參數(shù)資料
型號(hào)： NS32FV100FV
廠商： National Semiconductor Corporation
英文描述： System Controller
中文描述： 系統(tǒng)控制器
文件頁(yè)數(shù)： 32/94頁(yè)
文件大?。?/td> 955K
代理商： NS32FV100FV
2.0 Architecture
(Continued)
(3) The OVR bit in the STAT register is set to ‘‘1’’
and the EOVR bit is ‘‘1’’. In the last case the
CHEN bit is forced to ‘‘0’’ and cannot be set to
‘‘1’’ by software unless the OVR is either
cleared or masked by clearing the EOVR bit in
the STAT register.
VLD
Transfer Parameter Valid. Indicates whether the
transfer parameters for the next block to be trans-
ferred are valid. The VLD bit is ignored in auto-ini-
tialize operation mode and is cleared by hardware
after ADRA and BLTR have been copied to ADCA
and BLTC respectively. VLD is used to distinguish
between single transfer and double-buffer opera-
tion modes.
2.6.6 Usage Recommendations
1. Before activating the DMA, program the appropriate
Ports module registers PBDO, PBMS, PCDO, PCMS and
PCEN to connect the DMA to the NS32FX100 I/O pins.
2. Set the MCFG register to allocate the DMA channels as
either internal or external, as appropriate.
3. The Ports module must be configured to allow the alloca-
tion of the I/O pins to the DMA channels.
2.6.7 DMAC Bus Cycles
TL/EE/11331–20
FIGURE 2-15. DMA Fly-By Read Transaction (DIR
e
0, NFBY
e
0)
The maximum throughput of a DMA channel is 12.5 Mbyte/sec. (Two bytes can be transferred at a rate of four CTTL cycles per
transfer, up to 25 MHz.)
Note 1:
Memory control signals (like CWAIT, select and write enable) are generated according to the specifications of the accessed zone.
Note 2:
A
v
in the figure indicates DMA priority resolving points.
32
相關(guān)PDF資料
PDF描述
NS32FV100-20 System Controller(系統(tǒng)控制器)
NS32FV100-25 System Controller(系統(tǒng)控制器)
NS32FX100-15 System Controller(系統(tǒng)控制器)
NS32FX100-20 System Controller(系統(tǒng)控制器)
NS32FX200-25 System Controller(系統(tǒng)控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NS32FV16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
NS32FV16-20 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Imaging/Communication Signal Processors
NS32FV16-25 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Imaging/Communication Signal Processors
NS32FX100 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
NS32FX100-15 制造商:NSC 制造商全稱:National Semiconductor 功能描述:System Controller
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