ADE3800XT datasheet(43/138 Pages) STMICROELECTRONICS

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ADE3800

4.8

Sync Multiplexer (SMUX)

The SMUX block provides the ability to:

● Clamp (ADC Black level capture) pulse generation.

● Generate Data Enable from incoming HSync/Vsync signals.

● Select which sync source is used as internal reference.

Vertical enable (venab) and clamp are always generated.

SMEAS_STATUS_RANGE

0152

[7]

The meas_sticky_status bit is an OR of the STATUS_MASK

bits ANDed with their corresponding non-sticky range status

flags. This bit is sticky and can only be cleared by a write to

SMEAS_CLEAR[1]. The sticky bit goes to the scaler as a

signal to blank the output screen.

[6]

Indicates that the hpol measurement does not currently equal

the reference value. Not sticky.

[5]

Indicates that the vpol measurement does not currently equal

the reference value. Not sticky.

[4]

Indicates that the fastmute measurement is currently

exceeding the ref+tol. Not sticky.

[3]

Indicates that the xclks per vhi measurement is currently

exceeding the ref+tol. Not sticky.

[2]

Indicates that the horizontal per vertical measurement is

currently exceeding the ref+tol. Not sticky.

[1]

Indicates that the xclks per horizontal measurement is

currently exceeding the ref+tol. Not sticky.

[0]

Indicates that the xclks per vertical measurement is currently

exceeding the ref+tol. Not sticky.

SMEAS_MEAS_POLLING

0153

[1]

Horizontal measurement polling bit.

Toggles upon completion of each measurement in free-run

mode while SMEAS_H_CTRL[1] = 1. Undefined in one-shot

mode.

[0]

Vertical measurement polling bit.

Toggles upon completion of each measurement in free-run

mode while SMEAS_V_CTRL[1] = 1. Undefined in one-shot

mode.

SMEAS_STATUS_RANGE2

0155

[1]

indicates the current state of the line buffer pointer crossing

error check in the scaler.

[0]

indicates the current state of the output sequencer trigger-

out-of-range error check

a. The Mask can apply in any mode of operation, it does not need to only apply to the Sticky bit setting.

b. Adjust VSYNC delay and/or filtering in the SRT block to achieve an hv_skew >= 6 to prevent vsync jitter

sensitivity in the SMUX and SMEAS blocks.

Table 17: SMEAS Register Definitions (Sheet 6 of 6)

Addr

Mode

Bits

Rst

Description

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