RF5C396 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RF5C396

COMPLIANT WITH PCMCA2.1/JEIDA4.2 PC CARD CONTROLLER

RICOH Co.,Ltd. 

RF5C296/RF5C396L/RB5C396/RF5C396

The TC# (terminal count) pin signal input to the PC card becomes active low for output from the OE# pin at a

cycle for reading from the PC card (a cycle for writing to the memory) and from the E# pin at a cycle for writing to

the PC card (a cycle for reading from the memory). Further, the output REG# pin signal is always held at high level

during DMA transfer. Thus, it is easy to distinguish between DMA transfer and ordinary bus cycles. Namely, the

REG# pin signal functions as DMA transfer acknowledgment for the PC card.

Notice on the DMA mode

1) IRQ9, IRQ10 and IRQ11 (or IRQ15) are redefined as DMA signals for ISA Bus. Therefore these signals can not

be used as interrupt lines.

2) Bit5 of General Control Register must be set to “1” to select I/O card.

3) If WP/IOIS16# is used as DREQ, bit4 of Interface Status Register indicates DREQ from PC Card.

4) If BVD2/SPKR# is used as DREQ, SPKROUT# and LED output can not be used.

5) If INPACK# is used as DREQ, bit2 of Mode Control Register 2 must be kept “0”.

6) TC input can be assigned to one of two IRQ signals (IRQ11 or IRQ15) by setting bit4 of Mode Control Register .

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