EV8680 datasheet(22/39 Pages) CMLMICRO

22 / 39 page

Evaluation Kit for CMX868

EV8680

UM8680/2

S-Register

Factory Profiles

Reg

Range

Units

Description

‘0’

‘1’

S20

0-255

Decimal

Reserved

S21

0-255

Decimal

BERT options - Provides the following

functions:

Bit

0 - BERT End, 0 Rx Board (AT@F4), 1

Tx Board (AT@F5)

Bit

1 - BERT Operating Band (ignored for

V23/Bell202 BERT operation), 0 Low, 1

High

Bit

2, 3, 4, 5 - Reserved

Bit

6,7 - BERT Scrambler/Descrambler, 11

Enabled (64 ones detect circuit enabled),

10 Enabled (64 ones detect circuit

disabled), 00 Disabled

193

S22

0-255

Decimal

Bit Mapped register - Provides the following

functions:

Bit 0, 1, 2, 3, 4 - Reserved

Bit 5, 6, 7 - Calling Characteristics, 000

(ATX0), 100 (ATX1), 101 (ATX2), 110

(ATX3), 111 (ATX4)

S23

0-255

Decimal

Bit Mapped register - Provides the following

functions:

Bit 0, 1, 2, 3, 4, 5 - Reserved

Bit 6, 7 - Guard Tones (DPSK/QAM high

band operation only), 00 None (AT&G0), 11

550Hz (AT&G1), 10 1800Hz (AT&G2)

S24

0-255

Decimal

Bit Mapped register - Provides the following

functions:

Bit

0 - CMX868 Xtal Freq, 0 12.2880MHz, 1

11.0592MHz

Bit

1 - CMX868 Tx and Rx Fixed

Compromise Equalisers (used during

negotiation and data transfer), 0 Enable,

1 Disable

Bit

2 - CMX868 Auto Equaliser (DPSK

operating modes, always enabled during

V22bis QAM operation), 0 Disable, 1

Enable

Bit 3, 4, 5, 6, 7 – Reserved

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