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Lattice Semiconductor
Multi-Channel DMA Controller User’s Guide
Table 4. Signal De?nitions of the MCDMA Controller (Continued)
aen
Port Name
Type
Output
Active State
High
Description
Address Enable . This active high signal enables the 8-bit
latch that contains the upper 8 address bits onto the system
address bus.
aout [ADDR_BUS_WIDTH-1:0]
Output
N/A
Address Output . These lines are enabled only during active
DMA transfer and contain the memory address.
dack[N-1:0]
Output
High/Low
DMA Acknowledge . This signal is used to notify the request-
ing peripheral that it has been granted a DMA cycle. The
polarity of this signal is programmable. A device reset initial-
izes all dack signals to active low.
Note: N = number of channels
Timing Speci?cations
Figure 3 illustrates the waveform for a write operation into one of the internal registers in the MCDMA core. Clock
edges 1, 2 and 3 indicate the point where the data is written into the registers. Clock edges 2 and 3 indicate a back-
to-back write operation into the same register. The iorin_n signal is held high during the entire write operation.
Figure 3. Processor Write Timing Waveform
1
2
3
Clock
cs_n
iowin_n
ain
dbin
Figure 4 shows the processor read timing waveform. Data is available on the following clock edge after cs_n and
iorin_n are asserted. Clock edges 1, 2, and 3 indicate the edges on which the data is valid.
14
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