PROGRAMMABLE REGISTERS

At power-up, data is read from an external EEPROM. If any-

thing other than 00H is read back on the first EEPROM ac-

cess (indicating EEPROM not present), the internal default

values are used. The following parameters are initialized at

power up. Pullups must be used on EE_SD and EE_SC

pins.

TABLE 2. FPD85310 Programmable Register Definition

Control

Registers

EEPROM

Address

The control registers provide mode setting information to the input and output interfaces.

Output Format

Control

D2

[1:0]

“00” = Dual Bus, Single port CD interface

“01” = Dual Bus, Dual port CD interface

“10” = Single Bus, Single port CD interface

“11” = Not implemented (defaults to “10”)

[2]

“0” = Non-Skewed outputs

“1” = Skewed outputs

[3]

“0” = Data inversion is disabled

“1” = Data inversion is enabled

[4]

“0” = Data inversion when GPO[0] is “0”

“1” = Data inversion when GPO[0] is “1”

[5]

“0” = Even and Odd data inversion when data inversion is enabled

“1” = Odd data inversion determined by bit[4], Even data opposite of Odd data

[6]

“0” = Polarity Function disabled

“1” = Polarity Function enabled

[7]

“0” = OPOL/EPOL = 0 when data is inverted

“1” = OPOL/EPOL = 1 when data is inverted

D3

[1:0]

Odd Start Pulse Offset

“00” = Start pulse 0 clocks before data

“01” = Start pulse 1 clock before data

“10” = Start pulse 2 clocks before data

“11” = Start pulse 3 clocks before data

[3:2]

Even Start Pulse Offset

“00” = Start pulse 0 clocks before data

“01” = Start pulse 1 clock before data

“10” = Start pulse 2 clocks before data

“11” = Start pulse 3 clocks before data

[7:4]

Unused Pixels

“0000” = no unconnected pixels at beginning of first CD

“0001” = 1 unconnected pixel at beginning of first CD

“0010” = 2 unconnected pixels at beginning of first CD

...

...

“1111” = 15 unconnected pixels at beginning of first CD

www.national.com

10