PSB 2115
PSF 2115
Functional Description
Semiconductor Group
129
11.97
2.7.4
In IOM-2 mode, the MONITOR channel protocol is a handshake protocol used for high
speed information exchange between the IPAC and other devices in MONITOR channel
"0" or "1" (
see figure 53
). In the non-TE mode, only one MONITOR channel is available
("MONITOR channel 0").
The MONITOR channel protocol is necessary:
For programming and controlling the layer-1 part of the IPAC over MONITOR
channel 0. The layer 1 registers are not directly accessible to the host for read and
write accesses via the common register set.
For programming and controlling external devices attached to the IOM-2 interface
when the layer-1 part of the IPAC is disabled (CONF:TEM). Examples of such devices
are: layer-1 transceivers (using MONITOR channel 0), and peripheral V/D modules
(using MONITOR channel 1) that do not need a parallel microcontroller interface, such
as the Audio Ringing Codec Filter ARCOFI PSB 2163.
For data exchange between two microcontroller systems attached to two different
devices on one IOM-2 backplane. Use of the MONITOR channel avoids the necessity
of a dedicated serial communication path between the two systems. This greatly
simplifies the system design of terminal equipment (
figure 62
).
MONITOR Channel Handling
Figure 62
Examples of MONITOR Channel Applications in IOM
-2 TE Mode
The MONITOR channel operates on an asynchronous basis. While data transfers on the
bus take place synchronized to frame sync, the flow of data is controlled by a handshake
procedure using the MONITOR Channel Receive (MR0 or 1) and MONITOR Channel
Transmit (MX0 or 1) bits. For example: data is placed onto the MONITOR channel and
the MX bit is activated. This data will be transmitted repeatedly once per 8-kHz frame
until the transfer is acknowledged via the MR bit.
ITS09642
V/D-Module
-SP
ARCOFI
PSB 2163
Control (MONITOR1)
Data Communication
(MONITOR1)
C
μ
C
μ
R
IOM -2
R
V/D-Module
ITAC
R
PSB 2110
IPAC
PSB 2115