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| 型号： | GT- 32090 |
| 厂商： | Galileo Technology Services, LLC |
| 英文描述： | Highly Integrated Single-Chip System Controller(高集成单片系统控制器) |
| 中文描述： | 高度集成的单芯片系统控制器（高集成单片系统控制器） |
| 文件页数： | 18/67页 |
| 文件大小： | 524K |
| 代理商： | GT- 32090 |
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GT-32090 System Controller For i960JX Processors
25
Galileo
Technology, Inc.
Channel 1 Control, Offset: 0x844
Channel 2 Control, Offset: 0x848
Some extra notes on DMA programming follow:
- Non-Chained mode:
In this mode, Source, Destination and Byte Count should be initialized prior to enabling the channel. ChainMod should
be set to ‘1’.
- Chained mode:
All the channel record’s parameters for the current transaction (Source, Byte Count, Destination and Next Record
Pointer) should be initialized in DRAM or Devices. The address of the first record should be initialized by writing it to the
NextRecPtr of the channel. The channel should be enabled via ChanEn=1, the FetNexRec should be set to ‘1’ and the
ChainMod should be set to ‘0’.
- Restarting a disabled channel
In Non-Chained mode, ChanEn should be set to ‘1’.
In Chained mode, the software should find out if the first fetch took place. If it did, only ChanEn should be set to ‘1’. If it
did not, the FetNexRec should also be set to ‘1’.
- Reprogramming an active channel
The channel should first be disabled via ChanEn=0. Then it must be assured that the channel is no longer active (for
example by polling the DMAActSt of the channel). New DMA parameters should be programmed prior to re-enabling
the channel via ChanEn=1.
13
FetNexRec
Fetch Next Record.
0 - Normal state (this bit is never written as ‘0’, this is
the toggle state after fetch is completed).
1 - Forces a fetch of the next record (even if the cur-
rent DMA has not ended). This bit is reset after fetch
is completed (meaningful only in Chained mode).
0x0
14
DMAActSt
DMA Activity Status (read only).
0 - Channel is not active
1 - Channel is active
0x0
Bits
Field Name
Function
Initial Value
14:0
Various
Fields function as in Channel 0 Control
0x0
Bits
Field Name
Function
Initial Value
14:0
Various
Fields function as in Channel 0 Control
0x0
Bits
Field name
Function
Initial Value
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