M65761FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M65761FP

QM-CODER

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (LSI)

M65761FP

QM-CODER

(3) Command Register (W) (address : 2)

d7

CMD_REG :

0

d3

d0

JP RC JC IC

d0 (IC) :This command starts initialization of Context Table RAM (1:start initialization)

When this bit goes 1,the Context Rable RAM initialization starts.This bit returns to 0 automatically when the initialization is

completed.

d1 (JC) :Processing (Coding/Decoding/Through) start /end command (1:start processing, 0:end processing)

When this bit goes 1,processing(coding/decoding/through)starts.

This bit returns to 0 automatically when processing of the number of set lines is finished during the selection of end of

termination.

And if this JC bit is made 0 and inputting the image data is stopped during the coding porocess,the coding is stopped (flushed)

even if the set lines are not filled.Mreover,if this bit made 0 during decoding and no more coded data is coming in,it is

assumed that the '00'of the coded data came in and the preset lines have been processed.However,in case of the multi-

striped coding ,processing should not end by making this bit "0" except in case of last stripe.

d2 (RC) :This command starts and stops R/W of Context Table RAM. (1:R/W start, 0:R/W end)

The Context Table RAM is read out or written in by making this bit to "1".

When reading/writing is finished,this bit must have "0" on it.

d3 (JP) :This selectd temporary stop and the end of termination of coding/decoding/through processing.

(1:Temporary stop selected, 0:End of processing selected)

When the process start command d1(JC)is issued by making this JP bit to 1,the processing stops temporarily when the set

number of lines have been processed. Then, if the process satart command d1(JC) is issued,processing restarts.(See 11.4(3))

(4) Status Register (R) (address : 2)

d7

STAT_REG : 0

d5

d0

PS SC IS MS DS JS

d0 (JS) :This register indicates the status of processing in initialization,coding,decoding and through.

(0:Processing in progress(being initialized),1:End of processing)

This JS bit goes to "1"when the initialization is completed as RAM initialization command is issued.

(IC=1) This JS bit goes to "1"when all coded data has been read out during coding in case when the process start command

of the processing end is issued.(JC=1,JP=0) This JS bit goes to "1" when reading all the image data has been completed

during the image data through and decoding. Moreover,this JS bit stays "0" even when the set number of lines have been

processed when the command to start processing the process which has been stopped temporarily has been issued (JC=1,

JP=1). (However,interrupts are issued during the temporary stops.)

d1 (DS) :This is used for read and write ready of coded data.(In case of the through mode,this is used for the image data.)(1:Ready,

0:Reading no possible)

It is possible to do R/W of data by the way of the data write/read buffer when this bit is 1.

d2 (MS) :This detects the marker code during decoding.(0:not detected, 1:detected)

This bit goes to "1" if any marker is detected during decoding.

d3 (IS) :This indicates the status of the interrupt request.(0:No request, 1:Request exists)

d4(SC) :This shows the SC count over error during coding.(0:Normal, 1:There is a SC counter overflow)

NOTE:The SC counter counts the "FF" data bytes which occur duriing coding.Coding continues even when the SC counter

overflows.this means correct coding data will not be outputted.(Coding error)

d5(PS) :processing modes (Stopped temporary /End of trailer)(1:Process temporaryily stopped, 0:End of processing)

This PS bit corresponds to the temporary stop and end of processing of d3 bit (JP) processing of the command register.

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