ACE9050 datasheet(33/52 Pages) MITEL

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ACE9050

Fig.20 AMPS/TACS Modem and SAT Controller

Associated Registers

The Modem has 3 dedicated registers for control and data

transfer. There are also bits in the general registers PORT3 and

PORT4 which are used to set up the Modem. The bits are

described in more detail in the relevant section.

MDMSLP PORT3[3] (Table 59)

This bit determines whether the modem is active or in sleep

mode. The modem is put into sleep mode by turning off the clock

to the Modem and associate circuitry.

Table 59

MDMSLP

Active

Sleep

Modem mode

ENMOD PORT3[7]

This bit is used to set up the Modem. It must be set to 1 by the

software after a reset and before the Modem is used. It should

then remain at 1.

SATMUX PORT4[2] (Table 60)

This bit is used to control the source of the Transmitted SAT

signal.

SATMUX

Locally generated SAT

RXSAT

Multiplexer output

Table 60

NOMPLL PORT4[4] (Table 61)

In the Data Decoder the modem uses a locally generated

clock to recover the data. NOMPLL selects whether this clock is

forced to lock to the extract Data clock or not. Refer to Data

Decoder section for more detail.

NOMPLL

Normal mode: Data clock locked to incoming clock

Free-running: Data clock unlocked

Decoder clock

Table 61

MODPRT0 (Table 62)

This is a dedicated read/write port used for controlling the

Modem;

Bit

Function

0 = Reset Modem

1 = Modem enabled

0 = TACS Modem

1 = AMPS Modem

[5:4] bits: SAT generator

00 = 5·97kHz

01 = 6·00kHz

10 = 6·03kHz

11 = No SAT transmitted

0 = TX output disabled

1 = TX output enabled

0 = Capture mode

1 = Sync mode

0 = Word sync disabled

1 = Receiver will re-synchronise

0 = Control channel

1 = Voice channel

[5: 4]

Name

MDRESN

A_TN

SCCTX [1:0]

ENAMPI

SYNDET

ENWS

VC_CCN

Table 52

Table 63

Bit

Function

Must always be set to 0

0 = TX Data not inverted

1 = TX Data inverted

0 = RX Data not inverted

1 = RX Data inverted

0 = Discriminator enabled

1 = Discriminator bypassed (Test)

Set the squelch threshold level

3: 0

Name

MDMTST

TXDINV

RXDINV

LF1_2

SQLEV [3: 0]

MODPRT1

This is a dedicated read/write port used for controlling the

Modem.

Write (Table 63)

SAT

DECODER

SAT

TRANSMITTER

MICRO DATA BUS

AND CONTROL

DATA RECEIVER

WORD SYNC DET

DATA DECODER

DISCRIMINATOR

DATA

TRANSMITTER

AFC/RXDATA

RXSAT

TXSAT

TXDATA

ACE9050

DEMODULATOR

AFCIN

450kHz

504kHz

ACE9030

ACE9040

AUDIO

54kHz

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