THEORY
SERVICE MANUAL
Electrical
2-25
10.2. 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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