TNETEL1200

EtherLoop

™ MODEM

SPHS003D – FEBRUARY 1999 – REVISED JUNE 1999

8

POST OFFICE BOX 655303

Terminal Functions (Continued)

analog loop control

TERMINAL

I/O†

DESCRIPTION

NAME

NO.

I/O†

DESCRIPTION

OPEN

105

O

Open. Control signal to open and close link between line driver and line load.

PREAMPEN

120

O

Preamplifier enable. PREAMPEN enables the preamplifier.

RXFSEL_3

RXFSEL_2

RXFSEL_1

RXFSEL_0

113

114

115

116

O

Receiver filter. Bits 3–0 enable the receiver filter sections.

RXGAIN_4

RXGAIN_3

RXGAIN_2

RXGAIN_1

RXGAIN_0

107

108

109

110

111

O

Receiver gain. Bits 4–0 enable the receiver gain sections (1, 2, 4, 8, 16 dB).

RXHIGAIN

118

O

Receiver high gain. RXHIGAIN controls a preamplifier in the receiver.

RXLOGAIN

119

O

Receiver low gain. RXHIGAIN controls a preamplifier in the receiver.

TERMEN

121

O

Termination enable. TERMEN enables the line termination.

TXEN

122

O

Transmitter enable. TXEN enables the output transmitter sections.

TXFSEL_3

TXFSEL_2

TXFSEL_1

TXFSEL_0

129

130

131

132

O

Transmitter filter. Bits 3–0 enable the transmitter filter sections.

TXGAIN_3

TXGAIN_2

TXGAIN_1

TXGAIN_0

124

125

126

127

O

Transmitter gain. Bits 3–0 enable transmitter gain sections.

† I = input, O = output

debug

TERMINAL

I/O†

DESCRIPTION

NAME

NO.

I/O†

DESCRIPTION

ENGDET

200

O

Energy detect

I_7

I_6

I_5

I_4

I_3

I_2

I_1

I_0

171

172

173

174

176

177

178

179

O

Bits 7–0 of the I component of the demodulated signal (test only)

IQSTB

181

O

IQSTB is used to clock out the I and Q data (test only).

Q_7

Q_6

Q_5

Q_4

Q_3

Q_2

Q_1

Q_0

183

184

185

186

188

189

190

191

O

Bits 7–0 of the Q component of the demodulated signal (test only)

† I = input, O = output