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PEF2015 Datasheet(PDF) 31 Page - Infineon Technologies AG

Part # PEF2015
Description  ICs for Communications
PDF  84 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

PEF2015 Datasheet(HTML) 31 Page - Infineon Technologies AG

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PEF 2015
Operational Description
Semiconductor Group
31
12.97
CFI-port, time slot 2 (even), downstream
MADR
=
FFH ; the C/I-value '1111' will be transmitted upon CFI-activation
MAAR
=
08H ; addresses ts 2 down
MACR
=
7AH ; CM-code '1010'
Wait for STAR:MAC = 0
CFI-port, time slot 3 (odd), downstream
MADR
=
FFH ; don’t care
MAAR
=
09H ; addresses ts 3 down
MACR
=
7BH ; CM-code '1011'
Wait for STAR:MAC = 0
CFI-port, time slot 2 (even), upstream
MADR
=
FFH ; the C/I-value '1111' is expected upon CFI-activation
MAAR
=
88H ; address ts 2 up
MACR
=
78H ; CM-code '1000'
Wait for STAR:MAC = 0
CFI-port, time slot 3 (odd), upstream
MADR
=
FFH ; don’t care
MAAR
=
89H ; address ts 3 up
MACR
=
70H ; CM-code '0000'
Wait for STAR:MAC = 0
Repeat the above programming steps for the remaining CFI-time slots.
This procedure can be speeded up by selecting the CM-initialization mode
(OMDR:OMS1..0=10). If this selection is made, the access time to a single memory
location is reduced to 2.5 RCL-cycles. The complete initialization time for 8 IOM-2
channels is then reduced to 32
× 0.61 µs = 19,5 µs
3.5.2.4
Initialization of the Upstream Data Memory (DM) Tristate Field
For each PCM time slot the tristate field defines whether the contents of the DM-data
field are to be transmitted (low impedance), or whether the PCM time slot shall be set to
high impedance. The content of the tristate field is not modified by a hardware reset. In
order to have all PCM time slots set to high impedance upon the activation of the PCM-
interface, each location of the tristate field must be loaded with the value '0000'. For this
purpose, the "tristate reset" command can be used:
OMDR =
C0H ; OMS1..0 = 11, normal mode
MADR
=
00H ; code field value '0000'B
MACR
=
68H ; MOC-code to initialize all tristate locations (1101B)
Wait for STAR:MAC = 0



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