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參數(shù)資料
| 型號： | UPD765B |
| 廠商： | NEC Corp. |
| 英文描述： | Single/Double Density Floppy-Disk Controller |
| 中文描述： | 單/雙密度軟盤控制器 |
| 文件頁數(shù)： | 6/17頁 |
| 文件大?。?/td> | 344K |
| 代理商： | UPD765B |
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
delay
WCLK
0
n s
only
Clock rise
time
20
Clock fall
time-
20
ns
WCLK. RDATA and
WINDOW
20
ns
time
WCLK,
WINDOW fall time
and
20
ns
-
DACK
0
setu-
CS, DACK
hold time from
-
0
n s
Preshift
fromWCLK
time
WCLK
delav
20
ns
20
100
ns
width
Data access
from
200
140
= 100
20
100
ns
DB to float delay
tim-
CS. OACK
setup time to WR I
10
85
ns
-
A W
0
RDATA
time
40
n s
Window cycle time
2
MF M=O
OACK
0
hold time
ns
1
Window hold time
fromRDATA
15
n s
width
200
n s
Data setup time to
100
ns
Window setup time
to RDATA
15
n s
setup time
to SEEK
12
CLK
Notes 4, 5
SEEK setup time
to DIR
7
Data hold time from
0
ns
time from
ns Non-DMA
mode
+ 135
+
Direction setup time
to step
hold time
fromstep t
5.0
INT delay time from
+ 135
cycle time
13
ns (Note 4)
DACK
delav
140
ns
DRQ
delay
DACK
200
n s
ns (Note 4)
DACK width
AA
n s
+ 15
Step active time
(high)
Step cycle time
6
7
8
Notes 4.5
33 Note 2Note 2
Fault reset
time (high)
8.0
10
Write data width
hold time
15
CLK
after seek
Notes 3.4.
5
SEEK hold time
fromDIR
30
CLK
Notes 4, 5
DIR hold time
after step
Index pulse
24
4
TC width
Reset width
DRQ
response time
INT
1
14
60
7
7
INT
ineffective
DACK
only
1
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