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Brother DP-525CJ Service Manual: Fdd Operation; 10.2.1. Basic Operation; Interface Between Cbic (#8) And Fdc (#5); Fig.2.26 Fdd Block Diagram

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FDD Operation

10.2.1. Basic Operation

CBIC(#8) writes commands to FDC(#5), and the FDC(#5) controls the FDD in
accordance with these commands and reads/writes data.
See Fig. 2.26.

10.2.2. Interface between CBIC (#8) and FDC (#5)

If CBIC(#8) accesses an internal register other than the data resister in FDC (#5), the
normal read/write operation will be performed.
If CBIC(#8)transmits data to or receives data from FDC (#5), DMA communications will
be performed using the DMA function of CBIC(#8).
CBIC(#8) resets FDC(#5),detects the density signal which indicates whether the floppy
disk is a 2DD or 2HD, and output to FDC(#5).

Fig.2.26 FDD Block Diagram




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  • brian aaron Jan 27, 2017 03:48:
    ​I have a brother dp 540cj and it has a built in diskette drive.
    I have a ibm thinkpad latop. I connected a Memorex external usb floppy drive to the ibm thinkpad laptop. i'm copying 3 files from the ibm thinkpap (notepad) to the square 1.44 mb diskette. no problem, the 3 files were copied to the diskette.
    ​I turn on the brother dp 540cj, select file manager, insert the square diskette. the brother dp 540cj open only the file names on the disk. I try to open word text on either of the 3 files on the disk and the brother dp 540cj don't open the word text in any of the 3 files. I have been trying for several days to open the word text on the files using the brother dp 540cj and don't have any further instructio​ns for this problem. I tried saving the file names to all coding - Unicode, ansi utf-8 and can't fix the electronic problem.
    m​y email address is snowwash@j​