Texas Instruments TVP5147M1PFP Status Request Register, Vertical Line Count Register, 2.11.63

Models: TVP5147M1PFP

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2.11.63

Functional Description

2.11.63

Status Request Register

 

 

 

 

 

Subaddress

 

 

97h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Default

 

 

00h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

6

 

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

Capture

Capture:

Setting a 1b in this register causes the internal processor to capture the current settings of the AGC status and the vertical line count registers. Since this capture is not immediate, it is necessary to check for completion of the capture by reading the capture bit repeatedly after setting it and waiting for it to be cleared by the internal processor. Once the capture bit is 0b, the AGC status and vertical line counters (3Ch/3Dh and 9Ah/9Bh) have been updated and can be safely read in any order.

2.11.64 Vertical Line Count Register

Subaddress

9Ah

9Bh

Read only

Subaddress

7

6

5

 

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

9Ah

 

 

 

 

Vertical line [7:0]

 

 

 

 

 

 

 

 

 

 

 

9Bh

 

 

Reserved

 

 

 

Vertical line [9:8]

Vertical line [9:0] represents the detected a total number of lines from the previous frame. This can be used with nonstandard video signals such as a VCR in trick mode to synchronize downstream video circuitry.

Since this register is a double-byte register, it is necessary to capture the setting into the register to ensure that the value is not updated between reading the lower and upper bytes. In order to cause this register to capture the current settings, bit 0 of the status request register (subaddress 97h) must be set to a 1b. Once the internal processor has updated and can be read. Either byte may be read first since no further update will occur until bit 0 of 97h is set to 1b again.

2.11.65 AGC Decrement Delay Register

Subaddress

9Eh

 

 

Default

00h

7

6

5

4

3

2

1

0

AGC decrement delay [7:0]

AGC decrement delay [7:0]: Number of frames to delay gain decrements

1111 1111 = 255

0001 1110 = 30 (default)

0000 0000 = 0

60

TVP5147M1PFP

SLES140A—March 2007

Page 68
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Texas Instruments TVP5147M1PFP manual Status Request Register, Vertical Line Count Register, AGC Decrement Delay Register