DS33R11 Maxim Integrated Products, DS33R11 Datasheet - Page 108
DS33R11
Manufacturer Part Number
DS33R11
Description
Network Controller & Processor ICs Ethernet Mapper with Integrated T1-E1-J1
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R11.pdf
(344 pages)
Specifications of DS33R11
Product
Framer
Number Of Transceivers
1
Supply Voltage (max)
1.89 V, 3.465 V
Supply Voltage (min)
1.71 V, 3.135 V
Supply Current (max)
100 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Package / Case
BGA
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Figure 10-14. Optional Crystal Connections
10.25 T1/E1/J1 TRANSCEIVER BERT FUNCTION
The BERT block can generate and detect pseudorandom and repeating bit patterns. It is used to test and stress
data communication links, and it is capable of generating and detecting the following patterns:
The BERT receiver has a 32-bit bit counter and a 24-bit error counter. The BERT receiver reports three events: a
change in receive synchronizer status, a bit error being detected, and if either the bit counter or the error counter
overflows. Each of these events can be masked within the BERT function through the BERT control register 1
(TR.BC1). If the software detects that the BERT has reported an event, then the software must read the BERT
information register (BIR) to determine which event(s) has occurred. To activate the BERT block, the host must
configure the BERT mux through the TR.BIC register.
10.25.1 BERT Status
TR.SR9 contains the status information on the BERT function. The host can be alerted through this register when
there is a BERT change-of-state. A major change-of-state is defined as either a change in the receive
synchronization (i.e., the BERT has gone into or out of receive synchronization), a bit error has been detected, or
an overflow has occurred in either the bit counter or the error counter. The host must read status register 9
(TR.SR9) to determine the change-of-state.
10.25.2 BERT Mapping
The BERT function can be assigned to the network direction or backplane direction through the direction control bit
in the BIC register (TR.BIC.1). See
channel basis. The BERT transmit control selector (BTCS) and BERT receive control selector (BRCS) bits of the
per-channel pointer register (TR.PCPR) are used to map the BERT function into time slots of the transmit and
receive data streams. In T1 mode, the user can enable mapping into the F-bit position for the transmit and receive
directions through the RFUS and TFUS bits in the BERT interface control (TR.BIC) register.
The pseudorandom patterns 2E7, 2E11, 2E15, and QRSS
A repetitive pattern from 1 to 32 bits in length
Alternating (16-bit) words that flip every 1 to 256 words
Daly pattern
NOTE: C1 AND C2 SHOULD BE 5pF LOWER THAN TWO TIMES THE NOMINAL LOADING CAPACITANCE
OF THE CRYSTAL TO ADJUST FOR THE INPUT CAPACITANCE OF THE DEVICE.
XTALD
Figure 10-15
MCLK
and
108 of 344
C1
Figure
10-16. The BERT also can be assigned on a per-
C2
1.544MHz/2.048MHz
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