ZL50074GAC ZARLINK [Zarlink Semiconductor Inc], ZL50074GAC Datasheet - Page 2

• Manufacturer Part Number: ZL50074GAC
• Description: 32 K x 32 K Channel TDM Switch with 128 Input and 128 Output Streams
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

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Description
The ZL50074 is a non-blocking Time Division Multiplex (TDM) switch with maximum 32,768 x 32,768 channels. The
device can switch 64 kbps or Nx64 kbps TDM channels from any input stream to any output stream.
All TDM input and output streams operate at the same rate, either 65.536 Mbps, 32.768 Mbps, 16.384 Mbps or
8.192 Mbps, programmed by the Global Rate Control Register. In 65 Mbps mode, only STiA and SToA streams are
used, resulting in 32 input and 32 output streams. In 32 Mbps mode, STiA, SToA, STiB, and SToB streams are
available, resulting in 64 input and 64 output streams. In 16 Mbps or 8 Mbps mode, STiA, SToA, STiB, SToB, STiC,
SToC, STiD and SToD streams are all available, resulting in 128 input and 128 output streams. The full 32 K x 32 K
channel switching capacity is maintained at bit rates of 65 Mbps, 32 Mbps and 16 Mbps. The capacity reduces to
16 K x 16 K when operating at 8 Mbps.
The ZL50074 uses a master clock (CKi0) and frame pulse (FPi0) to define the TDM data stream frame boundary
and timing. A high speed system clock is derived internally from CKi0 and FPi0. The input and output data streams
can independently reference their timings to one of the input clocks or to the internal system clock.
The ZL50074 has a variety of user configurable options designed to provide flexibility when data streams are
connected to multiple TDM components or circuits. These include:
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The device contains two types of internal memory: Data Memory and Connection Memory. Incoming TDM data is
stored in the Data Memory. TDM Data is read from the Data Memory controlled by the Connection Memory, and
output on the TDM Output Streams.
There are two major modes of operation: Connection Mode and Message Mode. In Connection Mode, the contents
of the Connection Memory define, for each output stream and channel, the input source stream and channel. In
Message Mode, the Connection Memory is used for the storage of microprocessor data. Using Zarlink's Message
Mode capability, microprocessor data can be broadcast to the data output streams on a per-channel basis. This
feature is useful for transferring control and status information for external circuits or other TDM devices.
The non-multiplexed microprocessor port provides access to the internal Data Memory, Connection Memory and
configuration registers used to program ZL50074 options. The port is configurable to interface with either Motorola
or Intel-type microprocessors and is selectable to be either 32 bit or 16 bit.
The mandatory requirements of IEEE 1149.1 (JTAG) standard are supported via the dedicated Test Access Port.
Digital Loop Carriers
Time Division Multiplexers
Media Gateways
Two additional programmable reference inputs, CKi2 - 1 and FPi2 - 1, which can be used to provide
alternative sources for input and output stream timing
Variable input bit delay and output advancement, to accommodate delays and frame offsets of streams
connected through different data paths
Four timing outputs, CKo3 - 0 and FPo3 - 0, which can be configured independently to provide a variety of
clock and frame pulse options
Support of both ST-BUS and GCI-Bus formats
Per-channel variable delay mode for low latency applications and constant delay mode for frame integrity
applications
Zarlink Semiconductor Inc.
ZL50074
2
Data Sheet