ZL50075 datasheet(43/60 Pages) ZARLINK

Part #	ZL50075

Description	32 K Channel Digital Switch with High Jitter Tolerance, Rate Conversion per Group of 2 Streams (8, 16, 32 or 64 Mbps), and 64 Inputs and 64 Outputs

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Manufacturer	ZARLINK [Zarlink Semiconductor Inc]

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ZL50075

Data Sheet

43

Zarlink Semiconductor Inc.

14.6

Output Clock Control Register

The Output Clock Control Register is used to select the desired source, frequency, and logic sense of the output

clocks. The bit functions of the Output Clock Control Register are illustrated in Table 25.

Bit

Name

Description

31 - 28

Unused

Reserved. In normal functional mode, these bits MUST be set to zero.

27 - 14

Unused

Reserved. In normal functional mode, these bits MUST be set to 01100000110100.

13

GCO

SEL1

GCI-Bus Selection for FPo1

When this bit is low, FPo1 is set for ST-BUS mode.

When this bit is high, FPo1 is set for GCI-Bus mode.

12

FPO

POL1

Frame Pulse Polarity Selection for FPo1

When this bit is low, FPo1 is set for active high.

When this bit is high, FPo1 is set for active low.

11

CKO

POL1

Clock Polarity Selection for CKo1

When this bit is low, CKo1 is set for the positive clock edge.

When this bit is high, CKo1 is set for the negative clock edge.

10 - 9

CKO1

RATE

1 - 0

Output Clock Rate for CKo1 and FPo1

The output clock rate can not exceed the selected clock source rate. All rates are avail-

able when the internal system clock is selected as clock source.

8 - 7

CKO1

SRC

1 - 0

Output Clock Source for CKo1 and FPo1

Table 25 - Output Clock Control Register

External Read/Write Address: 40284H

Reset Value: 060D1C3CH

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

0

000

1

0

1

0

1

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

00

GCO

SEL1

FPO

POL1

CKO

POL1

CKO1

RATE1

CKO1

RATE0

CKO1

SRC1

CKO1

SRC0

GCO

SEL0

FPO

POL0

CKO

POL0

CKO0

RATE1

CKO0

RATE0

CKO0

SRC1

CKO0

SRC0

CKO1RATE1 - 0

CKo1FPo1

00

8.192 MHz

120 ns

01

16.384 MHz

60 ns

10

32.768 MHz

30 ns

11

65.536 MHz

15 ns

CKO1SRC1 - 0

Output Timing Source

00

Internal System Clock

01

CKi0 and FPi0

10

Reserved

11

Reserved

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