Host Interface

4.2 Signal Description

Table 4.2 Signal description (1/2)

PIN

Signal name

I/O

Description

 

 

 

 

1

RESET-

I

Reset signal

 

 

 

 

3, 5, 7, 9, 11,

DD7-0

I/O

The low-order bus is a 8-bit bidirectional bus signal for

13, 15, 17, 18,

DD15-8

 

exchanging the status, data, and control data between

16, 14, 12, 10,

 

 

the host and ODD.

8, 6, 4

 

 

The high-order bus is used for 16-bit data transfers only.

 

 

 

 

21

DMARQ

O

Data request signal for DMA transfer

 

 

 

 

23

DIOW-

I

Write strobe signal.

 

STOP

 

Indicates that transfer has ended at Ultra DMA transfer.

 

 

 

 

25

DIOR-

I

Read strobe signal

 

HDMARDY-

 

Indicates that the host can receive Ultra DMA data at

 

HSTROBE

 

Ultra DMA in transfer.

 

 

 

 

 

 

The ODD latches data at both edges of this signal at

 

 

 

Ultra data out transfer.

 

 

 

 

27

IORDY

O

This is the ready signal for the host computer. The ODD

 

DDMARDY-

 

uses this signal to request an extension of the transfer

 

 

cycle when it cannot prepare a response to a data

 

DSTROBE

 

 

 

transfer request from the host computer in time.

 

 

 

Indicates that the ODD can receive Ultra DMA data at

 

 

 

Ultra DMA out transfer.

 

 

 

The host latches data at both edges of this signal at Ultra

 

 

 

data in transfer.

 

 

 

 

28

CSEL

I

Sets the ODD to the master (device 0) or slave (device

 

 

 

1).

 

 

 

Effective by jumpering.

 

 

 

 

29

DMACK-

I

Answer signal in response to DMARQ during DMA

 

 

 

transfer

 

 

 

 

31

INTRQ

O

Interrupt signal to the host

 

 

 

 

32

IOCS16-

O

Indicates that the ODD is ready for 16-bit transfer when

 

 

 

the host addresses the 16-bit data port during PIO

 

 

 

transfer.

 

 

 

 

36, 33, 35

DA2, 1, 0

O

Address signal used by the host to address the ODD task

 

 

 

file register

 

 

 

 

34

PDIAG-

I/O

Used by the slave (device 1) to notify the master (device

 

CBLID-

 

0) that diagnostics ended

 

 

 

 

 

 

 

4-4

C156-E205-01EN

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Fujitsu MCJ3230AP manual Signal Description, Signal description 1/2