DLPC3470 datasheet(23/70 Pages) TI1

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VSYNC_WE

HSYNC_CS

DATAEN_CMD

tp_vsw

1 Frame

tp_vbp

tp_vfp

HSYNC_CS

DATAEN_CMD

tp_hsw

1 Line

tp_hfp

tp_hbp

PDATA(23/15:0)

PCLK

n-2

n-1

(This diagram assumes the VSYNC

active edge is the rising edge)

(This diagram assumes the HSYNC

active edge is the rising edge)

DLPC3470

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DLPS110 – APRIL 2018

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(1)

The minimum total vertical blanking is defined by the following equation: tp_tvb(min) = 6 + [6 × Max(1, Source_ALPF/ DMD_ALPF)] lines

where:

(a) SOURCE_ALPF = Input source active lines per frame

(b) DMD_ALPF = Actual DMD used lines per frame supported

(2)

Total horizontal blanking is driven by the max line rate for a given source which will be a function of resolution and orientation. The

following equation can be applied for this: tp_thb = Roundup[(1000 × ƒclock)/ LR] – APPL

where:

(a) ƒclock = Pixel clock rate in MHz

(b) LR = Line rate in kHz

(d) If tp_thb is calculated to be less than tp_hbp + tp_hfp then the pixel clock rate is too low or the line rate is too high, and one or both

must be adjusted.

6.12 Parallel Interface Frame Timing Requirements

MIN

MAX

UNIT

tp_vsw

Pulse duration – VSYNC_WE high

50% reference points

lines

tp_vbp

Vertical back porch (VBP) – time from the leading edge of

VSYNC_WE to the leading edge HSYNC_CS for the first active

line (see (1))

50% reference points

lines

tp_vfp

Vertical front porch (VFP) – time from the leading edge of the

HSYNC_CS following the last active line in a frame to the

leading edge of VSYNC_WE (see (1))

50% reference points

lines

tp_tvb

Total vertical blanking – time from the leading edge of

HSYNC_CS following the last active line of one frame to the

leading edge of HSYNC_CS for the first active line in the next

frame. (This is equal to the sum of VBP (tp_vbp) + VFP (tp_vfp).)

50% reference points

See (1)

lines

tp_hsw

Pulse duration – HSYNC_CS high

50% reference points

128

PCLKs

tp_hbp

Horizontal back porch – time from rising edge of HSYNC_CS

to rising edge of DATAEN_CMD

50% reference points

PCLKs

tp_hfp

Horizontal front porch – time from falling edge of

DATAEN_CMD to rising edge of HSYNC_CS

50% reference points

PCLKs

tp_thb

Total horizontal blanking – sum of horizontal front and back

porches

50% reference points

See (2)

PCLKs

Figure 4. Parallel Interface Frame Timing

DLPC3470 Datasheet(PDF) 23 Page - Texas Instruments

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