參數(shù)資料
型號(hào)： SAA7715AH
廠商： NXP SEMICONDUCTORS
元件分類： 數(shù)字信號(hào)處理
英文描述： Digital Signal Processor
中文描述： 0-BIT, 24.576 MHz, OTHER DSP, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44
文件頁(yè)數(shù)： 16/36頁(yè)
文件大?。?/td> 167K
代理商： SAA7715AH
2003 Mar 13
16
Philips Semiconductors
Preliminary specification
Digital Signal Processor
SAA7715AH
9.5
Program RAM
The SAA7715AH has a 1.5 kbyte PRAM to store the DSP
instruction code into. Also a 2 kbyte PROM is on-chip
available and can be accessed (memory mapped) without
the need of selecting the PROM or PRAM. The DSP
instruction code can be downloaded into the PRAM via the
I
2
C-bus. The write and read cycle are shown in Figs 5
and 6 respectively.
The DSP has an instruction word width of 32 bits which
means that this space should be accessed with 4 bytes in
consecutive order and does have the auto-increment
function.
9.6
Data word alignment
It is possible to transfer data via the I
2
C-bus to a
destination where it can have different data word length.
Those destinations with data word are shown in Table 7.
Table 7
Data word alignment
SOURCE
DESTINATION
DATA WORD
BYTES
(NUMBER)
I
2
C-bus
I
2
C-bus
I
2
C-bus
I
2
C-bus
I
2
C-bus
DSP-PRAM
DSP and general control
I
2
C-bus registers
DSP-XRAM
DSP-YRAM
MBBB BBBB BBBB BBBB BBBB BBBB BBBB BBBL
MBBB BBBB BBBB BBBB BBBB BBBL
MBBB BBBB BBBB BBBB BBBB BBBL
MBBB BBBB BBBB BBBB BBBB BBBL
XXXX MBBB BBBB BBBL
4
3
3
3
2
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