CDCE937

CDCEL937

www.ti.com

SLAS564F – AUGUST 2007 – REVISED MARCH 2010

SDA/SCL CONFIGURATION REGISTERS

The clock input, control pins, PLLs, and output stages are user configurable. The following tables and

explanations describe the programmable functions of the CDCE937/CDCEL937. All settings can be manually

written into the device via the SDA/SCL bus or easily programmed by using the TI Pro-Clock™ software. TI

Pro-Clock™ software allows the user to quickly make all settings and automatically calculates the values for

optimized performance at lowest jitter.

Table 7. SDA/SCL Registers

Address Offset

Register Description

Table

00h

Generic Configuration Register

Table 9

10h

PLL1 Configuration Register

Table 10

20h

PLL2 Configuration Register

Table 11

30h

PLL3 Configuration Register

Table 12

The grey-highlighted bits, described in the Configuration Registers tables in the following pages, belong to the

Control Terminal Register. The user can predefine up to eight different control settings. These settings then can

be selected by the external control pins, S0, S1, and S2 (see the Control Terminal Configuration section).

Table 8. Configuration Register, External Control Terminals

Y1

PLL1 Settings

PLL2 Settings

PLL3 Settings

External

Output

Freq.

SSC

Output

Freq.

SSC

Output

Freq.

SSC

Output

Control Pins

Selection

Selection

Selection

Selection

Selection

Selection

Selection

Selection

Selection

Selection

S2

S1

S0

Y1

FS1

SSC1

Y2Y3

FS2

SSC2

Y4Y5

FS3

SSC3

Y6Y7

0

0

0

0

Y1_0

FS1_0

SSC1_0

Y2Y3_0

FS2_0

SSC2_0

Y4Y5_0

FS3_0

SSC3_0

Y6Y7_0

1

0

0

1

Y1_1

FS1_1

SSC1_1

Y2Y3_1

FS2_1

SSC2_1

Y4Y5_1

FS3_1

SSC3_1

Y6Y7_1

2

0

1

0

Y1_2

FS1_2

SSC1_2

Y2Y3_2

FS2_2

SSC2_2

Y4Y5_2

FS3_2

SSC3_2

Y6Y7_2

3

0

1

1

Y1_3

FS1_3

SSC1_3

Y2Y3_3

FS2_3

SSC2_3

Y4Y5_3

FS3_3

SSC3_3

Y6Y7_3

4

1

0

0

Y1_4

FS1_4

SSC1_4

Y2Y3_4

FS2_4

SSC2_4

Y4Y5_4

FS3_4

SSC3_4

Y6Y7_4

5

1

0

1

Y1_5

FS1_5

SSC1_5

Y2Y3_5

FS2_5

SSC2_5

Y4Y5_5

FS3_5

SSC3_5

Y6Y7_5

6

1

1

0

Y1_6

FS1_6

SSC1_6

Y2Y3_6

FS2_6

SSC2_6

Y4Y5_6

FS3_6

SSC3_6

Y6Y7_6

7

1

1

1

Y1_7

FS1_7

SSC1_7

Y2Y3_7

FS2_7

SSC2_7

Y4Y5_7

FS3_7

SSC3_7

Y6Y7_7

Address

04h

13h

10h–12h

15h

23h

20h–22h

25h

33h

30h–32h

35h

(1)

Address Offset refers to the byte address in the Configuration Register in the following pages.

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