M65762FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M65762FP

QM-CODER

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTOR (LSI)

M65762FP

QM-CODER

(6) Total sequence of multi-stripe coding/decoding

For an image with a page consisting of more than one stripe or

plane, coding or decoding process must be carried out in units

of stripe after initialization.

Multi-stripe

coding/decoding

Initialization of built-in memory

and context table RAM

[Process (1)]

1st stripe coding/decoding

processing

[process (2) or (3)]

Y

End of processing

of all stripes?

N

End of page

(Note 1)

Since use of the host bus with 32/16-bit bus during coding adopts word

boundary, the end marker code may be followed by the pad bytes ('00')

of 1 to 3-byte. These pad bytes must be removed outside. (See

Section 2. (7).)

(Note 2)

When decoding of stripes starts at time of decoding, the head coding

data of SDE (stripe data entity) must be first entered. Read-through of

head byte is indicated, if necessary. (At time of end of decoding

stripes, the head block of coding data may be entered into LSI (FIFO)

or may not be arranged in the word boundary. Management is

therefore required outside.)

(Note 3)

The process of inter-stripe marker codes (ATMOVE, NEWLEN, etc.)

(insert at time of coding and detection/removal at time of decoding)

must be carried out outside.

Is previous stripe

SDNORM?

[case1]

N (SDRST)

Y (SDNORM)

Y(Same plane)

Initialization of line memory and

context table RAM

[Process (1)]

[case2]

Does the same plane

stripe continue?

N (Difference plane)

[case3]

Loading of image data of line

memory, and loading of context

table RAM

[Processes (4) and (5)]

Stripe coding/decoding

processing (Indication of line

memory initialization: Li = 0, AT

pixel = Default position (0))

[Process (2) or (3)]

Stripe coding/decoding

processing (Prohibition of line

memory initialization: Li = 1, AT

pixel = Previous stripe taken

over)

[Process (2) or (3)]

Stripe coding/decoding

processing

(Prohibition of line memory

initialization: Li = 1, AT pixel =

Respecify)

[Process (2) or (3)]

Storing of image data of line

memory and storing of context

table RAM

[Processes (4) and (5)]

(Description)

If the end marker of the previous stripe is SDRST, the status must be

initialized for coding/decoding the next stripe. Start to carry out the

process of next stripe by returning the AT pixel position to the default

position after the initialization of built-in line memory and context table

RAM. [case 1]

If the termination marker of the previous stripe is SDNORM, the status

of the previous stripe must be taken over for coding/decoding the next

stripe. If the stripe of the same plane is continuously coded/decoded,

the AT pixel position takes over the final value of the previous stripe

and the process of the next stripe is to start without initializing line

memory and context table RAM to use the status of line memory

and context table RAM at the end of previous stripe for the next

stripe. [case 2]

On the other hand, since the status at the end of pre-stripe status

of the same plane must be respecified for the status of line memory

and context table RAM, line memory and context table RAM are to

be loaded into LSI to respecify the AT pixel position and to start

processing the next stripe when alternately coding/decoding stripes

of different planes. After coding/decoding of stripe, save line

memory and context table RAM for next stripe. [case 3]

(Example)

• Single plane, multi-stripe

• Multiple planes and multi-stripe

Plane

1

2

3

4

Plane 1

Plane 2

Stripe

Plane 3

(Processes in numeric order)

1

4

7

10

2

5

8

11

3

6

9

12

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