pef20320 Infineon Technologies Corporation, pef20320 Datasheet - Page 219

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

3. The final method is to set the HOLD bit in the Tx descriptor. When the HOLD bit in the
User’s Manual
Tx descriptor is set, the MUNICH32 checks the status of the this bit for each time slot
assigned to this channel. In this way, if the bit has been cleared, the MUNICH32 will
immediately resume transmission. Although this method is simpler (in concept) for the
software design, it causes the MUNICH32 to consume higher than normal bus
bandwidth. For this reason, this is the least desirable of the three methods. In the
previous example discussed, if all 32 channels were holding on the Tx descriptors,
bus occupancy might rise as high as 17%. The reason bus occupancy rises this
dramatically is due to the bus access once per time slot rather than once every four
time slots (typical).
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Application Notes
PEB 20320
01.2000