DS26524DK Maxim Integrated Products, DS26524DK Datasheet - Page 57
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DS26524DK
Manufacturer Part Number
DS26524DK
Description
KIT DESIGN FOR DS26524
Manufacturer
Maxim Integrated Products
Datasheet
1.DS26524G.pdf
(273 pages)
Specifications of DS26524DK
Main Purpose
Telecom, Framer and Line Interface Units (LIUs)
Utilized Ic / Part
DS26524
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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8.9.7.1 Status and Information Bit Operation
When a particular event has occurred (or is occurring), the appropriate bit in one of these registers is set to 1.
Status bits can operate in either a latched or real-time fashion. Some latched bits can be enabled to generate a
hardware interrupt via the INTB signal.
8.9.7.1.1 Real-Time Bits
Some status bits operate in a real-time fashion. These bits are read-only and indicate the present state of an alarm
or a condition. Real-time bits remain stable and valid during the host read operation. The current value of the
internal status signals can be read at any time from the real-time status registers without changing any the latched
status register bits.
8.9.7.1.2 Latched Bits
When an event or an alarm occurs and a latched bit is set to 1, it remains set until cleared by the user. These bits
typically respond on a change-of-state for an alarm, condition, or event, and operate in a read-then-write fashion.
The user should read the value of the desired status bit and then write a 1 to that particular bit location to clear the
latched value (write a 0 to locations not to be cleared). Once the bit is cleared, it is not set again until the event has
occurred again.
8.9.7.1.3 Mask Bits
Some of the alarms and events can be either masked or unmasked from the interrupt pin via the Receive Interrupt
Mask registers (RIM1:RIM7). When unmasked, the INTB signal is forced low when the enabled event or condition
occurs. The INTB pin is allowed to return high (if no other unmasked interrupts are present) when the user reads
and then clears (with a write) the alarm bit that caused the interrupt to occur. Note that the latched status bit and
the INTB pin clear even if the alarm is still present.
Note that some conditions can have multiple status indications. For example, receive loss of frame (RLOF)
provides the following indications:
RRTS1.0
(RLOFD)
(RLOFC)
(RLOF)
RLS1.0
RLS1.4
Real-time indication that the receiver is not synchronized with
incoming data stream. Read-only bit that remains high as long as
the condition is present.
Latched indication that the receiver has lost synchronization since
the bit was last cleared. Bit clears when written by the user, even
if the condition is still present (rising edge detect of RRTS1.0).
Latched indication that the receiver has reacquired
synchronization since the bit was last cleared. Bit clears when
written by the user, even if the condition is still present (falling
edge detect of RRTS1.0).
57 of 273
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