TXC-04222-AIOG Transwitch Corporation, TXC-04222-AIOG Datasheet - Page 57

• 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

mask bits when set to 1, enable the global polling indication bits. Also shown in Figure 29 are the drop and add
bus alarm locations and their corresponding mask bits for setting the three global bus indication bits. For exam-
ple, if an upstream AIS indication is detected in A drop bus for STS-3 STS-1 No. 1, and the corresponding
mask bit is set, a global indication is also set.
As shown in Figure 28, each of the alarms has a corresponding mask bit in each channel. These correspond to
the add side alarms (e.g., line AIS detected), A drop VT/TU alarms (e.g., NDF alarm detected), and B drop
VT/TU alarms (e.g., LOP alarm detected). When the corresponding mask bit is set to 1, the alarm sets a bit in
one of the three polling registers corresponding to the channel. In addition, there is a set of mask bits which
can inhibit an alarm type from setting one or more channel bits in a polling register. For example, an
unequipped alarm that occurs in any channel can be masked from setting that channels polling bit register
location.
The interrupt is cleared by reading the latched alarm bit position, or by setting the appropriate mask bits to 0.
Please note: it will take approximately 4 microseconds before the interrupt will change states when an alarm
mask bit is enabled (turned off).
Proprietary TranSwitch Corporation Information for use Solely by its Customers
Mask Bits A Drop Alarms
Mask Bits per Alarm Type
Mask Bits B Drop Alarms
A Drop Latched Alarms
B Drop Latched Alarms
Mask Bits Add Alarms
(X+013H to X+016H)
(X+194H to X+197H)
(X+083H to X+086H)
(X+114H to X117H)
Add Latched Alarms
(007H to 00AH)
Channel n
Channel n
Channel n
Channel n
Channel n
Channel n
(X+101H)
(X+005H)
Figure 28. Channel Polling Alarms
n Alarms
Mask Bits
n Alarms
Mask Bits
n Alarms
Mask Bits
n Alarms
n Alarms
n Alarms
DATA SHEET
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AND
AND
AND
Bit
Bit
Bit
Channel n
Channel n
Channel n
Channel n Polling
Channel n Polling
Channel n Polling
A Drop Alarms
B Drop Alarms
(094H - 097H)
(055H - 058H)
(74H - 77H)
Add Alarms
TXC-04222-MB, Ed. 6
TXC-04222
TEMx28
June 2003