Functional Description
2.2.2
IOM®-2 Interface Mode (ADF2:IMS=1)
In this mode the IOM interface has the enhanced functionality of IOM-2. B-channel interfacing
is performed directly via the IOM-2 interface and the auxiliary serial SSI and SLD interfaces
are not longer available (as in IOM-1 mode), since they are functionally replaced by the general
purpose IOM-2 interface.
The Serial Port Timing Mode (SPCR:SPM) defines the operating mode of the IOM-2 interface
i.e. either the terminal mode frame structure (3 channels) or the non-terminal frame structure
(8 channels) can be selected (see chapter 2.4.1).
The serial port timing mode must be set in accordance to the operating mode, i.e. the TE mode
requires the terminal timing mode and LT-S/LT-T modes require non-terminal timing-mode.
In NT mode the IOM frame structure is identical to that of the IOM-1 case (1 channel) and the
non-terminal timing mode must be selected.
The operating modes are shown in table 2.
Table 2
Operating Modes and Functions of Mode Specific Pins of the ISAC®-S PEB 2085/86 in
IOM®-2 Mode
Pin No.
P-DIP-40
(PEB 2085
only)
14 18
11
12
13
19
15
17
16
Pin No.
P-LCC-44
15 21
61 6
12
58
13
59
14
60
22
7
16
62
20
5
19
Pin No.
–
P-MQFP-64
(PEB 2086
only)
Application
TE
M1 M0
DCL
FSC1
FSC2
CP
X2
X1
X0
0
0
1
1
0
1
0
1
o:1536 kHz* o:8 kHz*
o:PU1
i:8 kHz
i:8 kHz
i:8 kHz
o:768 kHz*
o:512 kHz*
i:o
o:ECHO/M**
o:PU0
i:CON
i:CON
i:o
LT-T
i:4096 kHz
i:4096 kHz
i:512 kHz
i:8 kHz
i:8 kHz
i:8 kHz
i:o
i:o
LT-S
i:o
o:7680 kHz
i:o
NT
i:SCZ
i:SSZ
–
*) synchronized to the S/T interface
i:input
o:output
i:o : input to be fixed at "0"
ECHO/M The value of the M-bit is output, multiplexed with the value of the Echo-bits on the
IOM-interface.
Reproduces the E-bits received from the S interface synchronously to IOM frame
"D"-bits (bit positions 24 and 25 of the IOM frame). All other bit positions, except the
M-bit are binary "1".
Semiconductor Group
36
INFINEON [ Infineon ]
