
i.MX51 Applications Processors for Consumer and Industrial Products, Rev. 4
92
Freescale Semiconductor
Electrical Characteristics
The maximal accuracy of UP/DOWN edge of controls is
IP5o
Offset of IPP_DISP_CLK
Todicp
DISP_CLK_OFFSET
× Tdiclk
DISP_CLK_OFFSET— offset of
IPP_DISP_CLK edges from local start
point, in DI_CLK
×2
(0.5 DI_CLK Resolution)
Defined by DISP_CLK counter
ns
IP13o Offset of VSYNC
Tovs
VSYNC_OFFSET
× Tdiclk
VSYNC_OFFSET—offset of Vsync edges
from a local start point, when a Vsync
should be active, in DI_CLK
×2
(0.5 DI_CLK Resolution).The
VSYNC_OFFSET should be built by
suitable DI’s counter.
ns
IP8o
Offset of HSYNC
Tohs
HSYNC_OFFSET
× Tdiclk
HSYNC_OFFSET—offset of Hsync edges
from a local start point, when a Hsync
should be active, in DI_CLK
×2
(0.5 DI_CLK Resolution).The
HSYNC_OFFSET should be built by
suitable DI’s counter.
ns
IP9o
Offset of DRDY
Todrdy
DRDY_OFFSET
× Tdiclk
DRDY_OFFSET— offset of DRDY edges
from a suitable local start point, when a
corresponding data has been set on the
bus, in DI_CLK
×2
(0.5 DI_CLK Resolution)
The DRDY_OFFSET should be built by
suitable DI’s counter.
ns
1 Display interface clock period immediate value.
DISP_CLK_PERIOD—number of DI_CLK per one Tdicp. Resolution 1/16 of DI_CLK
DI_CLK_PERIOD—relation of between programing clock frequency and current system clock frequency
Display interface clock period average value.
2 DI’s counter can define offset, period and UP/DOWN characteristic of output signal according to programed parameters of the
counter. Same of parameters in the table are not defined by DI’s registers directly (by name), but can be generated by
corresponding DI’s counter. The SCREEN_WIDTH is an input value for DI’s HSYNC generation counter. The distance
between HSYNCs is a SCREEN_WIDTH.
Table 80. Synchronous Display Interface Timing Characteristics (Pixel Level) (continued)
ID
Parameter
Symbol
Value
Description
Unit
Tdicp
T
diclk
DISP_CLK_PERIOD
DI_CLK_PERIOD
-------------------------------------------------------
×
for integer
DISP_CLK_PERIOD
DI_CLK_PERIOD
-------------------------------------------------------
,
T
diclk
floor
DISP_CLK_PERIOD
DI_CLK_PERIOD
-------------------------------------------------------
0.5
±
+
for fractional
DISP_CLK_PERIOD
DI_CLK_PERIOD
-------------------------------------------------------
,
=
Tdicp
T
diclk
DISP_CLK_PERIOD
DI_CLK_PERIOD
-------------------------------------------------------
×
=
Accuracy
0.5
T
diclk
×
() 0.75ns
±
=