ICS1531 datasheet(35/76 Pages) ICST

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Chapter 6

ICS1531 Rev N 12/1/99

December, 1999

ICS1531 Data Sheet - Preliminary

6.5.9

The Internal Filter Register is used to select values for the internal loop filter.

6.5.10

This register is reserved. (See Section 6.1, “Reserved Bits”.)

6.5.11

The Pixel PLL/DPA Reset Register is used to reset the pixel PLL and DPA circuits.

6.5.12

These registers are reserved. (See Section 6.1, “Reserved Bits”.)

Table 6-12.

Internal Filter Register

Bit

Bit Name

Bit Definition

Ac-

cess

Spec.

Func.

Re-

set

08:7

Shunt_Sel

Shunt (Capacitor) Select.

This bit selects the size of the internal filter’s shunt capacitor.

• 0 = Selects an alternate-size shunt capacitor

• 1 = Select the default-size shunt capacitor

R/W

–

08:6-

08:4

Res_Sel [2-0]

Resistor Select [2-0].

These bits are used to select the size of the internal filter’s

resistor as follows:

R/W

–

08:3-

08:1

Cap_Sel [2-0]

Capacitor Select [2-0].

These bits are used to select the size of the internal filter’s

capacitor as follows:

R/W

–

08:0

Fil_Sel

(Loop) Filter Select.

This bit selects the type of loop filter.

• 0 = The loop filter is external.

• 1 = The loop filter is internal (default).

R/W

–

Table 6-13.

Bit

Bit Name

Bit Definition

Ac-

cess

Spec.

Func.

Re-

set

0A:7-

0A:4

Pixel PLL Reset

[3-0]

Pixel Phase-Locked Loop Reset [3-0].

Writing 5xh to these bits does the following:

• Resets the pixel phase-locked loop.

• Loads working Regs 01 to 03.

Write

–

N/A

0A:3-

0A:0

DPA Reset [3-0]

Dynamic Phase Adjust Reset [3-0].

Writing xAh to these bits does the following:

• Resets the Dynamic Phase Adjust.

• Loads working Reg 05.

Write

–

N/A

{(Value of Res_Sel [2-0] bits)

× 4kΩ} + 3kΩ

Resistor value

≈

Capacitor value:

≈ {(Value of Cap_Sel [2-0] bits) + 1} × 236 pF

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