Signals Used For The Engine Interface - Kyocera Mita FS-6750 Service Manual

Signals used for the engine interface

The following signals are used for the engine interface communication. Figure on
next page shows a simplified function diagram of the engine interface and the sig-
nals.
Table 4. 11 Engine interface signals
Signal
SBSYN
SDIR
SCLK
SI
SO
ENGIR
Meaning Active
Status- Low
BuSY-sigNal
Serial line Low
DIRection
Serial CLocK -
Serial Input -
data
Serial Out- -
put data
ENGine High
Interrupt
Request
4-38
Logic controller system
Definition
Determines which direction for the engine system to
transfer the status data. If SBSYN is true, the control-
ler is unable to transfer the command data towards the
engine system. The controller can read in the status
data transferred from the engine system by forwading
SCLK to the engine.
The engine system informs the controller of the direc-
tion of serial communication. If SDIR is high, the con-
troller can transmit command data to the engine
system, and if low, the engine system can transmit sta-
tus data to the controller.
This signal is a clock for synchronization of status data
and command data transmitted between the engine
system and the controller and is output from the con-
troller. The controller reads status data at the leading
edge of SCLK and also outputs command data in syn-
chronization with the trailing edge. Eight pulses of
SCLK are output in a cycle of communication.
This signal is 8-bit command data output from the con-
troller to the engine system and is output in synchroni-
zation with the trailing edge of SCLK. This signal is
enabled only if SDIR is low and SBSYN is high.
This signal is 8-bit status data output from the engine
system to the controller and is output in synchroniza-
tion with the trailing edge of SCLK. This signal is
enabled only if SDIR is high and SBSYN is low.
When the status of the engine system changes and the
controller must be immediately informed of the
change, this signal will become low for certain period
and then return to the high level.
Operation theory
FS-6750