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AM1707BZKBD3 Fiches technique(PDF) 44 Page - Texas Instruments

No de pièce AM1707BZKBD3
Description  AM1705 ARM Microprocessor
Download  155 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

AM1707BZKBD3 Fiches technique(HTML) 44 Page - Texas Instruments

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PLLDIV1 (/1)
SYSCLK1
PLLDIV2 (/2)
SYSCLK2
PLLDIV3 (/3)
SYSCLK3
PLLDIV4 (/4)
SYSCLK4
PLLDIV5 (/3)
SYSCLK5
PLLDIV7 (/6)
SYSCLK7
DIV4.5
1
0
EMIFA
Internal
Clock
Source
CFGCHIP3[EMA_CLKSRC]
DIV4.5
EMIFB
Internal
Clock
Source
CFGCHIP3[EMB_CLKSRC]
1
0
Pre-Div
PLLM
PLLEN
AUXCLK
0
1
PLL
Post-Div
CLKMODE
1
0
Square
Wave
Crystal
OSCIN
2000 N
Max PLL Lock Time =
m
where N = Pre-Divider Ratio
M = PLL Multiplier
AM1705
SPRS657A – FEBRUARY 2010 – REVISED APRIL 2010
www.ti.com
Figure 6-9. PLL Topology
Table 6-5. Allowed PLL Operating Conditions
Default
No.
PARAMETER
MIN
MAX
UNIT
Value
PLLRST: Assertion time during
1
N/A
1000
N/A
ns
initialization
Lock time: The time that the application
has to wait for the PLL to acquire locks
OSCIN
2
N/A
N/A
before setting PLLEN, after changing
cycles
PREDIV, PLLM, or OSCIN
(1)
3
PREDIV
/1
/1
/32
ns
PLL input frequency
4
12
50
MHz
( PLLREF)
5
PLL multiplier values (PLLM) (1)
x20
x4
x32
6
PLL output frequency. ( PLLOUT )
N/A
400
600(2)
MHz
7
POSTDIV
/1
/2(2)
/32
ns
(1)
The multiplier values must be chosen such that the PLL output frequency (at PLLOUT) is between 400 and 600 MHz, but the frequency
going into the SYSCLK dividers (after the post divider) cannot exceed 300 MHz. The Post Divider and SYSCLK divider values must be
chosen such that the CPU clocks do not exceed 300 MHz.
(2)
PLL post divider / 2 must be used. The /4.5 clock path can be used to generate an EMIF clock from the undivided (i.e. 600 MHz) PLL
output clock.
44
Peripheral Information and Electrical Specifications
Copyright © 2010, Texas Instruments Incorporated
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Product Folder Link(s): AM1705


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