LZT 123 1836
52
For standard GSM voice a 13-Bit PCM data word is embedded in a 16-bit word frame,
as shown in Figure 5.10-1 below.
LSB
MSB
D0
D15
13-bit sample occupies these frame bits
sample LSB justified
LSB
MSB
D0
D15
13-bit sample occupies these frame bits
sample LSB justified
Figure 5.10-1 Typical 16-bit PCM Voice Sample Word Format
Typical PCM data transfer is shown in the following figures.
MSB
MSB
LSB
LSB
SSPCLK
SSPFS
SSPDFM
SSPDTM
Q
Q
MSB
MSB
LSB
LSB
SSPCLK
SSPFS
SSPDFM
SSPDTM
Q
Q
Figure 5.10-2 PCM Frame format for a single transfer
MSB
MSB
LSB
LSB
LSB
LSB
MSB
MSB
Frame
n
Frame
n-1
Frame
n+1
SSPCLK
SSPFS
SSPDFM
SSPDTM
MSB
MSB
LSB
LSB
LSB
LSB
MSB
MSB
Frame
n
Frame
n-1
Frame
n+1
SSPCLK
SSPFS
SSPDFM
SSPDTM
Figure 5.10-3 PCM Frame format for a continuous transfer
Содержание GS64
Страница 1: ...GS64 GSM GPRS Modem Integrators Manual...
Страница 8: ...LZT 123 1836 8 Overview...
Страница 22: ...LZT 123 1836 22 Integrating the Wireless Modem...
Страница 64: ...LZT 123 1836 64 Figure 5 15 1 Typical circuit for LEDs...
Страница 91: ...LZT 123 1836 91 Developers Kit...