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M4640-19 View Datasheet(PDF) - Conexant Systems

Part NameDescriptionManufacturer
M4640-19 Baseband Processor for GSM Applications Conexant
Conexant Systems Conexant
M4640-19 Datasheet PDF : 47 Pages
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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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