pc87317vul National Semiconductor Corporation, pc87317vul Datasheet - Page 245

• Manufacturer Part Number: pc87317vul
• Description: Pc87317vul/pc97317vul Superi/o Plug And Play Compatible With Acpi Compliant Controller/extender
• Manufacturer: National Semiconductor Corporation

14.3.3 Microprocessor Interface Timing
X1
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
RC
WC
t
AR
AW
DH
DS
HZ
PS
RA
RCU
RD
RDH
RI
RVD
WA
WCU
WI
WO
WR
WRR
MFM Data Rate
Symbol
1. Not tested. Guaranteed by design.
500 Kbps
300 Kbps
250 Kbps
1 Mbps
Valid Address to Read Active
Valid Address to Write Active
Data Hold
Data Setup
Read to Floating Data Bus
Port Setup
Address Hold from Inactive Read
Read Cycle Update
Read Strobe Width
Read Data Hold
Read Strobe to Clear FDC IRQ
Active Read to Valid Data
Address Hold from Inactive Write
Write Cycle Update
Write Strobe to Clear FDC IRQ
Write Data to Port Update
Write Strobe Width
Read Cycle = t
Write Cycle = t
RD low after WR high
t
TABLE 14-44. Microprocessor Interface Timing
CH
TABLE 14-43. Nominal t
Parameter
1000
2000
3333
4000
t
AW
AR
FIGURE 14-2. Clock Timing
DRP
+ t
+ t
Device Specifications
1
1
RD
WR
1
+ t
+ t
t
CL
RCU
1
WC
245
3 x t
3 x t
5 x t
6 x t
1
1
t
ICP
ICP
CP
CP
CP
CP
, t
DRP
Min
123
123
18
18
18
13
10
45
60
10
45
60
80
0
0
0
Values
Value
125
125
208
250
Max
25
55
55
55
60
t
CP
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
nsec
Unit
nsec
nsec
nsec
nsec
Unit
www.national.com