PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 26

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
3.1.2
The Serial Audio Interface is a generic 5-line serial interface with the following lines:
SCLK
SR
ST
RFS
TFS
Figure 8 shows an example where RFS is input and TFS is output.
Figure 8
SCLK
RFS
Serial Bit Clock
Serial Receive
Serial Transmit
Receive Frame Sync
Transmit Frame Sync
Input or output
Bits on SR/ST are clocked out with the rising edge of SCLK and latched in with
the falling edge of SCLK. Alternatively, bits can be clocked out with the falling
edge of SCLK and latched in with the rising edge. When SCLK is programmed
as output, it is derived from a programmable baud rate generator. Additionaly,
SLCK can be set to strobed operation.
Input or output
Marks the beginning of the physical frame on SR.
When input
When output
Serial Audio Interface
Input/output.
Input or output.
Input/output.
Input or output.
Input or output.
Sampled with a falling edge of SCLK.
Clocked out with the rising or falling edge of SCLK
(duration = 1 SCLK period).
Repetition rate (continuous mode) or number of
pulses (burst mode) is programmable
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Interfaces and Memory Organization
Data Sheet 1998-07-01
PSB 7238