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DS2155 Datasheet(PDF) 42 Page - Dallas Semiconductor

Part # DS2155
Description  T1/E1/J1 Single-Chip Transceiver
PDF  238 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2155 Datasheet(HTML) 42 Page - Dallas Semiconductor

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6.4 Information Registers
Information registers operate the same as status registers except they cannot cause interrupts. They are all
latched except for INFO7 and some of the bits in INFO5 and INFO6. INFO7 register is a read-only
register. It reports the status of the E1 synchronizer in real time. INFO7 and some of the bits in INFO6
and INFO5 are not latched and it is not necessary to precede a read of these bits with a write.
6.5 Interrupt Information Registers
The interrupt information registers provide an indication of which status registers (SR1 through SR9) are
generating an interrupt. When an interrupt occurs, the host can read IIR1 and IIR2 to quickly identify
which of the nine status registers are causing the interrupt.
Register Name:
IIR1
Register Description:
Interrupt Information Register 1
Register Address:
14h
Bit #
7
6
5
4
3
2
1
0
Name
SR8
SR7
SR6
SR5
SR4
SR3
SR2
SR1
Default
0
0
0
0
0
0
0
0
Register Name:
IIR2
Register Description:
Interrupt Information Register 2
Register Address:
15h
Bit #
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
U_RSR
SR9
Default
0
0
0
0
0
0
0
0



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