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ICS2008B

ICS2008B Rev D 4/05/05

VITC Read 1 Registers IR10-IR17 (read-only)

These read only registers contain the VITC data as received

from the video line selected in IR30. The frame is stored with

VITC bit 2 in the LSB of IR10 and VITC bit 80 in the MSB of

IR17. Note that a binary 10 sync pattern precedes every eight

data bits of the VITC frame. The 10 sync pattern is not stored.

The CRC is checked by the VITC receiver, and the result is

reported in IR30.

VITC Read 2 Registers IR18-IR1F (read-only)

As with the VITC Read 1 registers, these read only registers

contain the VITC data as received from the video line selected

in IR31. The frame is stored with VITC bit 2 in the LSB of

IR18 and VITC bit 80 in the MSB of IR1F. The result of the

CRC check is reported in IR31.

VITC Write Registers IR20-IR27

These registers contain the data to be output by the VITC

generator. The VITC frame is output with the LSB of IR20 in

VITC bit 2 and the MSB of IR27 in VITC bit 80. Note that the

binary 10 sync pattern which precedes every eight data bits of

the VITC frame is automatically generated by the VITC

generator. The CRC is also automatically generated by the

VITC generator.

BI Window Registers IR28 & 29

The next two registers control the position of the SMPTE

video display, burn-in, window within the video raster. IR28

selects the video column (horizontal position) in which the

burn-in window starts.

IR29 selects the video line which starts the SMPTE video

display window in the video output. When this register is set

to zero, there will be no Burn-In Window displayed in the

video output.

BI Character Registers IR2A-IR2D

These registers contain the character codes used for the

SMPTE time code in the burn-in window which overlays the

source in the video output. An internal character generator

converts the BCD nibbles to display characters.

ITC Write Line Select Registers IR2E & IR2F

VITC code is normally output on two separate video lines in

each field for redundancy. These two registers allow the indi-

vidual line selection & output enables for the two VITC lines.

Write Line – Selects the video line on which the VITC code

will be output. The video line on which the code is output will

be the number in this register plus 10; e.g. writing a one to this

register will cause the code to be output on line 11.

VITC Write Enable – Enables the output of VITC code on the

specified line.

Burn-in Window Column

Column

IR28

Burn-in Window Line

Line (00 - disable)

IR29

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

VITC Write Line 1

Write Line #10-40 (N+10)

Reserved

VITC Write Enable (1-enable)

IR2E

7

6

5

4

3

2

1

0

VITC Write Line 2

Write Line #10-40 (N+10)

Reserved

VITC Write Enable (1-enable)

IR2F

Burn-in Window Registers

7

6

5

4

3

2

1

0

Tens

Ones

E

D

O

CR

E

T

C

A

R

A

H

CE

D

O

CR

E

T

C

A

R

A

H

C

00

8

8

11

9

9

22

A

e

s

U

t

o

N

o

D

33

B

?

44

C

_

55

D

66

E

77

F

k

n

a

l

B