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參數(shù)資料
| 型號： | KD16902 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | Virtual Surround Processor(虛擬環(huán)繞處理器) |
| 中文描述： | 虛擬環(huán)繞聲處理器（虛擬環(huán)繞處理器） |
| 文件頁數(shù)： | 33/74頁 |
| 文件大?。?/td> | 327K |
| 代理商： | KD16902 |
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FUNCTIONAL DESCRIPTION
KD16902 VIRTUAL SURROUND PROCESSOR
33
The host sends the following commands and parameters to the KD16902 for downloading and
executing the user written codes.
0x05 ; Select Mode 5, the User Written Program
0x3E ; RAM Address, High
0x03 ;
0x3F ; RAM Address, Low
0x00 ; The first instruction is at 0x0300
0x40 ; RAM Data, High
<upper byte of the first instruction>
0x41 ; RAM Data, Low
<lower byte of the first instruction>
0x3E
0x03
0x3F
0x01 ; The second instruction is at 0x0301
0x40
<upper byte of the second instruction
0x41
<lower byte of the second instruction>
keep download the rest of the user written codes
0x3D ; Program Memory Configuration Command
0x09 ; RAM0_CFG[1:0] - 01 & RAM1_CFG[1:0] - 10
0x42 ; Jump to Program Memory Address, High
0x12
0x43 ; Jump to Program Memory Address, Low
0x00 ; pc <- 0x1200 program address 0x1200 <=> data address 0x0300 in RAM0
Programming Guide
In the KD16902, the input and the output uses separate interrupts. The L/Ls/C and R/Rs/LFE samples are read
from the external registers at different instances of input interrupt. The L/Ls/C samples are read first, followed by
the R/Rs/LFE samples at the next interrupt. Similar to input, the L/Ls/C/Lv and R/Rs/LFE/Rv samples are written to
the external registers at different instances of output interrupt. Here, the Lv and Rv denotes the left and right VCR
outputs, respectively. This makes the input/output interrupt frequency twice the sampling frequency.
The KD16902 requires the user written program to synchronize with the input interrupts. To synchronize properly
with the input interrupts, the user written program must wait until R/Rs/LFE samples are read before proceeding to
the main program. The user written program can use an entry, labeled Flag, in data memory for this purpose. The
input interrupt service routine (ISR) sets this flag to 1 after reading the R/Rs/LFE samples. The user must toggle the
content of Flag back to 0 before proceeding to the main part.
Since the interrupt frequency is larger than the sampling frequency, the interrupt may occur while the user written
program is in running state. The user written program must copy the content of the input buffers to its own working
buffers before proceeding to the main part. Otherwise, the input ISR may change the content of the input buffer and
the user's function may not work properly. Table 28 shows the input buffers which are in page 0 of RAM1. The buff-
ers are listed in the order of ascending address.
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