Chapter 3 – DFI CD905-B2800 User Manual
Page 18
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Chapter 3 Hardware Installation
18
Chapter 3
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
PU/PD
Description
IDE_D0
D7
IDE_D1
C10
IDE_D2
C8
IDE_D3
C4
IDE_D4
D6
IDE_D5
D2
IDE_D6
C3
IDE_D7
C2
PD 10K
IDE_D8
C6
IDE_D9
C7
IDE_D10
D3
IDE_D11
D4
IDE_D12
D5
IDE_D13
C9
IDE_D14
C12
IDE_D15
C5
IDE_A0
D13
IDE_A1
D14
IDE_A2
D15
IDE_IOW#
D9
O CMOS
3.3V / 3.3V
I/O write line to IDE device. Data latched on trailing (rising) edge.
IDE_IOR#
C14
O CMOS
3.3V / 3.3V
I/O read line to IDE device.
IDE_REQ
D8
I CMOS
3.3V / 5V
PD 5.6K
IDE Device DMA Request. It is asserted by the IDE device to request a data transfer.
IDE_ACK#
D10
O CMOS
3.3V / 3.3V
IDE Device DMA Acknowledge.
IDE_CS1#
D16
O CMOS
3.3V / 3.3V
IDE Device Chip Select for 1F0h to 1FFh range.
IDE_CS3#
D17
O CMOS
3.3V / 3.3V
IDE Device Chip Select for 3F0h to 3FFh range.
IDE_IORDY
C13
I CMOS
3.3V / 5V
PU 4.7k to 3.3V
IDE device I/O ready input. Pulled low by the IDE device to extend the cycle.
IDE_RESET#
D18
O CMOS
5V
PU10k to 5V
Reset output to IDE device, active low.
IDE_IRQ
D12
I CMOS
3.3V / 5V
PD 10K
Interrupt request from IDE device.
IDE_CBLID#
D77
I CMOS
3.3V / 5V
PD 10K
Input from off-Module hardware indicating the type of IDE cable being
used. High indicates a 40-pin cable used for legacy IDE modes. Low
indicates that an 80-pin cable with interleaved grounds is used. Such a
cable is required for Ultra-DMA 66, 100 and 133 modes.
IDE Signals Descriptions
I/O CMOS
3.3V / 5V
Bidirectional data to / from IDE device.
O CMOS
3.3V / 3.3V
Address lines to IDE device.