zl50018gag2 Zarlink Semiconductor, zl50018gag2 Datasheet - Page 25
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zl50018gag2
Manufacturer Part Number
zl50018gag2
Description
2 K Digital Switch With Enhanced Stratum 3 Dpll
Manufacturer
Zarlink Semiconductor
Datasheet
1.ZL50018GAG2.pdf
(136 pages)
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The output timing is dependent on the operation mode that is selected. When the device is in Divided Slave mode,
the frequencies on CKo0 - 3 cannot be greater than the input clock, CKi. For example, if the input clock is
8.192 MHz, the CKo2 pin will not produce a valid output clock and the CKo3 pin can only be programmed to output
a 4.096 MHz or 8.192 MHz clock signal. The output clocks CKo4 - 5 will not generate valid outputs unless the
SLV_DPLLEN (bit 13) of the Control Register (CR) is set.
In Master mode there are programmable output frame pulse, FPo3, and clock pins, CKo3 and CKo4. The outputs
from FPo3 and CKo3 are programmed by the CKOFPO3SEL1 - 0 (bits 13 - 12) in the Output Clock and Frame
Pulse Selection (OCFSR) register. The output clock pin, CKo4, is controlled by setting the CKO4SEL (bit 14) in the
OCFSR register.
In Multiplied Slave mode, CKo4 and CKo5 are not available unless SLV_DPLLEN is set in the Control Register. All
other clocks and frame pulses correspond to the timing shown in Table 3 above.
The device also delivers positive or negative output frame pulse and ST-BUS/GCI-Bus output clock formats via the
programming of various bits in the Output Clock and Frame Pulse Selection Register (OCFSR). By default, the
device delivers the negative output clock format. The ZL50018 can also deliver GCI-Bus format output frame pulses
by programming bits of the Output Clock and Frame Pulse Selection Register (OCFSR). As there is a separate bit
setting for each frame pulse output, some of the outputs can be set to operate in ST-BUS mode and others in
GCI-Bus mode.
The following figures describe the usage of the FPO0P, FPO1P, FPO2P, FPO3P, CKO0P, CKO1P, CKO2P, CKO3P,
CKO4P and CKO5P bits to generate the FPo0 - 3 and CKo0 - 5 timing. FPo_OFF2 is configured to provide the
non-offset frame pulse corresponding to the 19.44 MHz clock on CKo5 by setting the FP19EN (bit 10) in the
FPOFF2 register. In this instance, FPo_OFF2 can be labeled as FPo5.
FPo0 pulse width
FPo1 pulse width
FPo2 pulse width
FPo3 pulse width
FPo5 pulse width
Pin Name
CKo0
CKo1
CKo2
CKo3
CKo4
CKo5
Table 3 - Output Timing Generation
4.096, 8.192, 16.384 or 32.768
Output Timing Rate
Zarlink Semiconductor Inc.
244, 122, 61 or 30
1.544 or 2.048
ZL50018
16.384
4.096
8.192
19.44
244
122
61
51
25
Output Timing Unit
MHz
MHz
MHz
MHz
MHz
MHz
ns
ns
ns
ns
ns
Data Sheet
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