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): 94/145頁
文件大小: 829K
代理商: EC000UM
Bus Operation
MOTOROLA
EC000 CORE PROCESSOR USER’S MANUAL
3-11
The descriptions of the eight states of a write cycle are as follows:
STATE 0
The write 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.
TSCAE is driven to a logic high to indicate that the SCM68000 is between bus cycles.
STATE 1
Entering state 1 (S1), the SCM68000 drives TSCAE and ERWB to logic lows.
Figure 3-11. Word and Byte Write Cycle Timing Diagram for 16-Bit Mode
S0 S1 S2 S3 S4 S5 S6
S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7
CLKI
FC2–FC0
ASB
UDSB
LDSB
DTACKB
D15–D8
RWB
ERWB
AOEB
COEB
TSCAE
WORD WRITE
ODD BYTE WRITE
EVEN BYTE WRITE
DOEB
RMCB
DSB
A31–A0
A0=0
A0=1
D7–D0
SIZ1–SIZ0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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