DS21458-W+ Maxim Integrated, DS21458-W+ Datasheet - Page 116
DS21458-W+
Manufacturer Part Number
DS21458-W+
Description
Network Controller & Processor ICs
Manufacturer
Maxim Integrated
Datasheet
1.DS21458-W.pdf
(269 pages)
Specifications of DS21458-W+
Product
Framer
Number Of Transceivers
4
Data Rate
64 Kbps
Supply Current (max)
328 mA
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
CSBGA
Minimum Operating Temperature
0 C
Operating Supply Voltage
3.3 V
Supply Voltage - Max
3.465 V
Supply Voltage - Min
3.135 V
Part # Aliases
90-21458+W00
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DS21455/DS21458 Quad T1/E1/J1 Transceivers
20. ELASTIC STORES OPERATION
The DS21455/DS21458 contain dual two-frame, fully independent elastic stores, one for the receive
direction and one for the transmit direction. The transmit- and receive-side elastic stores can be
enabled/disabled independent of each other. Also, each elastic store can interface to either a 1.544MHz or
2.048MHz/4.096MHz/8.192MHz/16.384MHz backplane without regard to the backplane rate to which
the other elastic store is interfacing.
The elastic stores have two main purposes. First, they can be used for rate conversion. When the device is
in the T1 mode, the elastic stores can rate-convert the T1 data stream to a 2.048MHz backplane. In E1
mode, the elastic store can rate-convert the E1 data stream to a 1.544MHz backplane. Second, they can be
used to absorb the differences in frequency and phase between the T1 or E1 data stream and an
asynchronous (not locked) backplane clock (which can be 1.544MHz or 2.048MHz). In this mode, the
elastic stores will manage the rate difference and perform controlled slips, deleting or repeating frames of
data in order to manage the difference between the network and the backplane.
The elastic stores can also be used to multiplex T1 or E1 data streams into higher backplane rates. See the
Interleaved PCM Bus Operation section.
116 of 269
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