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參數(shù)資料
| 型號(hào)： | NSBMC290VF |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Burst Mode Memory Controller |
| 中文描述： | 突發(fā)模式內(nèi)存控制器 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 318K |
| 代理商： | NSBMC290VF |
CPU INTERFACE
The NSBMC290 interface to the Am29000 has been de-
signed for direct interconnect. Normally it is not necessary
to place other logic devices between the processor,
NSBMC290, and memory with the exception of Instruction/
Data bus buffers. The introduction of intermediate buffers
can result in skews or delays that will require that the sys-
tem clock frequency be derated for operation under worst
case conditions.
SIMPLE ACCESS SEQUENCE
The NSBMC290 can return data to the processor in only 4
clocks or 5 clocks for a simple access depending on the
mode chosen (Configuration Bit 17). If multiple access
cycles are requested back to back, then the BMC will pause
for a minimum of 2 clocks between RAS cycles to insure
that the RAS precharge time is met resulting in 5 clocks or 6
clocks between successive simple cycles (depending on
Configuration bit 17).
All access modes begin their cycle in the same fashion as a
simple access. A simple access can become either a pipe-
lined or burst access if the appropriate inputs are driven.
Figure 3 shows the timing relationship between the system
clock, processor control signals and NSBMC290 outputs.
All NSBMC290 outputs are derived synchronously with the
exception of t
ARA7
(processor address to memory address
delay). The shaded section in Figure 3 represents the extra
cycle inserted when the configuration register is initialized
with bit 17 cleared.
TL/V/11803–6
2
DBTX, DBTXa, DBTXb, DBCE, DBCEa, DBCEb, IBTX, IBTXa, IBTXb
FIGURE 3. Simple Access Sequence
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NSBMC290VF-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DRAM Controller |
| NSBMC290VF-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DRAM Controller |
| NSBMC290VF-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DRAM Controller |
| NSBMC290VF-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DRAM Controller |
| NSBMC292 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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