am79c974 Advanced Micro Devices, am79c974 Datasheet - Page 95

• Manufacturer Part Number: am79c974
• Description: Pcnettm-scsi Combination Ethernet And Scsi Controller For Pci Systems
• Manufacturer: Advanced Micro Devices

AC SWITCHING CHARACTERISTICS over operating range unless otherwise specified
PCI Bus Interface and Board Interface
Note:
Parameter value is given for automatic EEPROM read operation. When EEPROM port (BCR19) is used to access the EEPROM,
software is responsible for meeting EEPROM timing requirements.
Clock Timing
Output and Float Delay Timing
Setup and Hold Timing
tVAL (EESK) EECS Valid Output Delay from EESK
tSU (EEDO) EEDO Setup Time to EESK
tVAL (EEDI)
Parameter
tH (EEDO)
tVAL (REQ)
tSU (GNT)
tH (GNT)
Symbol
fEESK
tHIGH
tLOW
tFALL
tRISE
tCYC
tVAL
tOFF
tON
tSU
tH
Parameter Description
CLK Frequency
CLK Period
CLK High Time
CLK Low Time
CLK Fall Time
CLK Rise Time
AD[31:00], C/BE[3:0], PAR,
FRAME, IRDY, TRDY, STOP,
LOCK, DEVSEL, PERR, SERR
Valid Delay
REQ Valid Delay
EESK Frequency
EEDI Valid Output Delay from EESK
AD[31:00], C/BE[3:0], PAR, FRAME,
IRDY, TRDY, STOP, LOCK, DEVSEL
Active Delay
AD[31:00], C/BE[3:0], PAR, FRAME,
IRDY, TRDY, STOP, LOCK, DEVSEL
Float Delay
AD[31:00], C/BE[3:0], PAR, FRAME,
IRDY, TRDY, STOP, LOCK, DEVSEL,
IDSEL
Setup Time
AD[31:00], C/BE[3:0], PAR, FRAME,
IRDY, TRDY, STOP, LOCK, DEVSEL,
IDSEL
Hold Time
GNT Setup Time
GNT Hold Time
EEDO Hold Time from EESK
P R E L I M I N A R Y
Am79C974
Test Conditions
@ 1.5 V
@ 2.0 V
@ 0.8 V
over 2 V p-p
over 2 V p-p
(See note below)
(See note below)
(See note below)
(See note below)
(See note below)
Min
100
30
12
12
10
50
0
1
1
2
1
0
2
7
0
0
0
Max
650
400
400
33
11
12
11
28
4
4
AMD
MHz
Unit
V/ns
V/ns
KHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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