Fujitsu MHA2021AT, MHA2032AT manual Pidag, Dasp

		5.1 Physical Interface
[signal]	[I/O]	[Description]
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.
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.
IORDY	O	This signal requests the host system to delay the transfer cycle
		when the device is not ready to respond to a data transfer request
		from the host system.
CSEL	I	This signal to configure the device as a master or a slave device.
		When CSEL signal is grounded,, the IDD is a master device.
		When CSEL signal is open,, the IDD is a slave device.
		This signal is pulled up with 240 kΩ resistor.
DMACK-	I	The host system asserts this signal as a response that the host
		system receive data or to indicate that data is valid.
DMARQ	O	This signal is used for DMA transfer between the host system and
		the device. The device asserts this signal when the device
		completes the preparation of DMA data transfer to the host
		system (at reading) or from the host system (at writing).
		The direction of data transfer is controlled by the IOR and IOW
		signals. This signal hand shakes with the DMACK-signal. In
		other words, the device negates the DMARQ signal after the host
		system asserts the DMACK signal. When there is other data to be
		transferred, the device asserts the DMARQ signal again.
		When the DMA data transfer is performed, IOCS16-, CS0- and
		CS1- signals are not asserted. The DMA data transfer is a 16-bit
		data transfer.
+5 VDC	I	+5 VDC power supplying to the device.
GND	-	Grounded

Note:

“I” indicates input signal from the host to the device.

“O” indicates output signal from the device to the host.

“I/O” indicates common output or bi-directional signal between the host and the device.

C141-E042-01EN 5-5