CMX869E2 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX869E2

Low Power V.32 bis Modem

CML Microsystems Plc 

Low Power V.32 bis Modem

CMX869

6.1 General Reset Command

General Reset Command (no data)

C-BUS address $01

This command resets the device and clears all bits of the General Control, Transmit Mode and Receive

Mode Registers and bits 15 and 13-0 of the Status Register. The General Reset command places the

device into Powersave mode.

Whenever power is applied to the CMX869, a built in power-on-reset circuit ensures that the device

powers up into the same state as follows a General Reset command. Nevertheless it is recommended

that a General Reset command be sent to the device on power-up, after which the General Control

Register should be set as required.

6.2 General Control Register

General Control Register: 16-bit write-only. C-BUS address $E0

This register controls general features of the CMX869 such as the Powersave and Loopback modes, the

IRQ mask bits and the Relay Drive output.

All bits of this register are cleared to 0 by a General Reset command.

Bit: 15 14 13 12 11 10 9

8

7

6

5

4

3

2

1

0

0 Hi 0

Gain

0 LB 0 Rly Pwr Rst Irqn

drv

en

IRQ Mask Bits

General Control Register b15: Reserved, set to 0

General Control Register b14: Select high input gain

This bit selects the RXBN input pin and is used to increase the input stage gain.

B14 = 1

B14 = 0

RXBN internally connected to RXAN

RXBN open circuit

General Control Register b13,12: Reserved, set to 00

General Control Register b11: Analogue Loopback test mode

This bit controls the analogue loopback test mode. In loopback test mode both Transmit and

Receive Mode Registers should be set to the same modem type, band and bit rate. The line

interface relay must be open, as the test transmission that is fed back into the Rx path will

appear at the Tx pins.

b11 = 1

b11 = 0

Local analogue loopback mode enabled

No loopback (normal modem operation)

General Control Register b10: Reserved, set to 0

© 2003 CML Microsystems Plc

20

D/869/1

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