Lattice Semiconductor
Multi-Channel DMA Controller User’s Guide
Figure 2. MCDMA Finite State Machine for 8237 and Non-8237 Modes
No REQ
SI
Request
LAST_TRAN/
SINGLE_TRAN
Termination
Dropped
Illegal
Mode
S0
No HDLA
Illegal
I/O Mode
(8237 only)
LAST_TRAN/
SINGLE_TRAN
Termination
Not LAST_TRAN
NR
S24
S1/S11
MEM-MEM
Not Ready (NR)
I/O-MEM
NR
NR
S23
S12
S2
Write
Phase
NR
S22
S13
NR
Read
Phase
S3
NR
NR
S21
S14
NR
S4
6
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