MDS1526 P

5

Revision 051310

Integrated Device Technology, Inc. www.idt. com Tech Support: www.idt.com/go/clockhelp

(IDT™/ICS™)

Section 3 Register map summary

ICS1526 Data Sheet

Section 3 Register map summary

Word

Address

Name

Access

Bit Name

Bit#

Reset

Value

Description

00h

Input

Control

R / W

CPen

0

1

Charge Pump Enable

0=External Enable via VSYNC, 1=Always Enabled

VSYNC_Pol

1

0

VSYNC Polarity (Charge Pump Enable)

Requires 00h:0=0

0=Coast (charge pump disabled) while VSYNC low,

1=Coast (charge pump disabled) while VSYNC high

HSYNC_Pol

2

0

HSYNC Polarity

0=Rising Edge, 1=Falling Edge

Reserved

3

0

Reserved

Reserved

4

0

Part requires a 0 for correct operation

Reserved

5

0

Reserved

EnPLS

6

1

Enable PLL Lock Output

0=Disable, 1=Enable

Reserved

7

0

Reserved

01h

Loop

Control*

R / W

ICP0-2

0-2

ICP (Charge Pump Current)

Bit 2,1,0 = {000 =1

µA, 001 = 2 µA, 010 = 4 µA... 110 = 64 µA, 111 =

128

µA}. Increasing the Charge Pump Current makes the loop

respond faster, raising the loop bandwidth. The typical value when

using the internal loop filter is 011.

Reserved

3

Reserved

VCOD0-1

4-5

VCO Divider

Bit 5,4 = {00 = ÷2, 01=÷4, 10=÷8, 11=÷16}

Reserved

6-7

Reserved

02h

FdBk Div

0*

R / W

FBD0-7

0-7

Feedback Divider LSBs (bits 0-7)

03h

FdBk Div

1*

R / W

FBD8-11

0-3

Feedback Divider MSBs (bits 8-11)

Divider setting = 12-bit word + 8

Minimum 12 = 000000000100

Maximum 4103 =111111111111

Reserved

4-7

Reserved

04h

Reserved

Reserved

0-7

0

Reserved

05h

Schmitt-

trigger*

R / W

Schmitt

control

0

1

Schmitt-trigger control

0=Schmitt-trigger, 1=No Schmitt-trigger

Metal_Rev

1-7

0

Metal Mask Revision Number

06h

Output

Enables

R / W

Reserved

0

0

Reserved

OE

1

0

Output Enable for CLK, HSYNC_out, VSYNC_out

0=High Impedance (disabled), 1=Enabled

Reserved

2-7

0

Reserved