M65762FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M65762FP

QM-CODER

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTOR (LSI)

M65762FP

QM-CODER

(10) Operation mode setting register (W/R)

(Address: B)

d7

d0

MOD_REG: TP LI OB

LIO

MOD

This register is used to set the LSI operation mode and requires to

be set before issuance of the processing start command

(command register d1 (JC) = 1).

d0-1 (MOD) :Operation mode setting (d1 = 0, d0 = 0: Coding, d1 =

1, d0 = 0: Image data through (image data I/F Code

data I/F) load/store, d1 = 0, d0 = 1: Decoding, d1 = 1,

d0 = 1: Image data through (code data I/F Image

data I/F) load/store)

d2- 3 (LIO) :Load/store selection of image data of line memory

(d2 = selection of load, d3 = selection of store)

In the case of multi-stripe, this LIO bit is set according

to the following table, to load image data for

reference line from outside into line memory before

coding/decoding of stripes or to store image data

stored in line memory into outside after

encoding/decoding of stripes. This LIO bit is effective

only in the image data through mode (d1 = 1).

(Notes)

• LIO (d3, d2) = (1, 1) not allowed being set.

• When selection of load/store of image data of line

memory, temporary stop (d3 (JP) = 1 of command

register) is not allowed to be set.

• When load/store mode of image data is selected,

the number of lines to be transferred must be set in

the register setting the number of lines.

• The number of lines for image data load to line

memory must be 2-line either case of 2-line

template or 3-line template.

(This is because typical prediction (LNTP) cannot

be judged correctly with only a line.)

Table 5. Operation Mode List

Operation

mode (d1, d0)

0,0

0,1

1,0

1,1

Load/store

LIO (d3, d2)

X,X

X,X

0,0

0,1

1,0

0,0

0,1

1,0

Operation mode

Coding mode

Decoding mode

Image data through (image data I/F code data I/F)

Image data load to line memory (Input from image data I/F)

Image data store of line memory (output to code data I/F)

Image data through (code data I/F image data I/F)

Image data load to line memory (input from code data I/F)

Image data store of line memory (output to image data I/F)

Remarks

Normal coding mode

Normal decoding mode

For inter-IF transfer of image data

For loading of reference line to LSI

For storing line memory to outside

For inter-I/F transfer of image data

For loading of reference line to LSI

For storing line memory to outside

d4-5 (OB)

d6 (LI)

:Sets head of the coding data read-through at time of

decoding (0 to 3: Sets the number of read-through

bytes. For example, with d4 = 0 and d5 = 1, read-

through of 2 bytes)

When OB is set to 1 to 3 at time of decoding, and the

first stripe decoding processing start command is

issued, the head data for the number of set bytes is

to be read through (not used for decoding process).

With OB set to 0, no data is read through (normal

decoding process).

For example, if the code data bus is 32/16-bits, and

the head of coding data does not contact the word

boundary, this function is used.

(Note)When the code data bus is 8-bits, this function

is effective.

:Prohibition of line memory initialization (0: Indication

of initialization, 1: Prohibition of initialization)

When first stripe coding/decoding process start

command is issued, and LI = 1, initialization of built-in

line memory is prohibited.

(The final image data, coded/decoded just before,

that is left in line memory is used as the reference

line data at the head of next coding/decoding

operation.)With LI = 0, built-in line memory is

initialized.(Full white (0) data is used as the reference

line data at the head of next coding/decoding

operation.)

When the previous stripe is terminated at the

SDNORM marker with coding/decoding of the multi-

stripe configuration, this bit is set to initialization

prohibition (1) to make the data of previous stripe left

in line memory available as the coding reference line

data of the next stripe. (For details, see 4. (6)

Sequence.)

(Note)With LI = 1, this LI bit is cleared (to 0) by H/W

reset writing to an external reset pin or system

setup register. At the same time, built-in line

memory is also initialized.

d7 (TP)

:Selection of typical prediction at time of

coding/decoding (0: Sets typical prediction function

to OFF, 1: Sets typical prediction function to ON.)

This bit is set to 1 when encoding/decoding

process is carried out using the typical prediction

function.

(11) Marker code set up register (W)

d7

d0

(Address: C) MSET_REG:

MSET

d0-7(MSET)

:The End marker code used during coding is set

(SDNORM = 02h, SDRST = 03h, etc.)

The Byte set to this register is output attached to

coding data as the end marker during coding.

(12) Marker code read out register (R)

d7

d0

(Address: C) MDET_REG:

MDET

d0-7(MDET)

:Reads out the marker code detected during

decoding (SDNORM = 02h, SDRST = 03h, ABORT

= 04h, etc.)

Marker code bytes detected at time of decoding

can be read directly.

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