TXC-03303-ARPQ Transwitch Corporation, TXC-03303-ARPQ Datasheet - Page 47

• Manufacturer Part Number: TXC-03303-ARPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-03303-ARPQ

• Lead Free Status / RoHS Status: Compliant

Address
24
Bit
7
6
5
4
3
2
1
0
Symbol
AISC=0
AISX=1
TEST
TEST
TEST
TEST
SEF
DS3 AIS Detection: This bit provides a filtered indication of the receive
DS3 X-bits equal to one. Two counters are used to implement this filter, a
mod 16 counter CXE1 which counts the receive DS3 X-bit pairs=1, and a
mod 4 counter CXE0 which counts the receive DS3 X-bit pairs=0. When
either counter matures, both counters are reset. The AISX=1 bit becomes
latched when the CXE1 counter matures. This bit is used for determining if
the X-bits=1 condition is met when R3AIS2=0, R3AIS1=0, and R3AIS0=1 in
register 21H (ANSI DS3 defined AIS detection). This is a latched bit, and
clears when it is read by the microprocessor. This bit will relatch if the con-
dition that causes this bit to latch is still present.
DS3 AIS Detection: This bit provides a filtered indication of the receive
DS3 C-bits equal to zero. This bit will be set if the M13E receives 7 contigu-
ous DS3 frames with 30 or less DS3 C-Bits set to 1. This bit is used for
determining if the C Bits = 0 condition is met when R3AIS2 = 0 & R3AIS1 =
0 & R3AIS0 = X, where X means don’t care. This is a latched bit, and clears
when it is read by the microprocessor. This bit will relatch if the condition
that causes this bit to latch is still present.
Test Bit: Used for diagnostic purposes.
Test Bit: Used for diagnostic purposes.
Test Bit: Used for diagnostic purposes.
Test Bit: Used for diagnostic purposes.
Not Used.
Severely Errored Frame Indication: A one indicates a severely errored
frame has been detected. An SEF is defined as 3 out of 16 F-bits are in
error, utilizing a sliding window of 16 bits. This is a latched bit, and clears
when it is read by the microprocessor. This bit will relatch if the condition
that causes this bit to latch is still present.
- 47 -
Description
Ed. 4, August 1998
TXC-03303
TXC-03303-MB
M13E