HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 85

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

CLK (CPU modes 1, 2, 3)
CLK (CPU mode 0)
BUSREQ
(CPU modes 1, 2, 3)
HOLD (CPU mode 0)
BUSACK
(CPU modes 1, 2, 3)
HOLDA (CPU mode 0)
BUSY
BEO
BEO
Figure 3.6 Bus Arbitration Sequence Examples (cont)
Figure 3.7 Bus Arbitration System Block Diagram
BUSACK
SCA
Slave mode
Input
BUSREQ
Bus arbiter
BUSY
Higher MPU
V
Example c
CC
T
i
Master mode
Output
DMA cycle
T
bus master
Rev. 0, 07/98, page 69 of 453
1
Another
T
2
T
3
Input
Slave
mode