peb3456 Infineon Technologies Corporation, peb3456 Datasheet - Page 163

• Manufacturer Part Number: peb3456
• Description: Channelized T3 Termination With Ds3 Framer, M13 Multiplexer, T1/ E1 Framers And 256 Channel Hdlc/ppp Controller
• Manufacturer: Infineon Technologies Corporation

in Table 6-1.
Before initializing a channel the time slot assignment process for the affected channel
must be completed. Vice versa after shutting down a channel the time slots associated
with the affected channel should be set to inhibit. Otherwise if a time slot is
reprogrammed afterwards, strange behavior can be expected on the serial side.
For each channel a simple sequence of channel commands must be ensured. After reset
each channel is in its ’off’ state. Therefore, the first command to start a channel is
’Transmit Init’ or ’Receive Init’. This brings the channel into the operational state. In this
state all commands except ’Transmit Init’, ’Receive Init’ or ’Transmit Idle can be given.
To bring a channel back into the idle state a ’Transmit Off’ or ’Receive Off’ command has
to be programmed. For certain channel commands system software has to wait before
new commands can be given for the same channel. This is due to internal buffer
allocation functions which require some processing time. Notification of system software
is done in form of command interrupt vectors, which signal that a command has
successful or even unsuccessful completed.
Table 6-1
Register
6
For channel programming the TE3-CHATT provides a on-chip channel specification data
structure. All information necessary to setup a channel has to be provided using this data
structure. As soon as all channel information has been written to the channel
specification registers the information can be released using simple channel commands,
which have to be written to register CSPEC_CMD. The relevant channel information will
then be copied to the chip internal channel database. The channel specification
registers, which need to be programmed before a command can be executed, are shown
CSPEC_MODE_REC
CSPEC_REC_ACCM
CSPEC_MODE_XMIT
Data Sheet
Channel Programming / Reprogramming Concept
Channel Specification Registers and Channel Commands
Channel Programming / Reprogramming Concept
Transmit Commands
163
Receive
Commands
PEB 3456 E
05.2001