ACS8509 데이터 시트보기 (PDF) - Semtech Corporation

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ACS8509

Synchronous Equipment Timing Source for SONET or SDH Network Elements

Semtech Corporation 

ACS8509 SETS

ADVANCED COMMUNICATIONS

Table 3 Other Pins (cont...)

Pin Number

Symbol

I/O

75

RDY

O

Type

TTL/CMOS

76 - 83

88

AD(7:0)

O2

IO

TTLD

O

TTL/CMOS

90

O3

O

TTL/CMOS

95

O4

O

TTL/CMOS

99

MSTSLVB

I

TTLU

100

SONSDHB

I

TTLD

FINAL

DATASHEET

Description

Ready/Data Acknowledge: This pin is asserted High to indicate the device

has completed a read or write operation.

Address/Data: Multiplexed data/address bus depending on the

microprocessor mode selection. AD(0) is SDO in Serial mode.

Output Reference 2: Default 6.48 MHz. Also Dig1 (1.544 MHz/2.048 MHz

and 2, 4, 8 x), 19.44 MHz, 25.92 MHz

Output Reference 3: 19.44 MHz - fixed.

Output Reference 4: 1.544/2.048 MHz, (T4 BITS).

Master/Slave Select: Sets the initial power-up state (or state after a PORB)

of the Master/Slave selection register, Reg. 34, Bit 1. The register state

can be changed after power up by software.

SONET or SDH Frequency Select: Sets the initial power-up state (or state

after a PORB) of the SONET/SDH frequency selection registers, Reg. 34, Bit

2 and Reg. 38, Bit 5 and Bit 6. When set Low, SDH rates are selected

(2.048 MHz etc.) and when set High, SONET rates are selected (1.544 MHz

etc.) The register states can be changed after power-up by software.

Revision 2.00/January 2006 © Semtech Corp.

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