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PC87311AVF 数据表(PDF) 70 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 PC87311AVF
功能描述  PC87311A/PC87312 (SuperI/OTM II/III) Floppy Disk Controller with Dual UARTs, Parallel Port, and IDE Interface
PDF  78 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

PC87311AVF 数据表(HTML) 70 Page - National Semiconductor (TI)

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90 Device Description (Continued)
928 DMA Timing
Symbol
Parameter
Min
Max
Units
tKI
DACK Inactive Pulse Width
25
ns
tKK
DACK Active Pulse Width
65
ns
tKQ
DACK Active Edge to DRQ Inactive
65
ns
tQK
DRQ to DACK Active Edge
10
ns
tQP
DRQ Period (except Non-Burst DMA)
8 c tDRP
m
s
tQQ
DRQ Inactive Non-Burst Pulse Width
300
400
ns
tQR
DRQ to RD WR Active
15
ns
tQW
DRQ to End of RD WR (Note 2)
(8 c tDRP b 16 c tICP)
m
s
(DRQ Service Time)
tQT
DRQ to TC Active (Note 2)
(8 c tDRP b 16 c tICP)
m
s
(DRQ Service Time)
tRQ
RD WR Active Edge to DRQ Inactive (Note 1)
65
ns
tTQ
TC Active Edge to DRQ Inactive
75
ns
tTT
TC Active Pulse Width
50
ns
Note 1
The active edge of RD or WR is recognized only when DACK is active
Note 2
Values shown are with the FIFO disabled or with FIFO enabled and THRESH e 0 For non-zero values of THRESH add (THRESH c 8 c tDRP)tothe
values shown
TLF11362 – 26
FIGURE 9-8 DMA Timing
70



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