OMAPL137-HT Datasheet, PDF (254/444 Pages) Texas Instruments – Multimedia Device

OMAP4460
Public Version
SWPS046A – JANUARY 2012
5.5.2.2 DSS—Remote Frame Buffer Interface (RFBI) Applications
5.5.2.2.1 DSS—Remote Frame Buffer Interface (RFBI)—MIPI DBI2.0—LCD Panel
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NOTE
For more information, see the Remote Frame Buffer Interface chapter in the OMAP4460
TRM.
The remote frame buffer interface (RFBI) module is part of the display subsystem that provides the logic to
display a picture from the memory frame buffer (SDRAM or SRAM) on a liquid-crystal display (LCD) panel.
Table 5-32 and Table 5-33 assume testing over the recommended operating conditions and electrical
characteristic conditions below (see Figure 5-51 through Figure 5-53).
Table 5-31. DSS—RFBI Timing Conditions—LCD Panel^(1)(2)(3)
TIMING CONDITION PARAMETER
VALUE
UNIT
MIN
MAX
Input Conditions
t_R
Input signal rise time
t_F
Input signal fall time
PCB Conditions
15
ns
15
ns
Number of external peripherals
1
Far end load
30
pF
Trace length
20
cm
Characteristics impedance
20
50
Ω
(1) IO settings: DS0 = 0.
For more information, see Control Module / Control Module Functional Description / Functional Register Description / Signal Integrity
Parameter Control Registers with Pad Group Assignment / I/O cells with Configurable Output Driver Impedance section of the
OMAP4460 TRM.
(2) In this table the rise and fall times are calculated for 30% to 70% of VDDS. For more information on the corresponding OMAP4 VDDS
power supply name, see Table 2-1, POWER [9] column with the ball name.
(3) To have an idea of the output OMAP4 ball load supported for this application, you can consider the following:
Output OMAP4 ball load = Far End load + 1.34 pF/cm typical x trace length (cm).
Table 5-32. DSS—RFBI Timing Requirements—LCD Panel
NO.
PARAMETER
DR0
DR1
t_{su(dataV-rfbi_rdH)}
t_{h(rfbi_rdH-dataIV)}
Setup time, rfbi_data[n:0]⁽²⁾ valid to rfbi_rd
high
Hold time, rfbi_rd high to rfbi_data[n:0]⁽²⁾
invalid
t_{d(Data sampled)}
rfbi_data are sampled at the end of the access
time
(1) N = (AccessTime) * (TimeParaGranularity + 1) * L3CLK
(2) rfbi_data[n:0], n up to 8
OPP100, OPP119
MIN
MAX
20
5.6
N⁽¹⁾
OPP50
MIN
MAX
20
5.6
N⁽¹⁾
UNIT
ns
ns
ns
Table 5-33. DSS—RFBI Switching Characteristics—LCD Panel
NO.
PARAMETER
t_{w(rfbi_wrH)}
t_{w(rfbi_wrL)}
t_{d(rfbi_a0-rfbi_wrL)}
Pulse duration, rfbi_we high
Pulse duration, rfbi_we low
Delay time, rfbi_a0 transition to rfbi_we low
OPP100, OPP119
MIN
MAX
A⁽¹⁾
B⁽²⁾
C⁽³⁾
OPP50
MIN
MAX
A⁽¹⁾
B⁽²⁾
C⁽³⁾
UNIT
ns
ns
ns
254 Timing Requirements and Switching Characteristics
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