參數(shù)資料
型號: EC000UM
英文描述: EC000 Core User's Manual (SCM68000)
中文描述: EC000核心用戶手冊(SCM68000)
文件頁數(shù): 97/145頁
文件大?。?/td> 829K
代理商: EC000UM
Bus Operation
3-14
EC000 CORE PROCESSOR USER’S MANUAL
MOTOROLA
The descriptions of the read-modify-write cycle states are as follows:
STATE 0
The read cycle starts in state 0 (S0). The SCM68000 places valid function codes on FC2–
FC0 and a valid address on the address bus. RWB and ERWB are driven to a logic high
to identify a read cycle, and TSCAE is driven to a logic high to indicate that the SCM68000
is between bus cycles.
STATE 1
Entering state 1 (S1), TSCAE is driven low to indicate the beginning of the bus cycle, and
RMCB is driven low to indicate a read-modify-write cycle.
Figure 3-13. Read-Modify-Write Cycle Timing Diagram
CLKI
A31–A0
ASB
S0
S1 S2
S3 S4
S5 S6
S7
S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19
UDSB or LDSB
RWB
DTACKB
D7–D0
FC2–FC0
DSB
ERWB
D15–D8
AOEB
COEB
DOEB
RMCB
SIZ1–SIZ0
TSCAE
INDIVISIBLE CYCLE
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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