peb20320 Infineon Technologies Corporation, peb20320 Datasheet - Page 219
peb20320
Manufacturer Part Number
peb20320
Description
Multichannel Network Interface Controller For Hdlc
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20320.pdf
(252 pages)
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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).
219
Application Notes
PEB 20320
01.2000
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