15
15-13
Ver.0.10
Figure 15.3.2 Bus Arbitration Timing
EXTERNAL BUS INTERFACE
15.3 Bus Arbitration
Note 1 : Circles above indicate points at which signals are sampled.
Note 2 : Hi-z indicate the high-impedance state.
Note 3 : Idle cycles are inserted only when the hold state is assumed after external lead access.
(2) When Bus Mode Control Register = 1
____
When HREQ pin input is pulled low and the hold request is accepted, the 32170 goes to a hold state
____
and outputs a low from the HACK pin. During hold state, all bus related pins are placed in the high-
impedance state, allowing data to be transferred on the system bus. To exit the hold state and
____
return to normal operating state, release the HREQ signal back high.
DB0 - DB15
BCLK
Hi-Z
AA
AA
HREQ
HACK
A11 - A30
CS0 , CS1
RD
WR
BHW , BLW
WAIT
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Bus cycle
Idle
Go
to
hold
Hold state
Return
Next bus
cycle
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...