STP2001QFP Sun Microelectronics, STP2001QFP Datasheet - Page 11

• Manufacturer Part Number: STP2001QFP
• Description: Integrated SBus Interface Slave I/O Controller
• Manufacturer: Sun Microelectronics

STP2001.frm Page 11 Monday, August 25, 1997 2:46 PM
AC Characteristics: Floppy Controller Timing
July 1997
1. The NCR82077 core uses a digital data separator to read the data off of the disk. Any variation from the nominal input clock frequencies
2. NOTE 4: Internal clock period is a function of the selected data rate.
3. FPY_STEP Rate time is selected by a SPECIFY command. Failure to issue a specify command before issuing a Recalibrate or Seek
4. FPY_RDDATA data rate is determined by the floppy tape drive or tape drive. The values are:
5. FPY_WRDATA pulse width is based on the selected data rate. The values are 2 x t
Signal #
will shift the capture range of the cell.
command or implied seek will cause unpredictable results.
• 1 Mbs – 1.0 s minimum
• 500 Kbs – 2.0 s minimum
• 300 Kbs – 3.3 s minimum
• 250 Kbs – 4.0 s minimum
• 1 Mbs - 2 x 62.5 = 125 ns
• 500 Kbs - 2 x 125 = 250 ns
• 300 Kbs - 2 x 208 = 416 ns
• 250 Kbs - 2 x 250 = 500 ns
21
22
23
24
25
26
27
28
29
30
31
32
33
Data Rate
500 Kbs
300 Kbs
250 Kbs
1 Mbs
FPY_CLK32 clock period
FPY_CLK24 clock high time
FPY_CLK24 clock low time
FPY_CLK24 clock period
Internal clock period (t
FPY_DIR change to FPY_STEP setup time
FPY_STEP pulse width
FPY_STEP rate
FPY_INDEX pulse width
FPY_RDDATA pulse width
FPY_RDDATA data rate
FPY_WRGATE to FPY_WRDATA setup
time
FPY_WRDATA pulse width
Frequency
4.8 MHz
16 MHz
8 MHz
4 MHz
Parameter
[3]
CI
)
[4]
[2]
[1]
[1]
[5]
Period
62.5 ns
125 ns
208 ns
250 ns
Integrated SBus Interface Slave I/O Controller
Conditions
CI
:
250 K
31.3
16.7
16.7
41.7
62.5
Min
250
125
1.0
50
7
1
4
Slave I/O
Max
31.3
41.7
250
1 M
500
25
25
15
–
8
–
–
–
STP2001QFP
Units
bit/s
ms
ns
ns
ns
ns
ns
t
ns
ns
ns
CI
s
s
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