M65762FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M65762FP

QM-CODER

MITSUBISHI ELECTRIC  

BLOCK DIAGRAM

MITSUBISHI SEMICONDUCTOR (LSI)

M65762FP

QM-CODER

PD0-31

PDRQ 48

PDAK* 49

PDRD* 50

PDWR* 51

PRDY* 54

PTIM* 55

PXCK* 56

PXCKO* 59

SVID* 57

RVID* 58

Pixel data

CD0-31

108 CDRQ

109 CDAK*

110 CDRD*

111 CDWR*

132 RESET*

135 HCS*

HA0-3

134 HWR*

133 HRD*

HD0-7

112 INTR

129 MCLK

(Asterisk "*" indicates negative logic.)

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

4K-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).

(6) Context generator

By using the 10 pixel template of 2-lines or 3-lines.(including

AT pixel) the standard context minimum of JBIG is generated

with the resolution.

(7) Context table RAM block

Corresponds to the 10-bit standard context. This block can

initialize, load and store the context table RAM.

(8) Coding/decoding block

This block performs arithmetic coding and decoding.

It contains a ROM which contains a table capable of

estimating 113 states and is capable of byte stuffing function

('OO' byte insertion/rejection) and is capable of end marker

code control (Marker insertion/detection).

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