CD2231 Intel Corporation, CD2231 Datasheet - Page 44

• Manufacturer Part Number: CD2231
• Description: CD2231 Intelligent Two-channel Lan And Wan Communications Controller
• Manufacturer: Intel Corporation

CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
5.4.3
44
Figure 5. Bus Acquisition Cycle
Figure 6. Data Transfer Timing
DATDIR*
BGACK*
DTACK*
ADLD*
Bus Error Handling
When a bus error is detected during a DMA sequence, the CD2231 terminates the current bus cycle
and relinquishes the bus. Any data transfer in the bus ownership cycle is ignored, and the original
conditions are restored. A subsequent retry attempt would start again from these original
conditions.
BGIN*
AEN*
R/W*
BR*
AS*
DS*
bus and gives it up here.
Someone else owns the
The CD2231 owns the bus at this point.
High for MEM read
Low for MEM write
High for MEM read
Low for MEM write
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