參數(shù)資料
型號: CD1284
廠商: Intel Corp.
英文描述: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述: 符合IEEE 1284兼容并行接口控制器兩個高速異步串行端口
文件頁數(shù): 162/176頁
文件大?。?/td> 2255K
代理商: CD1284
CD1284
IEEE 1284-Compatible Parallel Interface Controller
162
Datasheet
Figure 25. Asynchronous DMA Read Cycle Timing
Figure 26. Asynchronous DMA Read Cycle Timing (Two Back-to-Back DMA Reads)
DB[15:0]
DMAACK*
CLK
a
b
c
).
3. Figure 25 is still valid, however, Figure 26 illustrates more robust timing.
t
20
t
19
c
MAY CHANGE
VALID
t
23
DMAREQ*
t
24
NOTES:
1. The DMA handshake operates in asynchronous mode only if the AsyncDMA bit is set in PACR.
2. If DMAACK* is released after point
a,
but before point
b
(two rising CLK edges after the falling edge of DMAACK*),
DMAACK*), DB[15:0] is released at t
following the rising edge of CLK. If DMAACK* is held past this edge, it controls the release of
controls the release of DB[15:0]; the data bus remains active until DMAACK* becomes inactive (point
c
).
DB[15:0]
DMAACK*
CLK
NOTE:
The falling edge of DMAACK* is synchronized internally with the rising edge of the clock when asynchronous
timing is selected by PACR[1]. The data valid time can vary by as much as one full CLK cycle depending on when
DMAACK* falling edge occurs in relation to the CLK rising edge. The minimum DMAACK* active time must be met
to ensure that the data has become valid before the rising edge of DMAACK*. The DMAACK* can be extended to
any length, which extends the data valid hold time accordingly. If t
is not met and DMAACK* is deasserted in less
than t
25
(MIN), then the data bus tristates t
27
after the third rising clock edge following the assertion of DMAACK*.
t
27
t
29
VALID
DMAREQ*
SEE NOTE
SEE NOTE
t
28
t
25
VALID
t
26
DMAACK* SYNCHRONIZED
HERE
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