PEB2447 SIEMENS [Siemens Semiconductor Group], PEB2447 Datasheet - Page 11

• Manufacturer Part Number: PEB2447
• Description: Memory Time Switch Extended Large MTSXL
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

2
The MTSXL is a memory time switch device. Operating with a device clock of
16.384 MHz it can connect any of 2048 PCM input channels to any of 2048 output
channels.
A general block diagram of the MTSXL is shown in figure 3.
2.1
The input information of a complete frame is stored twice in the two on-chip 16-kbit data
memories DM 0 and DM 1 (Data Memory 0 and Data Memory 1). The incoming
2048 channels of 8 bits each are written in sequence into fixed positions of DM 0 and
DM 1. This is controlled by the input counter in the timing control block with a 8 kHz
repetition rate.
For outputting, two connection memories (CM 0 and CM 1) are read in sequence
synchronously. Each entry in the connection memory CM 0 / CM 1 points to a location
in data memory DM 0 / DM 1. The byte in this data memory location is transferred into
the current output time slot. The read access to the CM’s is controlled by an output
counter. CM 0 supplies the PCM data for outputs OUT0 to OUT15, CM 1 supplies the
PCM data for outputs OUT16 to OUT31.
Semiconductor Group
Functional Description
General Operation
11
Functional Description
PEB 2447
03.97