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PC8477B датащи(PDF) 43 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали PC8477B
подробное описание детали  Advanced Floppy Disk Controller
PDF  54 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC8477B датащи(HTML) 43 Page - National Semiconductor (TI)

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60 Device Description (Continued)
625 DMA Timing
Symbol
Parameter
Min
Max
Units
tQP
DRQ Period (Except Non-Burst DMA) (Note 8)
8 x tDRP
m
s
tQQ
DRQ Inactive Non-Burst Pulse Width
300
400
ns
tKQ
DACK Active Edge to DRQ Inactive
65
ns
tRQ
RD WR Active Edge to DRQ Inactive (Note 7)
65
ns
tQR
DRQ to RD WR Active
15
ns
tTT
TC Active Pulse Width
50
ns
tTQ
TC Active Edge to DRQ Inactive (Note 9)
75
ns
tKK
DACK Active Pulse Width
65
ns
tKI
DACK Inactive Pulse Width
25
ns
tKR
DACK Setup to RD WR Active
5
ns
tRK
DACK Hold from RD WR Inactive
0
ns
tQW
DRQ to End of RD WR (Note 8)
(8 x tDRP
m
s
(DRQ Service Time)
b
16xtICP)
tQT
DRQ to TC Active (Note 8)
(8 x tDRP
m
s
(DRQ Service Time)
b
16xtICP)
Note 7
The active edge of RD or WR is recognized only when DACK is active
Note 8
Values shown are with the FIFO disabled or with FIFO enabled and THRESH e 0 For nonzero values of THRESH add (THRESHx8xtDRP) to the values
shown
Note 9
During normal DMA operation TC should occur when DACK is active during the last byte of the last sector transferred
TLF11332 – 19
FIGURE 6-4 DMA Timing
43



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