Oki IP-6620 Maintenance Manual page 546

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Image data path
The following diagram shows the image data path.
PCB-ASSY-IPB5-100
USB
USB
PC
R8A66593
(1) USB R8A66593
USB M66590 is a USB interface controller device. It transfers image data to ATG via the
bus dedicated to DMA.
(2) ATG
FPGA-ATG is a FPGA that controls the band memory. It has functions to transfer the
image data as shown below:
- from R8A66593 to BM
- from BM to RSM
Only linear order processing is supported for image data transfer from a computer.
(3) RSM
RSM is an FPGA responsible for horizontal/vertical conversion, masking, and adding
white data. It processes image data transferred from the ATG, masks it using data read
from the mask memory, and transfers the image data to PTG.
(4) PTG
PTG is an FPGA that receives image data sent from RSM, and transfers it to each head.
It has 16 FIFO inputs for each row and each head. After reading data from FIFO, PTG
shifts the data in each head via an independent circuit. The shift-in direction is different
between the row A and the row B of each head.
(5) Head
The head drives the actuator of each nozzle based on the shift-in image data.
MASK
BM
Memory
256MB
32 16
ATG 8 RSM
16
Figure 8.7 Image data path
OKI Data Infotech Corporation CONFIDENTIAL
Chapter 8 Operation Mechanism
PCB-ASSY-HCB1M
PTG
16
HEAD
x7 or x6
8-25