DS33R11 Maxim Integrated Products, DS33R11 Datasheet - Page 48
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DS33R11
Manufacturer Part Number
DS33R11
Description
Network Controller & Processor ICs Ethernet Mapper with Integrated T1-E1-J1
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R11.pdf
(344 pages)
Specifications of DS33R11
Product
Framer
Number Of Transceivers
1
Supply Voltage (max)
1.89 V, 3.465 V
Supply Voltage (min)
1.71 V, 3.135 V
Supply Current (max)
100 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Package / Case
BGA
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DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
9.6 Device Interrupts
Figure 9-2
diagrams the flow of interrupt conditions from their source status bits through the multiple levels of
information registers and mask bits to the interrupt pin. When an interrupt occurs, the host can read the Global
Latched Status registers GL.LIS, GL.SIS, GL.BIS, and
GL.TRQIS
to initially determine the source of the interrupt.
The host can then read the LI.TQCTLS, LI.TPPSRL, LI.RPPSRL, LI.RX86S, SU.QCRLS, or BSRL registers to
further identify the source of the interrupt(s). In order to maintain software compatibility with the multiport devices in
the product family, the global interrupt status and interrupt enable registers have been preserved, but do not need
to be used. If GL.TRQIS is determined to be the interrupt source, the host will then read the LI.TPPSRL and
LI.RPPSRL registers for the cause of the interrupt. If GL.LIS is determined to be the interrupt source, the host will
then read the LI.TQCTLS, LI.TPPSRL, LI.RPPSRL, and LI.RX86S registers for the source of the interrupt. If
GL.SIS is the source, the host will then read the SU.QCRLS register for the source of the interrupt. If GL.BIS is the
source, the host will then read the BSRL register for the source of the interrupt. All Global Interrupt Status Register
bits are real-time bits that will clear once the appropriate interrupt has been serviced and cleared, as long as no
additional, enabled interrupt conditions are present in the associated status register. All Latched Status bits must
be cleared by the host writing a “1” to the bit location of the interrupt condition that has been serviced. In order for
individual status conditions to transmit their status to the next level of interrupt logic, they must be enabled by
placing a “1” in the associated bit location of the correct Interrupt Enable Register. The Interrupt enable registers
are LI.TPPSRIE, LI.RPPSRIE, LI.RX86LSIE, BSRIE, SU.QRIE, GL.LIE, GL.SIE, GL.BIE, and GL.TRQIE. Latched
Status bits that have been enabled via Interrupt Enable registers are allowed to pass their interrupt conditions to
the Global Interrupt Status Registers. The Interrupt enable registers allow individual Latched Status conditions to
generate an interrupt, but when set to zero, they do not prevent the Latched Status bits from being set. Therefore,
when servicing interrupts, the user should AND the Latched Status with the associated Interrupt Enable Register in
order to exclude bits for which the user wished to prevent interrupt service. This architecture allows the application
host to periodically poll the latched status bits for noninterrupt conditions, while using only one set of registers.
Note the bit-orders of SU.QRIE and SU.QCRLS are different.
Note that the inactive state of the interrupt output pin is configurable. The INTM bit in
GL.CR1
controls the inactive
state of the interrupt pin, allowing selection of a pull-up resistor or active
driver.
The interrupt structure is designed to efficiently guide the user to the source of an enabled interrupt source. The
latched status bits for the interrupting entity must be read to clear the interrupt. Also reading the latched status bit
will reset all bits in that register. During a reset condition, interrupts cannot be generated. The interrupts from any
source can be blocked at a global level by the placing a zero in the global interrupt enable registers (GL.LIE,
GL.SIE, GL.BIE, and GL.TRQIE). Reading the Latched Status bit for all interrupt generating events will clear the
interrupt status bit and Interrupt signal will be de-asserted.
Note that the integrated T1/E1/J1 transceiver also generates interrupts, as discussed in Section 10.3.
48 of 344
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