TXC-04222-AIOG Transwitch Corporation, TXC-04222-AIOG Datasheet - Page 52

• Manufacturer Part Number: TXC-04222-AIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-04222-AIOG

• Screening Level: Industrial
• Package Type: BGA
• Lead Free Status / Rohs Status: Not Compliant

June 2003
TEMx28
TXC-04222
TXC-04222-MB, Ed. 6
BUS MODE SELECTION
The TU/VT bus mode selection is performed by the control bits defined in the table shown below. The n repre-
sents the channel number (1-28). Note: Both the A and B Add buses upon power up and reset are in the high
impedance state. A 0 must be written to control bits AAHZE (bit 1, 03AH) and BAHZE (bit 2, 03AH) for normal
add bus operation.
SDH/SONET ADD/DROP MULTIPLEXING FORMAT SELECTIONS
The control bit settings for the SONET/SDH mapping format selection are given in the table shown below. This
selection is valid for both the A and B Drop and Add buses. A Drop Bus Reset operation should be performed
after modifying the STS-3 bit. See DRESET bit at address 039H in the Memory Map Description.
Dropping only, from A
Dropping only, from B
Single unidirectional ring
Single unidirectional ring
Multiplexer, A in, B out
Multiplexer, B in, A out
Dual unidirectional ring
Dual unidirectional ring
Notes:
1. When the drop-only mode is selected, the ability to add a TU/VT is disabled, and the add bus is tristated.
2. Writing a 1 to control bit FnRDIS (bit 3, X+006H) causes the REI value to always be transmitted as zero. In addi-
tion, receive side alarms are disabled from generating RDI and RDI is transmitted as zero. However, the micro-
processor can send an RDI, if required.
Mode Type
Proprietary TranSwitch Corporation Information for use Solely by its Customers
STS-3 Format or STM-1 AU-3 Format
STM-1 VC4 Format
2
2
(bit 1, X+006H)
TnSEL1
STS-3 STS-1/STM-1 VC-4 Format Selection
0
0
0
0
1
1
1
1
Bus Mode Selection for Channel n
DATA SHEET
(bit 0, X+006H)
Format
TnSEL0
0
0
1
1
0
0
1
1
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(bit 2, X+006H)
RnSEL
0
1
0
1
0
1
0
1
DROP from Bus
(bit 1, 01AH)
STS3
A
B
A
B
A
B
A
B
1
0
Drop-only (1)
Drop-only (1)
ADD to Bus
A and B
B and A
A
B
B
A