PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 27

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

TFS
SCLK is derived from the chip-internal DSP clock via a programmable baud rate
generator (division factor 1, 2, 3,
The Receive Frame Sync (RFS), when programmed as output, has two selectable
modes of operation:
– In the continuous mode (CONT = 1), pulses are continuously generated, separated
– In the burst mode (CONT = 0), pulses are generated upon command a
The same applies to TFS when it is an output.
Channels
Two Audio receive and transmit channels
Two HDLC receive and transmit channels
Semiconductor Group
by a distance
16
programmable number of times (REP + 1: 1,
each other.
(PRD + 1) bits from each other, where PRD = 0,
Input or output
Marks the beginning of the physical frame on ST.
When input
When 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.
, 1024).
27
Independently programmable on SR, ST,
DU or DD with programmable locations
(start at bit 1
(1
DU or DD with programmable locations
(start at bit 1
(1
Independently programmable on SR, ST,
Interfaces and Memory Organization
256 bits) with respect to RFS/TFS.
32 bits) with respect to RFS/TFS.
, 1024), spaced 16 bits apart from
, 255.
512) and lengths
512) and lengths
Data Sheet 1998-07-01
PSB 7238