OMAP4460 Datasheet, PDF (191/444 Pages) Texas Instruments – Multimedia Device

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OMAP4460
www.ti.com
SWPS046A – JANUARY 2012
4.2 Output Clocks Specifications
4.2.1 FREF Output Clocks
Each output clock source can be selected independently between the system clock (fref_xtal_in,
fref_slicer_in), PER DPLL or CORE DPLL, with a programmable divider factor.
For more information, see the Power, Reset and Clock Management / PRCM Subsystem Environment /
External Clock Signals section of the OMAP4460 TRM.
Table 4-11 summarizes the electrical characteristics of the fref_clk1_out output clock (specially targeted
for the primary camera sensor functional input clock), fref_clk2_out output clock (targeted for the
secondary camera sensor functional input clock), and fref_clk0_out, fref_clk3_out, fref_clk4_out,
fref_clk5_out output clocks (input clocks for the other peripherals).
Table 4-11. fref_clkx_out Output Clock Electrical Characteristics⁽¹⁾⁽³⁾
NAME
f
DESCRIPTION
Frequency, fref_clkx_out
MIN
TYP
MAX
fref_xtal_in clock frequency⁽²⁾ or fref_slicer_in clock
frequency⁽²⁾ or PER/CORE DPLL frequency⁽²⁾
MB[0:1] = 11
LB0 = 1
C_L
Load capacitance (Transmission line load + Far
20
25
end load)
Z_T
Transmission line impedance
30
60
L_T
Transmission line length
NA
10
D_T
Transmission line delay time
NA
670
LB0 = 0
C_L
Load capacitance (Transmission line load + Far
14
17
end load)
Z_T
Transmission line impedance
30
60
L_T
Transmission line length
NA
5
D_T
Transmission line delay time
NA
335
MB[0:1] = 01
LB0 = 1
C_L
Load capacitance (Transmission line load + Far
23
28
end load)
Z_T
Transmission line impedance
30
55
L_T
Transmission line length
NA
12.5
D_T
Transmission line delay time
NA
838
LB0 = 0
C_L
Load capacitance (Transmission line load + Far
2
11
end load)
Z_T
Transmission line impedance
30
60
L_T
Transmission line length
NA
8
D_T
Transmission line delay time
NA
536
(1) In fref_clkx_out, x = 0, 1, 2, 3, 4, or 5
(2) Possible clock divisions: [1 to 16]
(3) The modes are configured by 3 bits MB[0:1] and LB0 of the IO cell. For more details, see the OMAP4460 TRM.
UNIT
MHz
pF
Ω
cm
ps
pF
Ω
cm
ps
pF
Ω
cm
ps
pF
Ω
cm
ps
Table 4-12 details the fref_clk0_out, fref_clk1_out, fref_clk2_out, fref_clk3_out, fref_clk4_out, and
fref_clk5_out output clock switching characteristics.
Copyright © 2012, Texas Instruments Incorporated
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Clock Specifications 191