ADE3700 datasheet(40/89 Pages) STMICROELECTRONICS

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Data Measurement (DMEAS)

ADE3700

40/89

2.9.7

DE Size

The DE Size measures the number of INCLKS clock cycles per data enable. It is useful for DVI

inputs to exactly measure the input image horizontal size.

At the end of the measurement (DE falling edge), the measured value is compared to a

programmed expected value ± a programmed threshold. If the expected value is within the

threshold, the DE_size_mismatch flag is not set. If the measured size is outside of the threshold,

the DE_size_mismatch flag is set.

In Free-running mode, the results are updated every line. The DE_size_mismatch flag is set at DE

falling edge and reset at DE rising edge.

In One-shot mode, the results are updated once and stay that way until they are cleared by

software. The DE_size_mismatch flag can only be cleared when the reset flag bit is set by software.

Table 13: DMEAS Output Register Mapping

ALG_SEL = 00

ALG_SEL = 01

ALG_SEL = 10

ALG_SEL = 11

DMEAS_DATA_0

EDGE_OUT[7:0]

MIN_OUT [7:0]

HPOS_MIN [7:0]

DE_SIZE_OUT [7:0]

DMEAS_DATA_1

EDGE_OUT [15:8]

MAX_OUT [7:0]

HPOS_MIN [11:8]

DE_SIZE_OUT [15:8]

DMEAS_DATA_2

EDGE_OUT[23:16]

PCD_OUT [7:0]

HPOS_MAX [7:0]

DE_MISMATCH_FLAG

DMEAS_DATA_3

EDGE_OUT[31:24]

PCD_OUT [15:8]

HPOS_MAX[11:8]

8’h00

DMEAS_DATA_4

PSUM_OUT [7:0]

PCD_OUT [23:16]

VPOS_MIN[7:0]

8’h00

DMEAS_DATA_5

PSUM_OUT[15:8]

8’h00

VPOS_MIN[11:8]

8’h00

DMEAS_DATA_6

PSUM_OUT[23:16]

8’h00

VPOS_MAX[7:0]

8’h00

DMEAS_DATA_7

PSUM_OUT[31:24]

8’h00

VPOS_MAX[11:8]

8’h00

Table 14: Data Measurement Registers (Sheet 1 of 3)

Addr

Mode

Bits

Default

Description

DMEAS_AEC_CTRL

0x0900

[7:6]

0x0

color select

00: all

01: red

10: green

11: blue

R/W

[5]

0x0

vsync edge select

0: rising edge

1: falling edge

R/W

[4]

0x0

hsync edge select

0: rising edge

1: falling edge

R/W

[3]

0x0

interlace mode enable

R/W

[2]

0x0

0: use data valid (tv mode only)

1: use data enable for data valid

R/W

[1:0]

0x0

algorithm select

00 = Edge Intensity & Pixel Sum

01 = Min / Max & PCD

10 = H position and V position

11 = DE size

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