- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98145 > ST7267C8T1/XXX (STMICROELECTRONICS) 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP48 PDF資料下載
參數(shù)資料
| 型號(hào)： | ST7267C8T1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, LEAD FREE, TQFP-48 |
| 文件頁數(shù)： | 58/189頁 |
| 文件大?。?/td> | 1643K |
| 代理商： | ST7267C8T1/XXX |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁當(dāng)前第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁
ST7267C8 ST7267R8
150/189
MSCI PARALLEL INTERFACE (Cont’d)
17.8 REED SOLOMON DECODER
The Reed Solomon decoder is a hardware system
that can detect and correct 4 erroneous bytes in a
512-byte data packet received (or sent) by the par-
allel interface. It must receive packets made of 520
10-bit symbols (512 data symbols followed by 8
parity symbols). See Figure 67
The data symbols are provided to the decoder by
the parallel interface when the decoder is enabled.
They are converted to 10 bit by adding 2 most sig-
nificant bits and forcing them to 0. The parity sym-
bols must be sent to the decoder through a dedi-
cated input FIFO. This FIFO makes the conversion
from 16-bit words to 10-bit words for the parity
symbols.
After receiving a complete packet of 520 symbols,
the Reed Solomon decoder automatically starts its
algorithm. After a few cycles it is able to indicate
whether the packet is corrupted with the "errors"
and "errors_valid" flags. If the packet contains er-
rors, the correction algorithm is automatically start-
ed. After approximately 20 MSCI cycles (depends
on the error) the Reed Solomon is ready to output
512-byte corrected data packed. Data output of
the decoder can be read through a dedicated out-
put FIFO. See Figure 68
The Input FIFO can be filled at any time by the
MSCI core. When the RS decoder has received all
the data bytes, the MSCI program must send the
redundant symbols to the decoder. To do this the
MSCI software must write 1 in the "Feed Decoder"
bit of the RSCSR register. This sends the content
of the input FIFO in 10-bit format to the decoder.
The redundancy words must be sent in the
same order and with the same byte ordering as
they were read from the encoder output!
The output FIFO is automatically filled by the de-
coder when the errors are corrected (this only hap-
pens if an error was detected). The MSCI software
can recover the 512-byte data packet from this
output FIFO by series of eight 16-bit words.
Note: the same register is used to access input
FIFO and output FIFO of the RS decoder. Writing
into this register store data in the input FIFO, read-
ing this register returns data from the output FIFO.
Figure 67. Reed Solomon 520-symbol frame.
Figure 68. Reed Solomon decoder implementation (When RS decoder enable = 1)
symbols
8 parity
520 symbols
2 MSB of
data symbols
forced to 0
10 bits
512 data bytes
Word 7
Word 6
Word 5
Word 4
Word 3
Word 2
Word 1
Word 0
COM. BUFFER (0 or 1)
word/byte
conversion
ECC swap bytes
RS decoder
Input or Output
mode
previous data word
Status flags
received from I/Os
Decoder output FIFO
(8*16-bit)
Decoder input FIFO
(5*16-bit)
MSCI
16-b
it
B
U
S
512byte
RS decoder
RAM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72774S9T1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST72E734J6D0 | 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP42 |
| ST72T774S9T1 | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST7294C6B6 | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP28 |
| ST72T94C6M6 | 8-BIT, OTPROM, MICROCONTROLLER, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72681/R12 | 制造商:STMicroelectronics 功能描述:CONTROLLER FOR HIGH-PERFORMANCE BUS-POWERED USB 2.0 FLASH DR - Trays |
| ST72681/S13 | 制造商:STMicroelectronics 功能描述:CONTROLLER FOR HIGH-PERFORMANCE - Trays |
| ST7271 | 制造商:Panasonic Industrial Company 功能描述:IC |
| ST7271N5B1-CLF | 制造商:STMicroelectronics 功能描述: |
| ST727X4-EMU2B | 制造商:STMicroelectronics 功能描述:REALTIME EMULATOR BOARD - Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。