TXC-04252AIPQ Transwitch Corporation, TXC-04252AIPQ Datasheet - Page 106

• Manufacturer Part Number: TXC-04252AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-04252AIPQ

• Pin Count: 160
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

Ed. 3, December 2000
QE1M
TXC-04252
TXC-04252-MB
COMMON REGISTERS - CONTROL DESCRIPTIONS
Note 1: The add bus will be forced to a high impedance state automatically when loss of clock is detected on the
Address
010
transmit clock signal selected by control bit DBPBT.
Bit
Proprietary TranSwitch Corporation Information for use Solely by its Customers.
7
6
5
4
3
2
1
0
Symbol
AAHZE
BAHZE
BLOCK
MOD1
MOD0
NPIC
NPIA
NPIB
Format Selection: The format selection is made according to the table
given below.
MOD1
A Add Bus High Impedance Enable: A 1 forces the A-side add bus
data output to a high impedance state. Upon power-up, or on a hardware
or software reset, this bit is set to a 1. Note: For normal bus operation
this bit position must be written with a 0. See Note 1.
B Add Bus High Impedance Enable: A 1 forces the B-side add bus
data output to a high impedance state. Upon power-up, or on a hardware
or software reset, this bit is set to a 1. Note: For normal bus operation
this bit position must be written with a 0. See Note 1
Block Count: A 1 enables two BIP-2 errors to be counted as a single
error (block) for the BIP-2 performance counters (V5 and K4 (Z7) bytes).
A 0 enables two BIP-2 errors to be counted as two errors.
Null Pointer Indicator Selection: A 1 enables a null pointer indicator to
be generated for the corresponding TUG-3 when control bits MOD1 and
MOD0 are a 1 (STM-1/TUG-3/VC-4 format). A null pointer indicator is
carried in the first three bytes of column 1 in a TUG-3. The null pointer
indicator byte values are 93H, E0H and 00H. A 0 forces the NPI byte
position to a high impedance state on the A/B buses.
0
0
1
1
DATA SHEET
MOD0
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0
1
0
1
Format Selected
STS-1 Format
STS-3 Format
STM-1/AU-3 Format
STM-1/TUG-3/VC-4 Format
Description