TFP503

PanelBus HDCP DIGITAL RECEIVER

SLDS149 − AUGUST 2004

16

POST OFFICE BOX 655303

TFP503 output driver configurations (continued)

Both PDO and PD have internal pullup resistors; so, if left unconnected, they default the TFP503 to normal

operating modes.

Sync detect. The TFP503 offers an output, SCDT, to indicate link activity. The TFP503 monitors activity on DE

to determine if the link is active. When 1 million pixel clock periods pass without a transition on DE, the TFP503

considers the link inactive and SCDT is driven low. SCDT goes high immediately after the first eight transitions

SCDT can signal a system power-management circuit to initiate a system power down when the link is

considered inactive. The SCDT can also be tied directly to the TFP503 PDO input to power down the output

drivers when the link is inactive. It is not recommended to use the SCDT to drive the PD input since, once in

complete power down, the analog inputs are ignored and the SCDT state does not change. An external system

power management circuit to drive PD is preferred.

HDCP register map

TERMINAL 94

WRITE ADDRESS (HEX)

READ ADDRESS (HEX)

0

74

75

1

76

77

BKSV

Subaddress = 00

Read Only

7

6

5

4

3

2

1

0

BKSV[7:0]

Subaddress = 01

Read Only

7

6

5

4

3

2

1

0

BKSV[15:8]

Subaddress = 02

Read Only

7

6

5

4

3

2

1

0

BKSV[23:16]

Subaddress = 03

Read Only

7

6

5

4

3

2

1

0

BKSV[31:24]

Subaddress = 04

Read Only

7

6

5

4

3

2

1

0

BKSV[39:32]