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PC87303 Datasheet(PDF) 106 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87303
Description  PC87303VUL SuperI/OTM Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, IEEE 1284 Parallel Port, and IDE Inter
PDF  114 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87303 Datasheet(HTML) 106 Page - National Semiconductor (TI)

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100 Electrical Characteristics (Continued)
10282 ECP
Symbol
Parameter
Min
Max
Units
tKIP
PDACK Inactive Pulse Width
25
ns
tKKP
PDACK Active Pulse Width
65
ns
tKQP
PDACK Active Edge to PDRQ Inactive (Notes 2 3)
65 a (6x32xtCP)ns
tQKP
PDRQ to PDACK Active Edge
10
ns
tQPP
PDRQ Period
330
m
s
tQQP
PDRQ Inactive Non-Burst Pulse Width
300
400
ns
tQRP
PDRQ to RD WR Active
15
ns
tRQP
RD or WR Active Edge to PDRQ Inactive (Note 1)
65
ns
tTQP
TC Active Edge to PDRQ Inactive
75
ns
tTT
TC Active Pulse Width
50
ns
Note 1
The active edge of RD or WR and TC is recognized only when PDACK is active
Note 2
One DMA transaction takes six clock cycles
Note 3
tCP is defined in Section 1022 Clock Timing
TLC12074 – 69
FIGURE 10-12b ECP DMA Timing
106



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