PM4541 datasheet(22/46 Pages) PMC

22 / 46 page

TELECOM STANDARD PRODUCT

PMC-Sierra, Inc.

PM4541 T1XC-EVBD

PMC-920314

ISSUE 2

T1XC EVALUATION DAUGHTERBOARD

Switch ID

Label

Mapping

SW1-1

MS0

MS0 (Mode Select '0')

SW1-2

MS1

MS1 (Mode Select '1')

SW1-3

MS2

MS2 (Mode Select '2')

SW1-4

MS3

MS3 (Mode Select '3')

SW1-5

ENC2

ENC20 (Active high enable control for pins

C2O and C2OB )

SW1-6

ENCV

ENCV (Active high enable control for pins

CV and CVB )

SW1-7

ENC4

ENC40 (Active high enable control for pins

C4O and C4OB )

SW1-8

Unused

Setting these switches selects the operating mode for the MT8940, as described below:

Mode #

MS[0:3]

DPLL #1 Operating Mode

DPLL #2 Operating Mode

0000

Normal Mode:

Generates the 1.544 MHz

T1 clock synchronized to

the falling edge of the input

framing pulse.

Externally applied 4.096

MHz. clock and 8 kHz.

frame pulse, properly phase

related, are used to

generate the 2.048 MHz

output clock.

0001

Normal Mode

Operates as above.

Normal Mode:

Generates the CEPT (ST-

BUS) timing signals locked

to the 8 kHz input signal

(C8KB)

0010

Normal Mode

Operates as above.

Externally applied 4.096

MHz. clock is used to

generate the 2.048 MHz

output clock and 8 kHz

frame pulse.

0011

DEFAULT

CONFIG

Normal Mode

Operates as above.

Normal Mode

Generates the CEPT (ST-

BUS) timing signals locked

to the 8 kHz input signal

(C8KB)

PM4541 Datasheet(PDF) 22 Page - PMC-Sierra, Inc

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