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5.1 Physical Interface
C141-E042-01EN 5-5
[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.