M65762FP

REJ03F0235-0200 Rev.2.00 Sep 14, 2007

Page 2 of 34

Application

• OA equipment including facsimile, copier and printer

• Digital and amusement equipment for the purpose of reducing memory

Block Diagram

48

49

50

51

54

55

56

59

57

58

108

109

110

111

132

135

134

133

112

129

CD0 to 31

CDRQ

CDAK*

CDRD*

CDWR*

RESET*

HCS*

HA0 to 3

HWR*

HRD*

HD0 to 7

INTR

MCLK

(Asterisk "*" indicates negative logic.)

Pixel data

PD0 to 31

PDRQ

PDAK*

PDRD*

PDWR*

PRDY*

PTIM*

PXCK*

PXCKO*

SVID*

RVID*

Description on Block Functions

(1) Host bus I/F block

This bus is used to set command parameters and load the status between the MPU and this block. It is 8-bit bus.

This block is also available to load and store of context table RAM via the host bus.

(2) Code data I/F block

Bus for input/output of coding data. For the bus width, 32 bits, 16 bits or 8 bits can be selected.

Image data can also be transferred (in through mode) between the image data I/F and this block via built-in line

memory. FIFO buffer for 16 bytes are provided in the code data I/F block.

(3) Image data I/F block

The Image data I/F is used for input/output of binary image data. The 32-/16-bit parallel I/F or serial I/F can be

selected. Selection of the serial I/F transfers data in units of 1 pixel in synchronization with the line, using the

handshake signal (PRDY*, PTIM*).

Selection of parallel I/F uses an external DMA controller for DMA transfer (in units of stripe).

The image data I/F provides a function for scale-down of length and breadth by 1/2 in coding and a function for

scale-up of length and breadth by twice in decoding.

(4) Line memory block

4 K-byte memory. This block can be set to a maximum of 8192 pixels/line for 3-line template and can be set to a

maximum of 10240 pixels/line for 2-line template. A line is used for input/output processing of image data to/from

outside and the other lines (2 or 3 lines) are used for encoding/decoding processing. These two processes can be

independently carried out in synchronization with each line.

The contents of line memory can be loaded or stored via the image data I/F or coding data I/F.

(5) Typical prediction block

In the typical prediction mode, compares the encoding/decoding process line agree with the immediately preceding

line and generates pseudo-pixel (SLNTP).