W90210F Winbond Electronics Corp America, W90210F Datasheet - Page 31

• Manufacturer Part Number: W90210F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

each channel.
channel.
for a channel is cleared when a channel is active, the DMA will be suspended after pending requests for the
channel are serviced. The DMA operation will resume normally when the bit is reset.
0
DMA Channel Mode Register (MODE0=20c, MODE1=21c)
1 2 3 4 5
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The
The
The
The
Wait State Number
channel terminal count flags
DMA channel enable bits
Recovery State Number
6
7
Figure 8.6 Programming DMA controller MODE register
8
specifies the number of wait state needed for the particular DMA channel.
9
MODE
10
enable or suspend a DMA operation after a channel is set up. If a enable bit
specifies the number of wait state needed for the recovery of the DMA
11
indicate that a DMA operation has stopped.
31
DMA Channel Enable Bit
Terminal Indicator
0: Polling
1: Interrupt
DMA is used by Parallel Port (ECP)
15
Terminal Count Flag
16
Transfer Start (only for memory-to-memory)
: The MODE register specifies the operation mode of
Transfer Type: Block (0) or Demand(1)
DMA I/O Type
00: 8-bit
01: 16-bit
10: 32-bit
11: reserved
DMA Transfer Type
00: memory to memory
01: memory to I/O
10: I/O to memory
11: reserved
20
Recovery State
Number
Wait State
W90210F
Version 1.4, 10/8/97