參數(shù)資料
型號: UPD70433R-12
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V55PITM 16-BIT MICROPROCESSOR
中文描述: V55PITM 16位微處理器
文件頁數(shù): 74/166頁
文件大?。?/td> 772K
代理商: UPD70433R-12
74
μ
PD70433
16.2 MEMORY MAP
The data memory areas required by the V55PI's codec instructions are shown below.
(1) Register file space
This is the register bank for parameter setting.
(2) User RAM
Encoding line change point table : Storage area for change point information required for performing encoding
In the case of n bit/lines, a maximum area of 2n + 4 bytes is required.
Reference line table
: Reference line change point information storage area
Image data buffer
: Storage area for pixel data read from scanner in encoding, or encoding data
received from modem in decoding
Transmit/receive buffer
: Buffer for transferring encoded data to modem/scanner
Print buffer
: Buffer for transferring decoded pixel data to recording system
(3) User ROM
Encoding conversion table :
Decoding conversion table :
Conversion table for MH/MR encoding
Conversion table for MH/MR decoding
(4) Access to Expanded Memory Space
The 16-Mbyte expanded memory space can be accessed by using the expanded segment override prefix
instruction (DS2: or DS3:).
However, the segment registers DS2 and DS3 that are used during instruction execution are DS2 and DS3
in the parameter setting register banks of each instruction.
Table 16-1. Instructions to which Expanded Segment Override Prefix Can Be Attached
DS2:
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
DS3:
Yes
No
Yes
No
Yes
No
No
Yes
CODEC Instruction
COLTRP
MHENC
MHDEC
MRENC
MRDEC
SCHEOL
GETBIT
CNVTRP
Example
DS2 : DS3 : COLTRP
DS2 : SCHEOL
The relationship between encoding instructions and data in memory is shown in Figure 16-3, and the relationship between
decoding instruction and data in memory is shown in Figure 16-4.
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