Texas Instruments 180 to 100 Pin DIMM Adapter TMDSADAP180TO100 TMDSADAP180TO100 Datenbogen
Produktcode
TMDSADAP180TO100
MAIN
OSC
INTEGER
MULTIPLIER
FRACTIONAL
MULTIPLIER
PIN
X1
UPLLMULT REG
/4
USB PLL
000000 : x 1
000001 : x 1
000010 : x 2
000011 : x 3
000001 : x 1
000010 : x 2
000011 : x 3
.
.
.
111101: x 61
111110: x 62
111111: x 63
111111: x 63
EXAMPLE 1:
X1 OR XCLKIN = 60 MHZ
UPLLIMULT = 000000 ( BYPASS PLL)
N/A
PLLSYSCLK = 60 MHz
EXAMPLE 2:
X1 OR XCLKIN = 10 MHz
UPLLIMULT = 011000 ( x 24 )
UPLLFMULT = 00 ( NOT USED)
PLLSYSCLK = ( 10 x 24)
/ 4 = 60 MHz
EXAMPLE 3:
X1 OR XCLKIN = 64 MHz
UPLLIMULT = 000011 ( x 3)
UPLLFMULT = 11 ( x 0.75)
PLLSYSCLK = ( 64 x 3.75 )
/ 4 = 60 MHz
UPLLIMULT
UPLLFMULT
0
1
USBPLLCLK
OUPUT OF
THE USB PLL
IS ALWAYS
DIVIDED BY 4
THE USB PLL
IS ALWAYS
DIVIDED BY 4
00: NOT USED
01:
x 0.25
10:
x 0.50
11:
x 0.75
6
2
OSCCLK
(1) OUPUT OF THE USB PLL MUST BE ALWAYS 240MHz ( SO THAT USBPLLCLK IS 60MHZ )
PIN
XCLKIN
XCLKIN
PLLINP
UPLLCLKSRC
0
1
UPLLCTL REG
UPLLCLKEN
UPLLEN
(2)
(2) WHEN UPLLEN BIT = 0, THE USB PLL IS POWERED OFF
SPRS825C – OCTOBER 2012 – REVISED FEBRUARY 2014
Figure 3-9. USB PLL
52
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