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UPD703103A Datasheet(PDF) 46 Page - NEC

No. de Pieza. UPD703103A
Descripción  32-Bit Single-Chip Microcontrollers
Descarga  99 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD703103A Datasheet(HTML) 46 Page - NEC

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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


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