M4640-19 데이터 시트보기 (PDF) - Conexant Systems

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M4640-19

Baseband Processor for GSM Applications

Conexant Systems 

Baseband Processor

M46

Register Address

(Hex)

0040A00

0040A10

0040A02

0040A12

0040A04

0040A14

0040A06

0040A16

0040A08

0040A18

Table 17. PWM Control Registers

Register Function

Control Register for PWM circuit 1:

Bit [15:2]: Reserved.

Bit [1]: Read the value of the 32-bit Shift Register (0 = read latch, 1 = read

Shift Register).

Bit [0]: PWM circuit 1 enable (0 = off, 1 = on).

Control Register for PWM circuit 2:

Bit [15:2]: Reserved.

Bit [1]: Read the value of the 32-bit Shift Register (0 = read latch, 1 = read

Shift Register).

Bit [0]: PWM circuit 2 enable (0 = off, 1 = on).

Annunciator Duty Cycle Register for PWM circuit 1:

Bit [15:8]: Reserved.

Bit [7:0]: Duty cycle.

Annunciator Duty Cycle Register for PWM circuit 2:

Bit [15:8]: Reserved.

Bit [7:0]: Duty cycle.

Divider Register for PWM circuit 1:

Bit [15:10]: Reserved.

Bit [9:0]: Divider ratio.

Divider Register for PWM circuit 2:

Bit [15:10]: Reserved.

Bit [9:0]: Divider ratio.

Counter Register for PWM circuit 1:

Bit [7:0]: Counter value.

Counter Register for PWM circuit 2:

Bit [7:0]: Counter value.

Data pattern latch for PWM circuit 1:

Bit [31:0]: 32-bit data pattern.

Data pattern latch for PWM circuit 2:

Bit [31:0]: 32-bit data pattern.

After successful derivation of these parameters, the Autobaud

circuit programs the SDS port with the information, enables the

SDS port, and disables itself. The SDS port will therefore start to

receive characters immediately after the “t,” “T,” or “/” is received

as the second character. While the Autobaud block is

reprogramming the SDS port, the ARM cannot access the port

configuration registers.

After the Autobaud block disables itself, an interrupt is sent to

the ARM to indicate that valid data is being received by the SDS

port. The values of the characters that were decoded are stored

so the ARM can determine which characters were detected.

Autobaud Limitations ________________________________

There are certain limitations on the baud rates, character

combinations, and data formats that can be detected by the

Autobaud circuit. These limitations are described below.

Baud Rates. The following baud rates can be detected:

• 230.4 kbps

• 115.2 kbps

• 57.6 kbps

• 38.4 kbps

• 19.2 kbps

• 9.6 kbps

• 4.8 kbps

• 2.4 kbps

When a low edge is detected on the SDS_RX signal (indicating

a start bit), the Autobaud circuit starts to search for the required

set of start characters, determines the baud rate, determines

whether the data is formatted into seven bit or eight-bit words,

and detects if the parity is odd or even.

100779C

Conexant

Proprietary Information and Specifications are Subject to Change

29

June 14, 2000

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