pef20320 Infineon Technologies Corporation, pef20320 Datasheet - Page 156

• Manufacturer Part Number: pef20320
• Description: Multichannel Network Interface Controller For Hdlc With 32 Channels
• Manufacturer: Infineon Technologies Corporation

User’s Manual
– transmit initialization
3. Second Transmit Command Group
– Transmit HOLD
General Notes to Transmit Commands:
1. After a pulse at the reset pin a channel having a time slot with TTI = 0 should be
2. When it is supposed to be used it should be issued a transmit initialization command
3. To shut down a channel in transmit direction one should first set it into the transmit
TI = 1, TO = 0, TA = 1 (clears a previous transmit abort condition, affects the DMA
interface and the serial interface)
Before the MUNICH32 has got a transmit initialization command it will not transmit
anything properly in the channel. This command should therefore be the first channel
command after a pulse at the reset pin for a channel to be used.
FTDA is then the address of the starting point of the transmit descriptor for chaining
list. In this case the transmit initialize command should be accompanied by the NITBS
bit set and a reasonable value for ITBS (0 < ITBS < 64).
If the command is issued during normal operation it only affects the DMA. The
MUNICH32 stops processing of the current link list and branches to the transmit
descriptor at the FTDA address. The data stored in the TB are discarded and the TB
is filled with the data of the new descriptor.
TH; setting this bit causes the device to finish transmission of the current frame
(HDLC, TMB, TMR mode) the current data (TMA -mode) or leads to an abort with
3 frames with ‘0’-bits (V.110/X.30-mode). Afterwards
for
are sent until TH is withdrawn by a further action specification affecting the channel
specification of this channel.
Afterwards no further access to the TB from TF is done, therefore no further data are
fetched from the shared memory and the polling of a possible hold bit in the transmit
descriptor stops.
To send necessary frames/data before the transmit hold is active one should use the
proper procedure described under the transmit abort command.
issued transmit off commands and TH = 1 until it is supposed to be used.
and TH = 0 before using any other transmit channel commands (together with
NITBS = 1, ITBS
abort condition or use the TH bit with the proper procedure. One should leave it in
HDLC mode and IFTF = 1
HDLC mode and IFTF = 0
V.110/X.30-mode
TMA mode and FA = 1
TMA mode and FA = 0
TMB/TMR
0).
156
FF
7E
00
TFLAG fill characters
FF
00
H
H
H
H
H
fill characters
fill characters
fill characters
fill characters
fill characters
Detailed Register Description
PEB 20320
01.2000