AD9980PCB datasheet(36/44 Pages) AD

36 / 44 page

AD9980

Preliminary Technical Data

Rev. 0 | Page 36 of 44

DETECTION STATUS

0x24

Hsync0 Detection Bit

This bit is used to indicate when activity is detected on

the HSYNC0 input pin. If Hsync is held high or low,

activity will not be detected. The sync processing

block diagram shows where this function is imple-

mented. 0 = Hsync0 is not active. 1 = Hsync0 is active.

Table 60. Hsync0 Detection Results

Detect

Result

No activity detected

Activity detected

0x24

Hsync1 Detection Bit

This bit is used to indicate when activity is detected on

the HSYNC1 input pin. If Hsync is held high or low,

activity is not detected. The sync processing block

diagram shows where this function is implemented.

0 = Hsync1 is not active. 1 = Hsync1 is active.

Table 61. Hsync1 Detection Results

Detect

Result

No activity detected

Activity detected

0x24

Vsync0 Detection Bit

This bit is used to indicate when activity is detected on

the VSYNC0 input pin. If Vsync is held high or low,

activity is not detected. The sync processing block

diagram shows where this function is implemented.

0 = Vsync0 not active. 1 = Vsync0 is active.

Table 62. Vsync0 Detection Results

Detect

Result

No activity detected

Activity detected

0x24

Vsync1 Detection Bit

This bit is used to indicate when activity is detected on

the Vsync1 input pin. If Vsync is held high or low,

activity is not detected. The sync processing block

diagram shows where this function is implemented.

0 = Vsync1 is not active, 1 = Vsync1 is active.

Table 63. Vsync1 Detection Results

Detect

Result

No activity detected

Activity detected

0x24

SOG0 Detection Bit

This bit is used to indicate when activity is detected on

the SOG0 input pin. If SOG is held high or low,

activity is not detected. The sync processing block

diagram shows where this function is implemented.

0 = SOG0 is not active. 1 = SOG1 is active.

Table 64. SOG0 Detection Results

Detect

Result

No activity detected

Activity detected

0x24

SOG1 Detection Bit

This bit is used to indicate when activity is detected on

the SOG1 input pin. If SOG is held high or low,

activity is not detected. The sync processing block

diagram shows where this function is implemented.

0 = SOG1 not active. 1 = SOG1 is active.

Table 65. SOG1 Detection Results

Detect

Result

No activity detected

Activity detected

0x24

Coast Detection Bit

This bit detects activity on the EXTCLK/EXTCOAST

pin. It indicates one of the two signals is active, but it

won’t indicate if it is EXTCLK or EXTCOAST. A dc

signal is not detected.

Table 66. COAST Detection Result

Detect

Result

No activity detected

Activity detected

0x24

Clamp Detection Bit

This bit is used to indicate when activity is detected on

the external clamp pin. If external clamp is held high

or low, activity is not detected.

Table 67. Clamp Detection Results

Detect

Result

No activity detected

Activity detected

POLARITY STATUS

0x25

Hsync0 Polarity

Indicates the polarity of Hsync0 input.

Table 68. Detected Hsync0 Polarity Results

Detect

Result

Hsync polarity is negative

Hsync polarity is positive

0x25

Hsync1 Polarity

Indicates the polarity of Hsync1 input.

Table 69. Detected Hsync1 Polarity Results

Detect

Result

Hsync polarity is negative

Hsync polarity is positive

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