M65761FP Просмотр технического описания (PDF) - Renesas Electronics

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производитель

M65761FP

QM-Coder

Renesas Electronics 

M65761FP

(2) Coding/decoding of stripes (no change in the AT pixel position)/image data through processing sequence

2

System set up

(LSI mode set up)

Parameter set up

(Template, context)

Set up number of pixels

d7

d0

SYS_REG: b p x s C m m 0

PARA_REG: c/a l/a t a a a a a

PEL_REG_L:

PEL_REG_H: 0 0

pel_l

pel_h

; mm = Operating mode (Coding/decoding)

; C = Context selection (Internal/external)

; s, x = Bit, byte swap

; p, b = Image data I/F, bit width

; aa,aaaaa = AT pixel position

; t = Template selection

; l = Conditions to take in external context

; c = External context CX0 selects

; pel_l, pel_h = Number of pixels per line

Set up number of lines

LSET_REG_L:

LSET_REG_H:

lset_l

lset_h

; lset_l, lset_h = Number of lines processed

Set up marker code

(Note: coding only)

MSET_REG:

mset

Set up functions

CONV_REG: Tp Li Ob Ho Hr Vr He Ve

Note: Set Li to "0" when it is the leading

stripe of single or multi stripe.

Process start command

(Coding/decoding/through)

CMD_REG: 0 0 0 0 0 0 1 0

; mset = marker code byte set up

(SDNORM = 02h, SDRST = 03h)

; Ve, He = Select expansion during decoding

; Vr, Hr, Ho = Select reduction during coding

; Ob = Select discarding leading 1 byte during decoding

; Tp = ON/OFF of typical prediction function

; Li = Select prohibiting initialization of line memory

; End of trailer processing (Coding/decoding/through)

start command

Set up interrupt enable

IENB_REG: 0 0 0 0 0 0 0 1 ; Processing end interrupt enable

When the external context mode is used, it is not necessary to set the position of AT pixels, number of

pixels, number of lines, and expansion, reduction/typical prediction/line memory initialization selection.

(They will be invalid)

[Coding and decoding are performed during this time]−−−I/O of image data and code data is performed.

(Interrupt is generated)

(Coding and decoding of stripe is performed.)

Interrupt disable is set up

d7

d0

IENB_REG: 0 0 0 0 0 0 0 0 ; Interrupt disable

Status register is read out

(Check end of processing)

STAT_REG: − − − s − rn − j

j=1?

Y

Decoded ?

N

(Error)

N (Coded)

Y (Decoded)

N (Marker not yet detected)

m=1?

(Error)

Y (Marker detected)

s=0?

Y

End

; j = End of processing

; m = Marker detection

; s = SC counter overflow

N (SC counter overflow)

(Error)

Marker code read out

MDET_REG:

mdet

Note: only for decoding

; mdet = marker code read out

End

REJ03F0234-0200 Rev.2.00 Sep 14, 2007

Page 18 of 33

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