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參數資料
型號: ADSP-21364SKSQ-ENG
廠商: ANALOG DEVICES INC
元件分類: 數字信號處理
英文描述: SHARC Processor
中文描述: 16-BIT, 55.55 MHz, OTHER DSP, PQFP144
封裝: MS-026BFB-HD, HSLQFP-144
文件頁數: 19/52頁
文件大小: 853K
代理商: ADSP-21364SKSQ-ENG
ADSP-21364
Preliminary Technical Data
Rev. PrB
|
Page 19 of 52
|
September 2004
Clock Input
Clock Signals
The ADSP-21364 can use an external clock or a crystal. See
CLKIN pin description. The programmer can configure the
ADSP-21364 to use its internal clock generator by connecting
the necessary components to CLKIN and XTAL.
Figure 8
shows
the component connections used for a crystal operating in fun-
damental mode. Note that the clock rate is achieved using a
16.67 MHz crystal and a PLL multiplier ratio 16:1
(CCLK:CLKIN achieves a clock speed of 266 MHz). To achieve
the full core clock rate, programs need to configure the multi-
plier bits in the PMCTL register.
Table 11. Clock Input
Parameter
333 MHz
Unit
Min
Max
Timing Requirements
t
CK
t
CKL
t
CKH
t
CKRF
t
CCLK
3
CLKIN Period
CLKIN Width Low
CLKIN Width High
CLKIN Rise/Fall (0.4V–2.0V)
CCLK Period
18
1
7.5
1
7.5
1
3.0
1
1
Applies only for CLKCFG1–0 = 00 and default values for PLL control bits in PMCTL.
2
Applies only for CLKCFG1–0 = 01 and default values for PLL control bits in PMCTL.
3
Any changes to PLL control bits in the PMCTL register must meet core clock timing specification t
CCLK
.
TBD
2
TBD
2
TBD
2
TBD
TBD
ns
ns
ns
ns
ns
Figure 7. Clock Input
CLKIN
t
CK
t
CKH
t
CKL
Figure 8. 333 MHz Operation (Fundamental Mode Crystal)
CLKIN
XTAL
C1
C2
X1
NOTE: C1 AND C2 ARE SPECIFIC TO CRYSTAL SPECIFIED FOR X1.
CONTACT CRYSTAL MANUFACTURER FOR DETAILS. CRYSTAL
SELECTION MUST COMPLY WITH CLKCFG1-0 = 10 OR = 01.
1M
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