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): 168/176頁
文件大小: 2255K
代理商: CD1284
CD1284
IEEE 1284-Compatible Parallel Interface Controller
168
Datasheet
Figure 32. Synchronous DMA Write Cycle Timing
(Two Back-to-Back 3-Cycle DMA Writes)
Figure 33. Synchronous DMA Read Cycle Timing
(Two Back-to-Back 3-Cycle DMA Reads)
DB[15:0]
DMAACK*
CLK
NOTE:
The data is sampled on the second rising edge of CLK following the assertion of DMAACK*, as long as
setup time (t
) is met. If DMAACK* is held active for more than 2.5 CLK cycles, then the next DMA
cycle is simply delayed; the data is still sampled on the second rising CLK edge following the assertion
of DMAACK*.
t
16
VALID
DMAREQ*
t
18
VALID
C
C1
C2
C3
C1
C2
C3
C
DATA SAMPLED
HERE
t
15
t
25
t
17
t
22
t
22
t
17
DATA SAMPLED
HERE
SEE NOTE
SEE NOTE
DB[15:0]
DMAACK*
CLK
NOTE:
The data is driven (t
) after the first falling edge of CLK following the assertion of DMAACK*, as long as setup
time (t
) is met. If DMAACK* is held active for more than 2.5 CLK cycles after C1 falling edge, then the next DMA
cycle is simply delayed, but the data is still driven (t
24
) after the first falling CLK edge following the next assertion
of DMAACK*.
VALID
DMAREQ*
t
18
VALID
C
C1
C2
C3
C1
C2
C3
C
t
15
SEE NOTE
SEE NOTE
t
25
t
18
t
24
t
16
t
23
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