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6. FUNCTIONAL DESCRIPTION The function ofthe card is determined by the combination of the following five control signals, REG#, CEl#, CE2#, OE#, WE#; active low signals. (Please refer to section 10 FUNCTION TABLE on page 5) (1)COMMON MEMORY FUNCTION When REG# signal is high level, the common memory area is selected. (a)READ MODE To read, WE# is set high level and CEl# or CE2# is set low level and the memory address is applied at inputs AO-A21(4MB). Setting OE# low level executes the reading with output at data-bus. It is available to make the following functions according to the combination of CEl# and CE2#. When CEl# is set low level and CE2# is set high level, the card operates as an 8 bit data-bus width card. The data can be dealt with lower data-bus(DO-D7). When both CEl# and CE2# are set low level, the card operates as a 16 bit data-bus width card. At this mode LSB ofaddress-bus (AO) is ignored. In addition odd byte can be accessed through upper data-bus(D8-D15) when CEl# is set high level and CE2# is set low level. This mode is useful when handling only odd bytes in the 16 bit data-bus interface system (AO is ignored). When both CEl# and CE2# are set high level, the card becomes a standby mode where the card consumes low power and the data-bus is placed in high impedance state (above functions of CEl# and CE2# are the same as in the following modes). When both OE# and WE# are set high level, the card becomes a output disable mode and the data-bus is placed in high impedance state. (b)WRITE MODE To write, the memory address is first applied at inputs AO-A21(4MB) and the data is applied at output pins. Setting CEl# or CE2# low level, WE# low level and OE# high level executes the writing. (2)ATTRIBUTE MEMORY FUNCTION When REG# is set low level, the attribute memory area is selected. MF3XXX-J9CATXX series have no attribute memory but outputs FFh on the lower data-bus(DO-D7) when the following conditions are applied (a)setting CEl# low, CE2# high, OE# low, WE# high and AO low (b)setting CEl# low, CE2# low, OE# low and WE# high (3)BATTERY When the card is used for long periods of time, eventually battery exhaustion occurs. If such a situation is encountered, replace any exhausted battery with a new one as directed in section 21.2 "REPLACING BATTERY" (page 14). The replacement battery model number is indicated under section 21 "BATTERY SPECIFICATIONS"(page 14).
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