Tsa (Time Slot Assigner); Overview; Tsa Block Diagram - Samsung S3C2500B User Manual

S3C2500B

9.4 TSA (TIME SLOT ASSIGNER)

9.4.1 OVERVIEW

The S3C2500B includes three time-slot-assigners (TSA), which provide flexible data path control between the
three HDLCs and external interfaces. A variety of data interface can be supported by the S3C2500B with the TSA
: raw Data Communication Equipment (DCE), Pulse Code Modulation (PCM) highway (non-multiplexed mode
and multiplexed mode) and ISDN Oriented Modular Interface (IOM2).
Each TSA can be programmed to select one between DCE and PCM highway (non-multiplexed) interface.
Besides DCE/PCM highway, interface A can afford IOM2 interface to multiplex data from each HDLC channel on
HDLCA pad interface and interface B can afford PCM highway (multiplexed) interface to multiplex data from
each HDLC channel on HDLCB pad interface. In DCE interface, the internal HDLC can directly be connected to
the external serial interface. In PCM highway and IOM2 interface, the TSA is located between the HDLC and the
external serial interface. By intervening in-between, the TSA provides the appropriate HDLC clocks during its
programmed timeslot within an 8-KHz frame.
The TSA can support a maximum data rate of up to 10 Mbps with HDLCs. In PCM highway interface, up to 156
time-slots can be supported with credible data transfer. Although the S3C2500B can support up to 4096 bit
positions (12bit programmable), this requires a lower frequency of FSC or a high frequency of clock rates.
The IOM2 is pin-multiplexed with HDLCA pins and the PCM highway (multiplexed) is pin-multiplexed with
HDLCB pin interface and the HDLCC pins are dedicated to DCE interface.

9.4.2 TSA BLOCK DIAGRAM

HDLCA
HDLCB
HDLCC
TSA
TSA
TSA
Figure 9-6. TSA Block Diagram
DCEA
MUX
TDMA
IOM2
DCEB
MUX
TDMB
DCEC
MUX
TDMC
IOM2 CONTROLLER
DCE/IOM2/
PCM(non-multiplexed)
interface
DCE/PCM(multiplexed)/
PCM(non-multiplexed)
interface
DCE/
PCM(non-multiplexed)
interface
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