peb3456 Infineon Technologies Corporation, peb3456 Datasheet - Page 164

• 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

CSPEC_XMIT_ACCM
Transmit Init
Before a ’Transmit Init’ command is given, the TE3-CHATT will not transmit data for a
channel. After the ’Transmit Init’ command the channel database of the affected channel
is initialized according to the parameters in the channel specification registers.
After initialization the transmit buffer prepares the buffer locations for the selected
channel and the data management unit starts processing the linked list and fills the
prepared buffer locations. In order to prevent a transmit underrun condition, the transmit
buffer is filled up to the transmit forward threshold before data is sent to the serial side.
The protocol machine formats data according to the given channel parameters and the
data is placed in the time slots assigned to the selected channel. When no or not
sufficient data is available, the device sends the idle code according the selected
protocol mode.
If the command was successful, a ’Transmit Command Complete’ interrupt vector is
generated after the first transmit descriptor is read pointed to by register CSPEC_FTDA.
In case that there is insufficient transmit buffer space, the command cannot be
Register
CSPEC_BUFFER
CSPEC_FRDA
CSPEC_FTDA
CSPEC_IMASK
6.1
The following section describes all receive and transmit channel commands and the
programming sequence in details.
6.2
Data Sheet
Channel Commands
Transmit Channel Commands
Channel Programming / Reprogramming Concept
Transmit Commands
164
Receive
Commands
PEB 3456 E
05.2001