參數(shù)資料
型號: μPD705100
廠商: NEC Corp.
英文描述: 32 Bit Microprocessor(32 位微處理器)
中文描述: 32位微處理器(32位微處理器)
文件頁數(shù): 33/81頁
文件大?。?/td> 441K
代理商: ΜPD705100
33
CHAPTER 4 32-BIT BUS MODE
CHAPTER 4 32-BIT BUS MODE
If the SIZ16B input, sampled at reset, is inactive, the external bus width becomes 32 bits (32-bit bus mode).
In this mode, BE2/BH acts as BE2 and BE3/A1 acts as BE3.
4.1 RELATIONSHIP BETWEEN EXTERNAL ACCESS AND DATA BUS
This section explains data I/O and the byte enable signals (BEn) at external accesses.
4.1.1 Relationship between External Accesses and Byte Enable Signals
In 32-bit bus mode, BE0-BE3 are output. External accesses are related to byte enable signals as indicated
below.
Table 4-1. 32-Bit Bus Mode
Data length
Operand address
Byte enable
State
Bit 1
Bit 0
BE3
BE2
BE1
BE0
Byte
0
0
1
1
1
0
Ta,Ts
0
1
1
1
0
1
Ta,Ts
1
0
1
0
1
1
Ta,Ts
1
1
0
1
1
1
Ta,Ts
Halfword
0
0
1
1
0
0
Ta,Ts
1
0
0
0
1
1
Ta,Ts
Word
0
0
0
0
0
0
Ta,Ts
Burst transfer
0
0
0
0
0
0
Ta,Tb1
0
0
0
0
0
0
Tb2
0
0
0
0
0
0
Tb3
0
0
0
0
0
0
Tb4
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