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PC87332VLJ Datasheet(PDF) 36 Page - National Semiconductor (TI) |
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PC87332VLJ Datasheet(HTML) 36 Page - National Semiconductor (TI) |
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36 / 98 page ![]() 40 FDC Command Set Description (Continued) TABLE 4-1 Typical Format GAP3 Length Values based on Drive Data Rate Sector Sector EOT Sector Format Mode Size Code (Hex) Gap GAP3 (Decimal) (Hex) (Hex) (Note 1) (Hex) (Note 2) 250 kbps 256 01 12 0A 0C MFM 256 01 10 20 32 512 02 08 2A 50 512 02 09 2A 50 1024 03 04 80 F0 2048 04 02 C8 FF 4096 05 01 C8 FF 500 kbps 256 01 1A 0E 36 MFM 512 02 0F 1B 54 512 02 12 1B 6C 1024 03 08 35 74 2048 04 04 99 FF 4096 05 02 C8 FF 8192 06 01 C8 FF TABLE 4-2 Typical Format GAP3 Length Values Based on PC Compatible Diskette Media Media Sector Sector EOT Sector Format Type Size Code Hex Gap GAP3 Decimal Hex Hex Hex 360k 512 02 09 2A 50 12M 512 02 0F 1B 54 720k 512 02 09 1B 50 144M 512 02 12 1B 6C 288M (Note 3) 512 02 24 1B 53 Note 1 Sector Gap refers to the Intersector Gap Length parameter specified in the Command Phase of the Read Write Scan and Verify commands Although this is the recommended value the FDC treats this byte as a don’t care in the Read Write Scan and Verify commands Note 2 Format Gap is the suggested value to use in the Format Gap parameter of the Format command This is the programmable GAP3 as shown in Figure 4-1 Note 3 The 288M diskette media is a Barium Ferrite media intended for use in Perpendicular Recording drives at data rates up to 1 Mbps 36 |
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