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DP8496 Datasheet(PDF) 79 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8496
Description  SCSI-2 Disk Data Controller
PDF  92 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8496 Datasheet(HTML) 79 Page - National Semiconductor (TI)

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70 AC Specifications (Continued)
717 SCSI ARBITRATION
TLF11212 – 51
ID
Symbol
Parameter
Optimal BCLK
Worst Case
Units
Min
Max
Min
Max
171
bfbl
Bus Free to BSY Out Asserted
12
15
12
22
m
s
172
blsl
BSY Out Asserted to SEL Out Asserted
24
40
24
50
m
s
173
sea
SEL Out Asserted to SCSI Data Change
12
14
12
21
m
s
174
blidv
BSY Out Asserted to Valid SCSI ID
b
30
30
b
30
30
ns
175
bfidi
Bus Free to Valid SCSI ID
12
15
12
22
m
s
Note
BCLK is defined in the Setup 1 register Optimal BCLK is defined as follows
Bclk Freq Code
7
6
Optimal Frequency
0
0
15 MHz
1
0
175 MHz
0
1
20 MHz
1
1
25 MHz
ALL SCSI Signals are active-high on the DP8497
718 SCSI SELECTION AS INITIATOR
(WO Arbitration)
TLF11212 – 52
ID
Symbol
Parameter
Optimal BCLK
Worst Case
Units
Min
Max
Min
Max
181
bsel
BSY In Asserted to SEL Out Deasserted
90
90
ns
182
idsel
Valid SCSI ID Out to SEL Out Asserted
90
230
90
350
ns
183
selid
SEL Out Deasserted to SCSI ID Out Invalid
b
30
30
b
30
30
ns
184
idatn
Valid SCSI ID Out to ATN Out Asserted (if Enabled)
b
30
30
b
30
30
ns
185
bidi
BSY In Asserted to SCSI ID Out Invalid
90
90
ns
Note ALL SCSI Signals are active-high on the DP8497
79



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