zl50064 Zarlink Semiconductor, zl50064 Datasheet - Page 19

• Manufacturer Part Number: zl50064
• Description: 16 K Channel Digital Switch With High Jitter Tolerance, Single Rate 2, 4, 8 Or 16 Mbps And 64 Input And 64 Output Streams
• Manufacturer: Zarlink Semiconductor

2.0
2.1
The device supports five switching configurations: (1) Unidirectional switch, (2) Backplane-to-Local, (3)
Local-to-Backplane, (4) Backplane-to-Backplane, and (5) Local-to-Local. The following sections describe the
switching paths in detail. Configurations (2) - (5) enable a non-blocking bi-directional switch with 8,192 Backplane
input/output channels at Backplane stream data rates of 16.384Mbps, and 8,192 Local input/output channels at
Local stream data rates of 16.384Mbps. The switching paths of configurations (2) to (5) may be operated
simultaneously. When the lower data-rates of 8.192, 4.096 and 2.048Mbps are used, there will be a corresponding
reduction in switch capacity.
2.1.1
The device can be configured as a 16,384 x 16,384 unidirectional switch by grouping together all input streams and
all output streams. All streams can be operated at a data rate of 16.384Mbps. Lower data rates may be used with a
corresponding reduction in switch capacity.
2.1.2
The device can provide data switching between the Backplane input port and the Local output port. The Local
Connection Memory determines the switching configurations.
2.1.3
The device can provide data switching between the Local input port and the Backplane output port. The Backplane
Connection Memory determines the switching configurations.
2.1.4
The device can provide data switching between the Backplane input and output ports. The Backplane Connection
Memory determines the switching configurations.
2.1.5
The device can provide data switching between the Local input and output ports. The Local Connection Memory
determines the switching configurations.
2.1.6
The Local port has 32 input (LSTi0-31) and 32 output (LSTo0-31) data streams. Similarly, the Backplane port has
32 input (BSTi0-31) and 32 output (BSTo0-31) data streams. The bit rate of all these streams is selected by writing
to the Bit Rate Registers, BRR (see Table 24). All the streams operate at the same bit rate at a time. The device can
operate at 2.048, 4.096, 8.192 or 16.384 Mbps. The default operation mode is 2.048Mbps. The timing of the input
and output clocks and frame pulses is shown in Figure 8, “Input and Output Frame Pulse Alignment for Different
Data Rates” on page 22. The input traffic are aligned based on the FP8i and C8i input timing signals, while the
output traffic are aligned based on the FP8o and C8o output timing signals.
2.1.6.1
Operation of stream data in Connection Mode or Message Mode is determined by the state of the LMM bit of the
Local Connection Memory. The channel high impedance state is controlled by the LE bit of the Local Connection
Memory. The data source (i.e. from the Local or Backplane Data Memory) is determined by the LSRC bit of the
Local Connection Memory. Refer to Section 8.1, Local Connection Memory, and Section 11.3, Local Connection
Memory Bit Definition for more details.
Switching Configuration
Functional Description
Unidirectional Switch
Backplane-to-Local Path
Local-to-Backplane Path
Backplane-to-Backplane Path
Local-to-Local Path
Port Data Rate Modes and Selection
Local Output Port
Zarlink Semiconductor Inc.
ZL50062/4
19
Data Sheet