SW00ENB-ZCC Toshiba, SW00ENB-ZCC Datasheet - Page 122
SW00ENB-ZCC
Manufacturer Part Number
SW00ENB-ZCC
Description
MCU, MPU & DSP Development Tools CASEWORKS
Manufacturer
Toshiba
Datasheet
1.SW00ENB-ZCC.pdf
(464 pages)
Specifications of SW00ENB-ZCC
Tool Type
Development Software Support
Core Architecture
870
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.3.3
Internal clock
Internal address
External address
BUSRQ
BUSAK
Internal clock
Internal address
External address
BUSRQ
BUSAK
1. BUSRQ is sampled high.
2. The TMP1940CYAF recognizes the assertion of BUSRQ .
3. The TMP1940CYAF asserts BUSAK at the completion of the current bus cycle. The external bus
1. The external bus master has control of the bus.
2. When the external bus master no longer needs the bus, it deasserts BUSRQ .
3. In response to the deassertion of BUSRQ , the TMP1940CYAF deasserts BUSAK .
Relinquishing the bus
the bus to the TMP1940CYAF. Figure 8.12 shows the timing for an external bus master to relinquish
the bus.
master recognizes BUSAK and assumes bus mastership to start a bus transfer.
When the external bus master has completed its bus transactions, it deasserts BUSRQ to relinquish
TMP1940CYAF external access
TMP1940CYAF external access
Figure 8.12 External Bus Master Relinquishing the Bus
Figure 8.11 Bus Arbitration Timing Diagram
1
TMP1940CYAF
TMP1940CYAF
2
TMP1940CYAF-80
3
External bus master
External bus masters
TMP1940CYAF external access
TMP1940CYAF
1
‡ @‡ A ‡ B
external access
2 3
TMP1940CYAF
TMP1940CYAF
TMP1940CYAF
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