ADE3050SX datasheet(32/88 Pages) STMICROELECTRONICS

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Sync Measurement Block

ADE3XXX

32/88

2.9

Sync Measurement Block

The Input Sync Measurement Block (SMEAS) continuously detects activity from all video sources.

The module can measure the characteristics of the sync signals on any input port. The sync

measurement module reports the results of the measurements to the system microcontroller.

This portion of the sync measurement is fully synchronous on the crystal clock (XCLK). Another

block, the Sync Retiming Block (SRT), handles the asynchronous signal transfer of the incoming

sync signals.

Input Sync Functions:

Activity detection

Sync management

Measurement

Table 13: Sync Measurement Registers (Sheet 1 of 8)

Addr

Mode

Bits

Default

Description

SMEAS_ACT_CTRL

0x0100

[7:4]

0x0

Reserved

R/W

[3]

0x0

Enable activity detection in Free-running

mode.

R/W

[2]

0x0

Freeze results in Free-running mode. No

meaning in One-shot mode.

0: Do not freeze the results. New result will

be available on the next and subsequent

toggle of the polling bit.

1: Freeze the current results. The polling bit

will still toggle and the block continues to free

run; however, results will not be updated.

R/W

[1]

0x0

activity detection start.

In one-shot mode it triggers the start of a

measurement and is reset to zero when the

measurement is complete.

R/W

[0]

0x0

activity detection mode control

0: free run

1: one shot

SMEAS_ACT_H_SMPTM_L

0x0101

R/W

[7:0]

0x0

Sample time value for clock or hsync activity.

In units of XCLK_period*256

SMEAS_ACT_H_SMPTM_H

0x0102

R/W

[7:0]

0x0

SMEAS_ACT_V_SMPTM_L

0x0103

R/W

[7:0]

0x0

Sample time value for vsync activity in units

of XCLK_period*256.

Note: this number MUST be larger than

hsync sample time.

SMEAS_ACT_V_SMPTM_H

0x0104

R/W

[7:0]

0x0

SMEAS_ACT_H_MINEDGE

0x0105

R/W

[7:0]

0x0

Minimum edge count value for clk or hsync

activity.

SMEAS_ACT_V_MINEDGE

0x0106

R/W

[7:0]

0x0

Minimum edge count value for vsync activity.

SMEAS_H_TMOT_L

0x0107

R/W

[7:0]

0x4000

timeout counter value for clk or horizontal

measurement in XCLKs

SMEAS_H_TMOT_H

0x0108

R/W

[7:0]

SMEAS_V_TMOT_L

0x0109

R/W

[7:0]

0x1600

timeout counter value for vertical

measurement in units of XCLK/256

SMEAS_V_TMOT_H

0x010A

R/W

[7:0]

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