txc-03456 TranSwitch Corporation, txc-03456 Datasheet - Page 88

• Manufacturer Part Number: txc-03456
• Description: Device Level Mapper
• Manufacturer: TranSwitch Corporation

Address
4C
4D
4A
4B
4E
4F
7-0
7-0
7-0
7-0
7-0
1-0
Bit
Justification
Justification
B3 Block
Negative
Symbol
Counter
Counter
Counter
Counter
Counter
Positive
Pointer
Desyn
Offset
NDF
B3 8-bit Block Error Counter: Counts the number of B3 blocks that are
received in error. Bit 0 is the LSB.
Positive Justification 8-bit Counter: Counts the number of positive justi-
fications based on the incoming J1 pulse. When the pointer tracking fea-
ture is enabled, counts the number of pointer increments. Bit 0 is the LSB.
Negative Justification 8-bit Counter: Counts the number of negative
justifications based on the incoming J1 pulse. When the pointer tracking
feature is enabled, counts the number of pointer decrements. Bit 0 is the
LSB.
New Data Flag 8-bit Counter. Enabled when a high is placed on PTEN
(pin2), the pointer tracking feature. Counts the number of received NDF
(1001, 0001, 1101, 1011, and 1000) detected in bits 1-4 of H11. This
counter does not count the NDF in the AIS to NDF state transition of the
pointer tracking state machine.
Desynchronizer Pointer Offset Counter: A 9-bit counter, plus a sign bit,
that provides the count of the internal pointer offset counter (i.e., pointer
leak buffer offset counter, which is the number of bits that have to be
leaked out if the sign bit is 0, or the number of leak times not to leak out a
bit if the sign bit is 1) for a microprocessor read cycle, when required. The
MSB bit is located in bit 0 in 4FH, followed by bit 7 in 4EH. The sign bit is
located in bit 1 in 4FH. The value provided is in the 2's complement form,
with a zero value equal to 0. This counter can be used in setting the FLR
registers. Further information on this subject is provided in a TranSwitch
Application Note, document number TXC-03456-0001-AN, Ed. 1,
February 7, 1995.
DATA SHEET
- 88 -
Description
Ed. 1A, January 2000
TXC-03456
TXC-03456-MB
L4M