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| 型号： | DMA-MC-XP-N2 |
| 厂商： | Lattice Semiconductor Corporation |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | IP CORE MCDMA CTLR XPGA ISPXPGA |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | DMAMCXPN2 |
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Lattice Semiconductor
Multi-Channel DMA Controller User’s Guide
? Demand Transfer Mode: In demand transfer mode, the device is programmed to continue making transfers until
a Terminal Count or external eopin_n is encountered or until dreq goes inactive. Thus, transfers continue until
the I/O device has exhausted its data capacity. After the I/O device has had a chance to catch up, the DMA ser-
vice is reestablished by dreq .
Parameter Descriptions
Table 3 lists the parameters used to con?gure the MCDMA core. The values of these parameters must be set prior
to functional veri?cation. The parameters in parenthesis can be con?gured using the IPexpress? software tool,
included with the ispLEVER ? design tools.
Table 3. MCDMA Parameters
Parameter
DMA Mode (MODE_8237)
Number of Channel
(NUM_CHANNELS)
Data Width
(DATA_BUS_WIDTH)
Address Width
(ADDR_BUS_WIDTH)
Word Count Width
(WORD_COUNT_WIDTH)
Internal Address Width
(AIN_BUS_WIDTH)
Description
De?nes the DMA mode. If it is TRUE, the DMA will be in
8237 mode, otherwise it will be in non-8237 mode.
Sets the number of channels. In 8237 mode it is ?xed to 4
channels. In non 8237 it can be set for 1 to 16 channels
Sets the size of data buses and the temporary register.
Sets the size of DMA output address. In the 8237 mode, it
sets the size of the current and base address register. In the
non-8237 mode, it sets the size of the source address regis-
ter
Sets the size of the Word Count Register.
Value is set automatically based in the number of channels
parameter (NUM_CHANNELS or N).
Supported Values
TRUE/FALSE
4 (8237)
1-16 (non 8237)
8 (8237)
8/16/32/64 (non 8237)
16 (8237)
16/24/32 (non 8237)
16 (8237)
8/16/24/32 (non 8237)
4 (8237)
3 when N = 1 (non 8237)
4 when N = 2 (non 8237)
5 when 3 ≤ N ≤ 4 (non 8237)
6 when 5 ≤ N ≤ 8 (non 8237)
7 when 9 ≤ N ≤ 16 (non 8237)
12
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