Application Notes; Processing Flow; Begin Timing Of Protocol Sequence; Receive Operation And The Status Byte - Fujitsu MB86R02 Jade-D Hardware Manual

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MB86R02 'Jade-D' Hardware Manual V1.64

Figure 16-13 Continuous data bytes with continuous HOST XCS

16.5. Application Notes

The protocol sequence sent to the HOSTIF module must begin with CMDSEQ after booting has

Normal receive operation is confirmed using five bits in the STATUS byte. If the corresponding

five bits are all High, the system is in normal receive operation mode. If, for example, the

STATUS byte always contains Low bits or always contains High bits, normal receive operation is

not functional.

The host CPU can freely select an address byte when accessing the MB86R02. If the address is

not set, the previous address is maintained and therefore it is not necessary to repeat the

address byte with every access. This implements a very effective forwarding mechanism, an

example of which is shown below.

Indigo Address

Figure 16-14 Example of setting the address (for write processing)

(s wa p i s not s et. )

When AB#1-3 i s not s et,

the l a s t va l ue i s

mai nta i ned.

When bei ng acces s i t

next ti me, the va l ue i s

us ed a ga i n.