Motorola MCF5282, MCF5281 user manual Fill Command Format, Fill Command Sequence

Models: MCF5282 MCF5281

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Background Debug Mode (BDM)

The size field is examined each time a FILL command is processed, allowing the operand size to be altered dynamically.

Command Formats:

15

 

 

 

12

11

 

 

 

8

7

4

3

0

Byte

 

 

0x1

 

 

 

0xC

 

0x0

 

 

0x0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

X

 

X

X

X

X

 

X

X

 

D[7:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Word

 

 

0x1

 

 

 

0xC

 

0x4

 

 

0x0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D[15:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Longword

 

 

0x1

 

 

 

0xC

 

0x8

 

 

0x0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D[31:16]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D[15:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 29-27. FILL Command Format

Command Sequence:

FILL (LONG)

???

FILL (B/W)

???

MS DATA

’NOT READY’

XXX

’ILLEGAL’

DATA

’NOT READY’

XXX

’ILLEGAL’

LS DATA

’NOT READY’

NEXT CMD

’NOT READY’

WRITE

MEMORY

LOCATION

NEXT CMD

’NOT READY’

WRITE

 

XXX

 

MEMORY

 

 

 

’NOT READY’

 

LOCATION

 

 

 

 

 

NEXT CMD

 

 

’CMD COMPLETE’

 

 

XXX

NEXT CMD

 

 

BERR

’NOT READY’

 

 

XXX

 

 

’NOT READY’

 

 

 

NEXT CMD

 

 

 

’CMD COMPLETE’

 

 

 

XXX

NEXT CMD

 

 

BERR

’NOT READY’

Figure 29-28. FILL Command Sequence

Operand Data:

A single operand is data to be written to the memory location. Byte

 

data is sent as a 16-bit word, justified in the least-significant byte; 16-

 

and 32-bit operands are sent as 16 and 32 bits, respectively.

Result Data:

Command complete status (0xFFFF) is returned when the register

 

write is complete. A value of 0x0001 (with S set) is returned if a bus

 

error occurs.

29-30

MCF5282 User’s Manual

MOTOROLA

Page 702
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Motorola MCF5282, MCF5281 user manual Fill Command Format, Fill Command Sequence