psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 77

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

2.3.5
The layer-1 activation/deactivation can be controlled by an internal state machine via the
IOM-2 C/I0 channel or by software via the microcontroller interface directly. In the default
state the internal layer-1 state machine of the SCOUT-P(X) is used.
To disable the internal state machine TR_CONF0.L1SW must be set to ’1’ and a C/I code
TIM (’0000’) has to be programmed into CIX0.CODX0
If the internal state machine is disabled the layer-1 commands, which are normally
generated by the internal state machine can be written directly into the TR_CMD register
or indications read out of the TR_STA register. The SCOUT-P(X) layer-1 control flow is
shown in figure 40.
Figure 40
Layer-1 Control
2.3.5.1
In the following sections the layer-1 control by the SCOUT-P(X) state machine will be
described. For the description of the IOM-2 C/I0 channel see also chapter 2.2.5.
The layer-1 functions are controlled by commands issued via the CIX0 register. These
commands, sent over the IOM C/I channel 0 to layer 1, trigger certain procedures, such
as activation/deactivation, switching of test loops and transmission of special pulse
patterns. These are governed by a layer-1 state machine which agrees with the
activation/deactivation procedures as implemented in the SmartLink-P PSB 2197 or
ISAC-P TE PSB 2196 respectively. Responses from layer 1 are obtained by reading the
CIR0 register after a CIC interrupt (ISTA).
Data Sheet
Control of U
Internal Layer-1 Statemachine
Register
CIX0
CIR0
C/I
Command
C/I
Indication
PN
Microcontroller Interface
Layer-1 Control
Machine
Layer-1
State
Transmit
INFO
Receive
INFO
67
Command Register
(TR_CONF.L1SW)
Disable internal
Status Register
for Transmitter
Statemachine
of Receiver
(TR_CMD)
(TR_STA)
Transmitter
Receiver
layer1_ctl.vsd
PSB 21391
PSB 21393
Interfaces
2001-03-07