Chapter 3 Memory; Memory Access Modes; Table 3.1A Memory Access Mode - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

Chapter 3:
Memory

3.1 Memory Access Modes

2
In the F MC-16LX, there are several modes for access methods, access areas, and test methods. In this
module, the following classifications apply:
Operation Mode
RUN
EPROM Write
Test Functions
Operation mode
Operation mode means the mode for controlling the device operation status. The operation mode is
specified by the MDx mode setting pin and the Ex bit in mode data. By selecting an operation mode,
normal operation, internal test program activation, or special test function activation can be performed.
Bus mode
Bus mode means the mode for controlling the internal ROM operation and external access function. The
bus mode is specified by the MDx mode setting pin and the Mx bit in mode data. The MDx mode setting
pin specifies the bus mode for reading the reset vector and mode data, and the Mx bit in mode data
specifies the bus mode for normal operation.
Access mode
Access mode means the mode for controlling the external data bus width. The access mode is specified by
the MDx mode setting pin and the Sx bit in mode data. By selecting an access mode, an 8- or 16-bit
external data bus is specified.

Table 3.1a Memory Access Mode

Bus Mode
Single Chip
Internal ROM, external bus
External ROM, external bus
———
———
Access Mode
(External data bus width)
———
8 bit
16 bit
8 bit
16 bit
———
———