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User' s Manual
3.7.10
Signal Description – IDE Device Connector (IDE_1 / IDE_2)
The IDE interface supports PIO modes 0 to 4 and Bus Master IDE. Data transfer rates up
to 100 MB/Sec is possible.
DA [2:0]
IDE Address Bits. These address bits are used to access a register or data port in a device
on the IDE bus.
DCS1#,
IDE Chip Selects. The chip select signals are used to select the command block registers in
DCS3#
an IDE device. DCS1# selects the primary hard disk.
D [15:0]
IDE Data Lines. D [15:0] transfers data to/from the IDE devices.
IOR#
IDE I/O Read. Signal is asserted on read accesses to the corresponding IDE port addresses.
IOW#
IDE I/O Write. Each signal is asserted on write accesses to corresponding the IDE port
addresses.
IORDY
When deasserted, these signals extend the transfer cycle of any host register access when
the device is not ready to respond to the data transfer request.
RESET#
IDE Reset. This signal resets all the devices that are attached to the IDE interface.
IRQ14
Interrupt line from hard disk. Connected directly to PC-AT bus.
DREQ
The DREQ is used to request a DMA transfer from the South Bridge. The direction of the
transfers is determined by the IOR#/IOW# signals.
DACK#
DMA Acknowledge. The DACK# acknowledges the DREQ request to initiate DMA transfers.
DACT#
Signal from hard disk indicating hard disk activity. The signal level depends on the hard disk
type, normally active low. The signal is routed directly to the LED1.
28 ECM-5716 Series User' s Manual
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