[signal]

[I/O]

[Description]

DIOR–

I

DIOR– is the strobe signal asserted by the host to read device

 

 

registers or the data port.

HDMARDY–

I

HDMARDY– is a flow control signal for Ultra DMA d ata in bursts.

 

 

This signal is asserted by the host to indicate to the device that the

 

 

host is ready to receive Ultra DMA data in bursts.

 

 

The host may negate HDMARDY- to pause an Ultra DMA data in

 

 

burst.

HSTROBE

I

HSTROBE is the data out strobe signal from the host for an Ultra

 

 

DMA data out burst. Both the rising and falling edge of HSTROBE

 

 

latch the data from DATA 0-15 into the device. The host may stop

 

 

generating HSTROBE edges to pause an Ultra DMA data out burst.

INTRQ

O

Interrupt signal to the host.

 

 

This signal is negated in the following cases:

 

 

– assertion of RESET– signal

 

 

– Reset by SRST of the Device Control register

 

 

– Write to the command register by the host

 

 

– Read of the status register by the host

 

 

– Completion of sector data transfer

 

 

(without reading the Status register)

 

 

When the device is not selected or interrupt is disabled, the INTRQ

 

 

Signal shall be in a high impedance state.

CS0–

I

Chip select signal decoded from the host address bus. This signal is

 

 

used by the host to select the command block registers.

CS1–

I

Chip select signal decoded from the host address bus. This signal is

 

 

used by the host to select the control block registers.

DA 0-2

I

Binary decoded address signals asserted by the host to access task

 

 

file registers.

KEY

–

Key pin for prevention of erroneous connector insertion

PIDAG–

I/O

This signal is an input mode for the master device and an output

 

 

mode for the slave device in a daisy chain configuration. This signal

 

 

indicates that the slave device has been completed self diagnostics.

 

 

This signal is pulled up to +5 V through 10 kΩ resistor at each device.

CBLID–

I/O

This signal is used to detect the cable type (80 or 40-conductor

 

 

cable) installed in the system. This signal is pulled up to +5 V

 

 

through 10 kΩ resistor at each device.

DASP–

I/O

This is a time-multiplexed signal that indicates that the device is

 

 

active and a slave device is present.

 

 

This signal is pulled up to +5 V through 10 kΩ resistor at each device.

5 - 4

C141-E106-01EN

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Fujitsu MPF3XXXAH manual Dior, Hdmardy, Hstrobe, Pidag, Cblid, Dasp
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