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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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M46
Baseband Processor
Table 21. Flow Control/Escape Sequence Detection Control Register Functions
Bit
Signal
15:4 N/A
3
Counter enable
2
XOFF enabled
1
XON enabled
0
Escape sequence enable
Function
Reserved
Enable/disable the guard time counter used during the escape sequence detection:
0 = counter disabled
1 = counter enabled
0 = XOFF detection disabled
1 = XOFF detection enabled
0 = XON detection disabled
1 = XON detection enabled
0 = escape sequence detection disabled
1 = escape sequence detection enabled
Table 22. Flow Control/Escape Sequence Detection Status Register Functions
Bit
Signal
15:3 N/A
2
XOFF detected
1
XON detected
0
Escape sequence detected
Function
Reserved
Set to “1” if the XOFF character has been detected. This bit can be cleared by the ARM.
Set to “1” if the XON character has been detected. This bit can be cleared by the ARM.
Set to “1” if the escape sequence has been detected. This bit can be cleared by the ARM.
Escape Sequence Detection and Flow Control
The function of these blocks is to detect an escape sequence or
the XON/XOFF flow control characters on the SDS serial port.
The escape sequence is a programmable series of characters
(normally “+++”) used in some serial communication protocols.
The escape sequence is separated from other data by a large
guard time.
Detection and Flow Control circuitry. The function of each of the
bits in this register is described in Table 21.
Flow Control/Escape Sequence Detection Status Register.
The Flow Control/Escape Sequence Detection Status Register
is used to indicate the detection status for each of the character
sequences (escape sequence, XON, XOFF). The function of
each of the bits in this register is described in Table 22.
The detection functions monitor the data bytes received on the
SDS_RX line. If the escape character sequence, the XON
character, or the XOFF character is detected, the associated
flag is set.
Registers for Flow Control/Escape Sequence
Detection __________________________________________
Escape Sequence Character Register. The Escape Sequence
Character Register is used to store the escape sequence
character. Bits [7:0] hold the 8-bit character to be compared with
the SDS_RX input data to determine if the escape sequence
has occurred. The default character is “+.” The character must
occur three times (e.g., “+++”) for the escape sequence to be
detected.
The Flow Control/Escape Sequence Detection registers include
the following:
Control Register
Status Register
Escape Sequence Character Register
XON Character Register
XOFF Character Register
Escape Sequence Timout Register
The address and default values for the Escape Sequence
Detection and Flow Control Registers are specified in Table 2.
Flow Control/Escape Sequence Detection Control Register.
The Flow Control/Escape Sequence Detection Control Register
is used to configure the operation of the Escape Sequence
XON Character Register. The XON Character Register is used
to store the XON character. Bits [7:0] store the 8-bit character
that is to be compared with the SDS_Rx input data to determine
if the XON character has been received.
XOFF Character Register. The XOFF Character Register is
used to store the XOFF character. Bits [7:0] store the 8-bit
character that is to be compared with the SDS Rx input data to
determine if the XOFF character has been received.
Escape Sequence Timeout Register. The Escape Sequence
Timeout Register is used to specify the guard band time. The
escape character sequence has a guard band before and after
the escape sequence characters. Bits [7:0] of this register set
the guard band. The guard band is set as the register contents
multiplied by 20 ms. The value of this register should be
between 1 and 255.
32
June 14, 2000
Conexant
Proprietary Information and Specifications are Subject to Change
100779C
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