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ZL50062 Datasheet(PDF) 34 Page - Zarlink Semiconductor Inc

No. de Pieza. ZL50062
Descripción  16K-Channel Digital Switch with High Jitter Tolerance, Single Rate (2, 4, 8, or 16Mbps), and 64 Inputs and 64 Outputs
Descarga  68 Pages
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Fabricante  ZARLINK [Zarlink Semiconductor Inc]
Página de inicio  http://www.zarlink.com
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ZL50062 Datasheet(HTML) 34 Page - Zarlink Semiconductor Inc

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ZL50062/4
Data Sheet
34
Zarlink Semiconductor Inc.
11.1
Local Data Memory Bit Definition
The 8-bit Local Data Memory (LDM) has 8,192 positions. The locations are associated with the Local input streams
and channels. As explained in the section above, address bits A13-A0 of the microprocessor define the addresses
of the streams and the channels. The LDM is read-only and configured as follows:
Table 8 - Local Data Memory (LDM) Bits
Note that the Local Data Memory is actually an 8-bit wide memory. The most significant 8 bits expressed in the
table above are presented to provide 16-bit microprocessor read accesses.
11.2
Backplane Data Memory Bit Definition
The 8-bit Backplane Data Memory (BDM) has 8,192 positions. The locations are associated with the Backplane
input streams and channels. As explained previously, address bits A13-A0 of the microprocessor define the
addresses of the streams and the channels. The BDM is read-only and configured as follows:
Table 9 - Backplane Data Memory (BDM) Bits
Note that the Backplane Data Memory is actually an 8-bit wide memory. The most significant 8 bits expressed in the
table above are presented to provide 16-bit microprocessor read accesses.
11.3
Local Connection Memory Bit Definition
The Local Connection Memory (LCM) has 8,192 addresses of 16-bit words. Each address, accessed through bits
A13-A0 of the microprocessor port, is allocated to an individual Local output stream and channel. The bit definition
for each 16-bit word is presented in Table 10 for Source-to-Local connections.
The most-significant bit in the memory location, LSRC, selects the switch configuration for Backplane-to-Local or
Local-to-Local. When the per-channel Message Mode is selected (LMM memory bit = HIGH), the lower byte of the
LCM word (LCAB[7:0]) will be transmitted as data on the output stream (LSTo0-31) in place of data defined by the
Source Control, Stream and Channel Address bits.
Bit
Name
Description
15:8
Reserved
Set to a default value of 8’h00.
7:0
LDM
Local Data Memory - Local Input Channel Data.
The LDM[7:0] bits contain the timeslot data from the Local side input TDM
stream. LDM[7] corresponds to the first bit received, i.e. bit 7 in ST-BUS mode,
bit 0 in GCI-Bus mode. See Figure 7, ST-BUS and GCI-Bus Input Timing
Diagram for Different Data Rates for the arrival order of the bits.
Bit
Name
Description
15:8
Reserved
Set to a default value of 8’h00.
7:0
BDM
Backplane Data Memory - Backplane Input Channel Data.
The BDM[7:0] bits contain the timeslot data from the Backplane side input TDM
stream. BDM[7] corresponds to the first bit received, i.e. bit 7 in ST-BUS mode,
bit 0 in GCI-Bus mode. See Figure 7, ST-BUS and GCI-Bus Input Timing
Diagram for Different Data Rates for the arrival order of the bits


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