CSEL

O

28

If jumper pins B through D are assigned, Master/Slave setting with this pin is valid.

 

 

 

When grounded, the drive recognizes itself as a Master. When not grounded, the

 

 

 

drive recognizes itself as a Slave.

- DMACK

O

29

Responding to DMARQ, this signal indicates that the host is ready to receive or

 

 

 

send the data.

INTRQ

I

31

Interrupt to the host system, enabled only when the drive is selected and the host

 

 

 

activates the - IEN bit in the Device Control register. When the - IEN bit is inactive

 

 

 

or the drive is not selected, this output is in a high impedance state, whether an

 

 

 

interrupt is set or not.

 

 

 

The interrupt is set when the IRQ bit is set by the drive CPU. IRQ is reset to zero

 

 

 

when host reads the Status register or a write to the command register or when

 

 

 

DRQ is negated.

- IOCS16

I

32

Indication to the host system that the 16 bit data register has been addressed and

 

 

 

that the drive is ready to send or receive a 16 bit data word (open drain).

DA 1

O

33

Address line from the host system to select the registers of the drive.

- PDIAG

I/O

34

In Master/Slave mode, this signal reports the presence of slave drive to master

／CBLID

 

 

drive and enables transmitting of diagnostic result between master drive and slave

 

 

 

drive

DA 0

O

35

Address line from the host system to select the registers of the drive.

DA 2

O

36

Address line from the host system to select the registers of the drive.

- CS0

O

37

Chip select signal generated from the host address bus. This signal is used to

 

 

 

select one of the two groups of host accessible registers.

- CS1

O

38

Chip select signal generated from the host address bus. This signal is used to

 

 

 

select one of the two groups of host accessible registers.

- DASP

I

39

This is a signal from the drive used either to drive an external LED whenever the

 

 

 

drive is being accessed, or to report presence of the slave drive to the master

 

 

 

when the drive is in master/slave mode.

RESERVED

 

27,44

Reserved for future use. No connection.

+ 3.3V

 

41,42

Power line.

GROUND

 

2,19

Ground between the drive and the host system.

 

 

22,24

 

 

 

26,30

 

 

 

40,43

 

(*1) ‘I’ is from the drive to the host system, ‘O’ is from the host system to the drive, and ‘I/O’ is bi-directional.

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