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D765 Datasheet(PDF) 6 Page - NEC

Part # D765
Description  Single/Double Density Floppy-Disk Controller
PDF  17 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

D765 Datasheet(HTML) 6 Page - NEC

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uPD765AIuPD7656
AC Characteristics
= -10 to
=
V
Parameter
Symbol
Min Typ
Max Unit Conditions
Clock period
120
125
500
CLK
240
250
ns
CLK
Parameter
Symbol
Min Typ
Max
Conditions
WCLK cycle time
16
MFM = 0
8
MFM = 1
Clock active
(high, low)
40
WCLK active time
250
350
ns Note 4
CLK
WCLK
0
ns
delay
only
Clock rise
time
20
Clock fall
20
ns
WCLK. RDATA and
20
ns
WINDOW
time
WCLK,
and
20
ns
WINDOW fall time
time
--
DACK
0
setup time to RO
--
CS, DACK
0
ns
hold time from
Preshift
time
from WCLK
WCLK
delav
20
ns
20
100
ns
width
Data access
from
200
140
= 100
20
100
ns
DB to float delay
10
85
ns
time from
--
CS. OACK
AW
0
setup time to WR I
RDATA
time
40
ns
Window cycle time
2
MFM=O
OACK
0
hold time
ns
1
Window hold time
15
n s
from RDATA
width
200
ns
Data setup time to
100
ns
Window setup time
to RDATA
15
n s
setup time
12
CLK
to SEEK
Notes 4, 5
SEEK setup time
7
to DIR
Data hold time from
0
ns
time from
ns Non-DMA
+
mode
+ 135
Direction setup time
to step
hold time
from step t
5.0
INT delay time from
+ 135
cycle time
13
ns (Note 4)
DACK
140
ns
delav
DRQ
DACK
200
n s
delay
ns (Note 4)
DACK width
AA
ns
+ 15
Step active time
6
7
8
Notes 4.5
(high)
Step cycle time
33 Note 2Note 2
Fault reset
8.0
10
time (high)
Write data width
hold time
15
CLK
after seek
Notes 3.4.
5
SEEK hold time
30
CLK
from DIR
Notes 4, 5
DIR hold time
24
after step
Index pulse
4
TC width
Reset width
DRQ
INT
1
14
60
7
7
response time
INT
DACK
ineffective
only
1



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