M65762FP Datasheet, PDF (15/35 Pages) Mitsubishi Electric Semiconductor – QM-CODER(purpose of reducing)

M65762FP
(10) Operation mode setting register (W/R)
(Address: B)
d7
MOD_REG:
TP
LI
OB
d0
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: 1. LIO (d3, d2) = (1, 1) not allowed being set.
2. 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.
3. 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.
4. 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)
XX
XX
00
01
10
00
01
10
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-I/F 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):
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.
REJ03F0235-0200 Rev.2.00 Sep 14, 2007
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