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參數(shù)資料
| 型號(hào)： | UPD70F3134AY |
| 廠商： | NEC Corp. |
| 英文描述： | 32-Bit Single-Chip Microcontrollers |
| 中文描述： | 32位單芯片微控制器 |
| 文件頁(yè)數(shù)： | 46/99頁(yè) |
| 文件大?。?/td> | 528K |
| 代理商： | UPD70F3134AY |
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CHAPTER 3 SPECIFICATIONS OF PCI HOST BRIDGE MACRO
Application Note U17121EJ1V1AN
46
3.7 Bus Width of External Bus Interface
The operation mode of the data bus with respect to the external bus interface can be changed via the I_MODE16
pin status.
Cautions 1. Do not change the status of the I_MODE16 pin during operation.
2. The I_MODE16 pin can only be used to change the operation mode of the data bus with
respect to the external bus slave interface.
To change the data bus width of the SDRAM bus interface, use the BUS_SIZE bit in 3.4.10
SDRAM_CTL register.
3. The setting of the I_MODE16 pin should correspond with the external bus interface operation
mode of the CPU.
4. When 16-bit mode is set, the access cycle is divided for 32-bit access on the external bus
interface. Accordingly, access is divided similarly on the PCI bus interface. Therefore, when
16-bit mode is set, because a 32-bit access cycle is not generated on the PCI bus interface, a
PCI device whose registers are only valid for 32-bit access cannot be accessed.
Table 3-4. I_MODE16 Pin Status and Operation Mode of Data Bus
I_MODE16 Pin
Data Bus Operation Mode
Remark
Low level
32-bit mode
32-bit data bus
High level
16-bit mode
16-bit data bus
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD70F3134AYF1-EN4 | 32-Bit Single-Chip Microcontrollers |
| UPD70F3134AYGJ-UEN | 32-Bit Single-Chip Microcontrollers |
| UPD71088C-10 | System Bus Controller |
| UPD71088C-8 | System Bus Controller |
| UPD71088G-8 | System Bus Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD70F3134AYF1-EN4 | 制造商:NEC 制造商全稱:NEC 功能描述:32-Bit Single-Chip Microcontrollers |
| UPD70F3134AYGJ-UEN | 制造商:NEC 制造商全稱:NEC 功能描述:32-Bit Single-Chip Microcontrollers |
| UPD70F3134BYGJ-UEN-A | 制造商:Renesas Electronics 功能描述:Cut Tape 制造商:Renesas 功能描述:MCU 32-bit V850E RISC 512KB Flash 3.3V 144-Pin LQFP |
| UPD70F3134GJ-UEN | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD70F3134GJ-UEN-A | 制造商:Renesas Electronics Corporation 功能描述: |
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