PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 49

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

3
Interfaces and functional blocks of the PEB/F 2091 V5.3 differ depending on the mode
used, i.e. depending on whether the stand-alone mode or the microprocessor mode is
being used.
Section 3.1 defines these two modes and gives an overview of device function.
As mentioned in section 1.1, page 19 the IEC-Q can be used in various functional
modes, including LT, NT, TE, Repeater and others. Section 3.2 gives an overview of
available modes, and describes how these modes can be set. In addition an overview is
given about setting special modes, e.g. test modes, and EOC Auto and Transparent
modes and different mode settings related to the IOM
In Section 3.3 device architecture is discussed. Block diagrams for both stand-alone and
microprocessor modes are illustrated.
Section 3.4 describes the architecture of the U-interface core (transceiver core). It
provides a brief description of its functions and properties.
The device’s interfaces defined in section 3.3 are described in the subsequent sections
3.5 through 3.14. All relevant functional information about these interfaces, especially
those related to user’s handling are given. The interaction between these interfaces,
however, is out of the scope of this section (e.g. operations between the IOM
U-interface). This is the scope of the chapter "Operational Description", page 96.
Section 3.15 gives an overview of the reset behavior of the IEC-Q.
3.1
The IEC-Q fulfills all U transceiver functions required by all national and international
standardization institutes. It also provides simple and flexible access to data and control
bits on the U-interface, activation and deactivation, monitoring transmission quality and
other useful general as well as application specific functions. This access can be
achieved using the IOM
both. If the microprocessor interface is not being used we refer to this mode as
’stand-alone mode’. This mode can be selected by leaving pin PMODE opened or setting
it to ’0’ (see "Mode Selection Pins", page 33). In stand-alone mode the PEB/F 2091 V5.3
is controlled exclusively via the IOM
below). In this mode a ’Power Controller Interface’ is available, allowing direct access to
e.g. peripheral power controller devices.
If the microprocessor interface (PI) is being used we refer to this mode as the ’µP mode’.
This mode can be selected by setting pin PMODE to ’1’ (see "Mode Selection Pins",
page 40). The PI of the PEB/F 2091 V5.3 establishes the access of a microprocessor
between U-interface and IOM
Semiconductor Group
Functional Description
Functional Overview
®
-2 interface, the microprocessor interface or a combination of
®
-2. It’s main function is illustrated in Figure 15.
®
-2 interface and mode selection pins (see Figure 15
49
®
-2 interface.
Functional Description
Data Sheet 01.99
PEB 2091
PEF 2091
®
-2 and the