txc-03456 TranSwitch Corporation, txc-03456 Datasheet - Page 68

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

Address
10
Bit
0
Symbol
ADDZ
Add Bus Force High Impedance State: Works in conjunction with the
control bit FBTOZ for controlling the add bus signal states. Assuming
that there is no drop or add bus alarms, the following states are possible:
ADDZ
When there is an alarm for the clock that sources the add bus data, the
operation in the table below occurs:
0
0
1
1
ADDZ
0
0
1
1
FBTOZ
FBTOZ
0
1
0
1
0
1
0
1
DATA SHEET
- 68 -
Add Bus data
forced to Hi-Z
state. ADD=1.
Add Bus data
forced to 0 state.
ADD=0.
Add Bus data is
forced to Hi-Z
state. ADD=1.
Add Bus data
and ADD are
forced to the 0
state.
Normal operation. Unused bytes (TOH and POH
bytes when disabled) are transmitted in the high
impedance state.
Normal operation. Unused bytes (TOH and POH
bytes when disabled) are transmitted as 0s. ADD
is forced to 0.
All add bus bytes (time slots) forced to the high
impedance state. Note: when add bus timing is
selected, data only will be forced to the high
impedance state. The C1J1 and SPE signals are
inputs. In the other two timing modes, add bus
and external timing modes, the add bus clock
(ACLK), SPE indicator, C1J1 will be forced to 0.
ADD is forced to 1.
All add bus Bytes (time slots) forced to the zero
state. Note: when add bus timing is selected, data
only will be forced to the zero state. The C1J1 and
SPE signals are inputs. In the other two timing
modes, add and external, the add bus clock, SPE,
C1J1 will be forced to 0. ADD is forced to 0.
ADD Bus
Action
Description
Add Bus data is
forced to its Hi-Z
state. ASPE, ACLK,
AC1J1 forced to 0.
ADD=1.
Add Bus data is
forced to 0 state.
ASPE, AC1J1, ACLK,
ADD are forced to 0
state.
Add Bus data is
forced to Hi-Z state.
ASPE, ACLK, AC1J1
forced to 0. ADD=1.
Add Bus data is
forced to 0 state.
ACLK, ASPE, AC1J1,
and ADD are forced
to 0.
Action for Timing Modes
DROP Bus
Add Bus data is
forced to its Hi-Z
state. ASPE, ACLK,
AC1J1 forced to 0.
ADD=1.
Add Bus data is
forced to 0 state.
ASPE, AC1J1, ACLK,
ADD are forced to 0
state.
Add Bus data is
forced to Hi-Z state.
ASPE, ACLK, AC1J1
forced to 0. ADD=1.
Add Bus data is
forced to 0 state.
ACLK, ASPE, AC1J1,
and ADD are forced
to 0.
Ed. 1A, January 2000
External
TXC-03456
TXC-03456-MB
L4M