參數(shù)資料
型號: SPAKDSP311VL150
廠商: Freescale Semiconductor
文件頁數(shù): 18/96頁
文件大?。?/td> 0K
描述: IC DSP 24BIT 150MHZ 196-MAPBGA
標準包裝: 2
系列: DSP56K/Symphony
類型: 定點
接口: 主機接口,SSI,SCI
時鐘速率: 150MHz
非易失內(nèi)存: ROM(576 B)
芯片上RAM: 384kB
電壓 - 輸入/輸出: 3.30V
電壓 - 核心: 1.80V
工作溫度: -40°C ~ 100°C
安裝類型: 表面貼裝
封裝/外殼: 196-LBGA
供應商設備封裝: 196-MAPBGA(15x15)
包裝: 托盤
AC Electrical Characteristics
DSP56311 Technical Data, Rev. 8
Freescale Semiconductor
2-5
2.4.2
External Clock Operation
The DSP56311 system clock is derived from the on-chip oscillator or is externally supplied. To use the on-chip
oscillator, connect a crystal and associated resistor/capacitor components to EXTAL and XTAL; examples are
shown in Figure 2-1.
If an externally-supplied square wave voltage source is used, disable the internal oscillator circuit during bootup by
setting XTLD (PCTL Register bit 16 = 1—see the DSP56311 User’s Manual). The external square wave source
connects to EXTAL; XTAL is not physically connected to the board or socket. Figure 2-2 shows the relationship
between the EXTAL input and the internal clock and CLKOUT.
Figure 2-1.
Crystal Oscillator Circuits
Figure 2-2.
External Clock Timing
Suggested Component Values:
fOSC = 4 MHz
R = 680 k
± 10%
C = 56 pF
± 20%
Calculations were done for a 4/20 MHz crystal
with the following parameters:
CLof 30/20 pF,
C0 of 7/6 pF,
series resistance of 100/20
, and
drive level of 2 mW.
XTAL1
C
R
Fundamental Frequency
Crystal Oscillator
XTAL
EXTAL
fOSC = 20 MHz
R = 680 k
± 10%
C = 22 pF
± 20%
Note: Make sure that in
the PCTL Register:
XTLD (bit 16) = 0
If fOSC > 200 kHz,
XTLR (bit 15) = 0
EXTAL
VILX
VIHX
Midpoint
Note:
The midpoint is
0.5 (VIHX + VILX).
ETH
ETL
ETC
CLKOUT with
PLL disabled
CLKOUT with
PLL enabled
7
5
7
6b
5
3
4
2
6a
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