ZL50057 ZARLINK [Zarlink Semiconductor Inc], ZL50057 Datasheet - Page 32
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ZL50057
Manufacturer Part Number
ZL50057
Description
12 K-Channel Digital Switch with High Jitter Tolerance, Per Stream Rate Conversion (2, 4, 8, 16, or 32 Mbps), and 48 Inputs and 48 Outputs
Manufacturer
ZARLINK [Zarlink Semiconductor Inc]
Datasheet
1.ZL50057.pdf
(108 pages)
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ZL50057GAG2
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3.2
This feature is used to advance the output channel alignment of individual Local or Backplane output streams with
respect to the frame boundary FP8o. Each output stream has its own advancement value that can be programmed
by the Output Advancement Registers. The output advancement selection is useful in compensating for various
parasitic loading on the serial data output pins.
The Local and Backplane Output Advancement Registers, LOAR0 - LOAR15 and BOAR0 - BOAR31, are used to
control the Local and Backplane output advancement respectively. The advancement is determined with reference
to the internal system clock rate (131.072 MHz). For 2 Mbps, 4 Mbps, 8 Mbps or 16 Mbps streams, the
advancement can be 0, -2 cycles, -4 cycles or -6 cycles, which converts to approximately 0 ns, -15 ns, -31 ns or
-46 ns as shown in Figure 12. For 32 Mbps streams, the advancement can be 0, -1 cycle, -2 cycles or -3 cycles,
which converts to approximately 0ns, -7.6 ns, -15 ns or -23 ns.
Figure 11 - Backplane and Local Input Bit Delay or Sampling Point Selection Timing Diagram for
BID[4:0]/LID[4:0] = 00000
SMPL_MODE = HIGH
BID[4:0]/LID[4:0] = 00000
BID[4:0]/LID[4:0] = 00011
BID[4:0]/LID[4:0] = 00011
SMPL_MODE = LOW
Bit delay = 0 bit (Default)
Output Advancement Programming (Backplane and Local Output Streams)
Please refer to Control Register (Section 14.1) for SMPL_MODE definition.
3/4 sampling (Default)
BSTi0-31/LSTi0-15
BSTi0-31/LSTi0-15
BSTi0-31/LSTi0-15
BSTi0-31/LSTi0-15
Bit Delay = 3/4 bit
2/4 sampling
FP8i
FP8i
C8i
C8i
B
B
B
B
1
1
1
Ch127
Ch127
Ch127
Ch127
1
0
0
0
Zarlink Semiconductor Inc.
Data Rate of 8 Mbps
ZL50057/8
0
7
7
7
32
sample at 2/4 point
sample at 3/4 point
sample at 3/4 point
7
6
6
6
Ch0
Ch0
Ch0
sample at 3/4 point
Ch0
6
5
5
5
5
4
4
4
4
3
3
3
3
2
2
2
Data Sheet
2
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