NSK70721PE.C2 Intel, NSK70721PE.C2 Datasheet - Page 58

• Manufacturer Part Number: NSK70721PE.C2
• Manufacturer: Intel

Specifications of NSK70721PE.C2

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Supplier Unconfirmed

SK70725/SK70721 — Enhanced Multi-Rate DSL Data Pump Chip Set
58
Figure 23. Micro-interruption as Defined in ETR-152
NT/LT
System manufacturers should determine the value for MIT which provides good recovery
performance in the test circumstances of interest. Larger values of MIT may be effective in some
circumstances, but not all. Since the ultimate performance is based on the nature of the signal
interruption and system characteristics outside the Data Pumps, it is not possible to specify an
optimum value for MIT for all systems and all data rates.
The EMDP stays in the Time-out state until the MIT expires. The MIT functions by counting baud
periods until the value stored in MITR is exceeded. The MIT is a 19 bit counter. The comparison is
carried out using only the 8 MSBs of the counter. Stated differently, the time represented by the
LSB of the MIT register is 2048 periods of the EMDP baud clock.
For example: When operating at 784 kbps, the length of one baud is 2.55 sec, 2048 x 2.55 ~ 5
msec, so MIT can be set in increments of approximately 5 msec. Setting MIT to 0 forces the micro-
interruption state to end approximately 5 msec after it began.
variety of data rates and desired timer expirations. The ability to set MIT register to a particular
value does not insure that the EMDP will be able to recover timing and resume operation after an
interruption of that duration.
MITR must be programmed before activating the data pump with the same value on both the
master and slave sides.
R = 810 ohms
C > 320 nF
t
R
Interruption Control
t = 10 ms, T = 5 s
C
For ETSI:
T
*Not part of the ETSI test - use line
simulator or RC Network
Simulator*
Line
Table 28
shows values of MIT for a
LT/NT
Datasheet