Principles
2.2.1.10 Video Interface
The
maps the
into a memory space different from the system memory. The
CPU transmits data from the V-RAM
the system RAM) to the W using the
The
cell converts the image data in the
from parallel to serial, synchronizes it, and
then transmits it to the engine controller board. In other words, the
is a temporary buffer
used to transmit the image data to the engine controller board. This serial image data is called the
VIDEO signal of video interface.
The signal line of the internal video interface
(the
MAIN board and engine controller
board) can be broadly divided into four groups. The first group (PRINT,
RDY, and PRD)
gives the status of either the video controller or engine
and indicates whether they are
ready to communicate with each other or ready to start the printing
operation.
second
group
(TOP,
is the synchronizing signal for the printing operation. The third group (VIDEO) is the
serial video data signal. The fourth group
and
is used to transfer the
commands (from the video controller) or the status (from the engine controller) for printer
mechanism control. Except for VIDEO, PRINT, TOP, and
signals are controlled by
E05A93.
This printer has
and
functions standard. These functions modify the VIDEO
signal with the
2-30
Rev.
