJ Packaging
PDF  192 Pages
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87309VLJ データシート(HTML) 66 Page - National Semiconductor (TI)

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The Floppy Disk Controller (FDC) (Logical Device 0)
66
www.national.com
Result Phase
Upon terminating the execution phase of the READ DATA
command, the controller asserts IRQ6, indicating the begin-
ning of the result phase. The microprocessor must then
read the result bytes from the FIFO.
The values that are read back in the result bytes are shown
in TABLE 3-17 on page 66. If an error occurs, the result
bytes indicate the sector read when the error occurred.
3.7.11
The READ DELETED DATA Command
The READ DELETED DATA command reads logical sec-
tors containing a Address Mark (AM) for deleted data from
the selected drive and makes the data available to the host
microprocessor.
This command is like the READ DATA command, except for the
setting of the Control Mark bit (bit 6) in ST2 and the skipping of
sectors. See description of execution phase. See READ DATA
command for a description of the command bytes.
Command Phase
Execution Phase
Data read from disk drive is transferred to the system in
DMA or non-DMA modes. See Section 3.4.2 on page 45.
See TABLE 3-17 on page 66 for the state of the result bytes
when the command terminates normally. The effect of Skip
Control (SK) on the READ DELETED DATA command is
summarized in TABLE 3-18 on page 67.
TABLE 3-17. Result Phase Termination Values with No Error
1. End of Track sector number from the command phase.
2. The number of the sector last operated on by controller.
3. Track number programmed in the command phase
76543210
Result Phase Status Register 0 (ST0)
Result Phase Status Register 1 (ST1)
Result Phase Status Register 2 (ST2)
Track Number
Head Number
Sector Number
Bytes-Per-Sector Code
76543210
MT
MFM
SK
01100
IPS
XXXX
HD
DS1
DS0
Track Number
Head Number
Sector Number
Bytes-Per-Sector Code
End of Track (EOT) Sector Number
Bytes Between Sectors - Gap 3
Data Length (Obsolete)
Multi-Track
(MT)
Head #
(HD)
End of Track (EOT)
Sector Number
ID Information in Result Phase
Track Number Head Number Sector Number
Bytes-per-Sector
Code
0
0
< EOT1 Sector #
No Change
No Change
Sector2 # + 1
No Change
00
= EOT1 Sector #
Track3 # + 1
No Change
1
No Change
01
< EOT1 Sector #
No Change
No Change
Sector2 # + 1
No Change
01
= EOT1 Sector #
Track3 # + 1
No Change
1
No Change
10
< EOT1 Sector #
No Change
No Change
Sector2 # + 1
No Change
10
= EOT1 Sector #
No Change
1
1
No Change
11
< EOT1 Sector #
No Change
No Change
Sector2 # + 1
No Change
11
= EOT1 Sector #
Track3 # + 1
0
1
No Change



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