PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 94
PEF2091
Manufacturer Part Number
PEF2091
Description
ICs for Communications(ISDN Echocancellation Circuit)
Manufacturer
Siemens Semiconductor Group
Datasheet
1.PEF2091.pdf
(298 pages)
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reached. This is independent of mode setting. However there is a difference in reset
duration and indication between the stand-alone mode and the microprocessor mode.
In stand-alone mode this internal reset (POR) will be fully equivalent to the hardware
reset generated by activating the pin RES. The duration of the reset pulse will be some
value between 10 and 30 µs.
The processor mode (PMODE="1") has two additional properties:
-
-
The duration of POR in this mode will be some value between 60 and 70 ms.
3.15
Several resets are provided in the IEC-Q (see chapters 3.12, 3.13 and 3.14 above). Their
effects are summarized in Table 13.
Definition
The transceiver core is said to be reset if the Receiver coefficients, the awake unit, the
Monitor Channel procedure and the state machine are reset.
Table 13
Reset
Power-On
UVD
Hardware
Reset
Watchdog
Software
Reset
1) Applies only in the microprocessor mode
2) In all IOM
The POR will be given on the pin RST
The POR will also reset the register STCR. See "STCR-Register", page 212.
IEC-Q
®
-2 slave modes this reset will be carried out only after the IOM
Reset Behavior
Reset
Condition
Power-on
Power
supply drop
Pin RES = 0
Watchdog
expired
C/I = 0001
Effect
Resets the transceiver core
Resets all registers in the
microprocessor mode
Resets the transceiver core
Resets all registers in the
microprocessor mode
Resets the transceiver core
Resets all registers except for
register STCR in the microprocessor
mode
No internal effect
Resets the transceiver core
94
2)
2)
2)
.
.
.
®
-2 clocks has been applied to the
Functional Description
Pin RST active
yes
yes
no
yes
no
Data Sheet 01.99
PEB 2091
PEF 2091
1)
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