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LPC47B27X Datasheet(PDF) 49 Page - SMSC Corporation |
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LPC47B27X Datasheet(HTML) 49 Page - SMSC Corporation |
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49 / 196 page  SMSC LPC47B27x - 49 - Rev. 08-10-04 DATASHEET FORMAT FIELDS SYSTEM 34 (DOUBLE DENSITY) FORMAT GAP4a 80x 4E SYNC 12x 00 IAM GAP1 50x 4E SYNC 12x 00 IDAM C Y L H D S E C N O C R C GAP2 22x 4E SYNC 12x 00 DATA AM DATA C R C GAP3 GAP 4b 3x C2 FC 3x A1 FE 3x A1 FB F8 SYSTEM 3740 (SINGLE DENSITY) FORMAT GAP4a 40x FF SYNC 6x 00 IAM GAP1 26x FF SYNC 6x 00 IDAM C Y L H D S E C N O C R C GAP2 11x FF SYNC 6x 00 DATA AM DATA C R C GAP3 GAP 4b FC FE FB or F8 PERPENDICULAR FORMAT GAP4a 80x 4E SYNC 12x 00 IAM GAP1 50x 4E SYNC 12x 00 IDAM C Y L H D S E C N O C R C GAP2 41x 4E SYNC 12x 00 DATA AM DATA C R C GAP3 GAP 4b 3x C2 FC 3x A1 FE 3x A1 FB F8 Table 24 - Typical Values for Formatting FORMAT SECTOR SIZE N SC GPL1 GPL2 5.25" Drives FM 128 128 512 1024 2048 4096 ... 00 00 02 03 04 05 ... 12 10 08 04 02 01 07 10 18 46 C8 C8 09 19 30 87 FF FF MFM 256 256 512* 1024 2048 4096 ... 01 01 02 03 04 05 ... 12 10 09 04 02 01 0A 20 2A 80 C8 C8 0C 32 50 F0 FF FF 3.5" Drives FM 128 256 512 0 1 2 0F 09 05 07 0F 1B 1B 2A 3A MFM 256 512** 1024 1 2 3 0F 09 05 0E 1B 35 36 54 74 GPL1 = suggested GPL values in Read and Write commands to avoid splice point between data field and ID field of contiguous sections. GPL2 = suggested GPL value in Format A Track command. *PC/AT values (typical) **PS/2 values (typical). Applies with 1.0 MB and 2.0 MB drives. NOTE: All values except sector size are in hex. CONTROL COMMANDS Control commands differ from the other commands in that no data transfer takes place. Three commands generate an interrupt when complete: Read ID, Recalibrate, and Seek. The other control commands do not generate an interrupt. Read ID The Read ID command is used to find the present position of the recording heads. The FDC stores the values from the first ID field it is able to read into its registers. If the FDC does not find an ID address mark on the diskette after the second occurrence of a pulse on the nINDEX pin, it then sets the IC code in Status Register 0 to "01" (abnormal termination), sets the MA bit in Status Register 1 to "1", and terminates the command. |
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