CS8900A
Crystal LAN™ ISA Ethernet Controller
SWITCHING CHARACTERISTICS (Continued)
Parameter
16-Bit Memory Read, IOCHRDY Not Used
SA [19:0], SBHE, CHIPSEL, active to MEMCS16 low
Address, SBHE, CHIPSEL active to MEMR active
MEMR low to SD valid
Symbol
Min
Typ
Max
Unit
tMEMR1
tMEMR2
tMEMR3
tMEMR4
tMEMR5
tMEMR6
-
10
-
-
-
30
ns
ns
ns
ns
ns
ns
-
-
135
Address, SBHE, CHIPSEL hold after MEMR inactive
MEMR inactive to SD 3-state
0
-
-
-
-
-
30
-
MEMR inactive to active
35
16-Bit Memory Read, With IOCHRDY
MEMR low to IOCHRDY inactive
tMEMR7
tMEMR8
tMEMR9
-
125
-
35
-
-
175
0
ns
ns
ns
IOCHRDY low pulse width
IOCHRDY active to SD valid
-
DIRECTION:
IN or OUT of chip
SA [19:0],
Valid Address
IN
SBHE,
CHIPSEL
t
MEMR1
t
MEMR4
MEMCS16
MEMR
OUT
t
t
MEMR6
MEMR2
IN
t
t
MEMR3
MEMR5
OUT
SD [15:0]
Valid Data
16-Bit Memory Read, IOCHRDY not used
DIRECTION:
IN or OUT of chip
SA [19:0],
SBHE,
Valid Address
IN
CHIPSEL
MEMCS16
MEMR
OUT
IN
t
MEMR7
IOCHRDY
OUT
OUT
t
MEMR8
SD [15:0]
Valid Data
t
MEMR9
16-Bit Memory Read, with IOCHRDY
CIRRUS LOGIC PRODUCT DATA SHEET
114
DS271PP3
CIRRUS [ CIRRUS LOGIC ]
