ADV7344 datasheet(69/88 Pages) AD

69 / 88 page

ADV7344

Rev. 0 | Page 69 of 88

APPENDIX 1—COPY GENERATION MANAGEMENT SYSTEM

SD CGMS

Subaddress 0x99 to Subaddress 0x9B

The ADV7344 supports copy generation management system

(CGMS) conforming to the EIAJ CPR-1204 and ARIB TR-B15

standards. CGMS data is transmitted on Line 20 of the odd fields

and Line 283 of even fields. Subaddress 0x99, Bits[6:5] control

whether CGMS data is output on odd or even fields or both.

SD CGMS data can only be transmitted when the ADV7344

is configured in NTSC mode. The CGMS data is 20 bits long.

The CGMS data is preceded by a reference pulse of the same

amplitude and duration as a CGMS bit (see Figure 91).

ED CGMS

Subaddress 0x41 to Subaddress 0x43

Subaddress 0x5E to Subaddress 0x6E

525p

The ADV7344 supports copy generation management system

(CGMS) in 525p mode in accordance with EIAJ CPR-1204-1.

When ED CGMS is enabled (Subaddress 0x32, Bit 6 = 1), 525p

CGMS data is inserted on Line 41. The 525p CGMS data

registers are at Subaddress 0x41, Subaddress 0x42, and

Subaddress 0x43.

The ADV7344 also supports CGMS Type B packets in 525p

mode in accordance with CEA-805-A.

When ED CGMS Type B is enabled (Subaddress 0x5E, Bit 0 = 1),

525p CGMS Type B data is inserted on Line 40. The 525p CGMS

Type B data registers are at Subaddress 0x5E to Subaddress 0x6E.

625p

The ADV7344 supports copy generation management system

(CGMS) in 625p mode in accordance with IEC 62375 (2004).

When ED CGMS is enabled (Subaddress 0x32, Bit 6 = 1), 625p

CGMS data is inserted on Line 43. The 625p CGMS data

registers are at Subaddress 0x42 and Subaddress 0x43.

HD CGMS

Subaddress 0x41 to Subaddress 0x43

Subaddress 0x5E to Subaddress 0x6E

The ADV7344 supports copy generation management system

(CGMS) in HD mode (720p and 1080i) in accordance with

EIAJ CPR-1204-2.

When HD CGMS is enabled (Subaddress 0x32, Bit 6 = 1), 720p

CGMS data is applied to Line 24 of the luminance vertical

blanking interval.

When HD CGMS is enabled (Subaddress 0x32, Bit 6 = 1), 1080i

CGMS data is applied to Line 19 and Line 582 of the luminance

vertical blanking interval.

The HD CGMS data registers are at Subaddress 0x41,

Subaddress 0x42, and Subaddress 0x43.

The ADV7344 also supports CGMS Type B packets in HD

mode (720p and 1080i) in accordance with CEA-805-A.

When HD CGMS Type B is enabled (Subaddress 0x5E, Bit 0 = 1),

720p CGMS data is applied to Line 23 of the luminance vertical

blanking interval.

When HD CGMS Type B is enabled (Subaddress 0x5E, Bit 0 = 1),

1080i CGMS data is applied to Line 18 and Line 581 of the

luminance vertical blanking interval.

The HD CGMS Type B data registers are at Subaddress 0x5E to

Subaddress 0x6E.

CGMS CRC FUNCTIONALITY

If SD CGMS CRC (Subaddress 0x99, Bit 4) or ED/HD CGMS

CRC (Subaddress 0x32, Bit 7) is enabled, the upper six CGMS

data bits, C19 to C14, which comprise the 6-bit CRC check

sequence, are automatically calculated on the ADV7344. This

calculation is based on the lower 14 bits (C13 to C0) of the data

in the CGMS data registers, and the result is output with the

remaining 14 bits to form the complete 20 bits of the CGMS

data. The calculation of the CRC sequence is based on the

polynomial x6 + x + 1 with a preset value of 111111.

If SD CGMS CRC or ED/HD CGMS CRC are disabled, all

20 bits (C19 to C0) are output directly from the CGMS registers

(CRC must be calculated by the user manually).

If ED/HD CGMS Type B CRC (Subaddress 0x5E, Bit 1) is

enabled, the upper six CGMS Type B data bits (P122 to P127)

that comprise the 6-bit CRC check sequence are automatically

calculated on the ADV7344. This calculation is based on the

lower 128 bits (H0 to H5 and P0 to P121) of the data in the

CGMS Type B data registers. The result is output with the

remaining 128 bits to form the complete 134 bits of the CGMS

Type B data. The calculation of the CRC sequence is based on

the polynomial x6 + x + 1 with a preset value of 111111.

If ED/HD CGMS Type B CRC is disabled, all 134 bits (H0 to H5

and P0 to P127) are output directly from the CGMS Type B

registers (CRC must be calculated by the user manually).

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