HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 84

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

Rev. 0, 07/98, page 68 of 453
CLK (CPU modes 1, 2, 3)
HOLD (CPU mode 0)
HOLDA (CPU mode 0)
BUSY
BEO
CLK (CPU modes 1, 2, 3)
HOLD (CPU mode 0)
HOLDA (CPU mode 0)
BUSY
BEO
CLK (CPU mode 0)
BUSREQ
(CPU modes 1, 2, 3)
BUSACK
(CPU modes 1, 2, 3)
CLK (CPU mode 0)
BUSREQ
(CPU modes 1, 2, 3)
BUSACK
(CPU modes 1, 2, 3)
Figure 3.6 Bus Arbitration Sequence examples
Slave
mode
Input
Input
Slave mode
T
Master mode
i
DMA cycle
Output
T
1
Master mode
T
T
Example a
Example b
3
i
Output
DMA cycle
T
1
T
3
Input
Slave mode
Slave mode
Input