CS8900A
Crystal LAN™ ISA Ethernet Controller
SWITCHING CHARACTERISTICS (Continued)
Parameter
DMA Read
Symbol
Min
Typ
Max
Unit
DMACKx active to IOR active
AEN active to IOR active
IOR active to Data Valid
tDMAR1
tDMAR2
tDMAR3
tDMAR4
tDMAR5
tDMAR6
60
10
-
-
-
-
-
ns
ns
ns
ns
ns
ns
-
135
-
IOR inactive to SD 3-state
IOR n-1 high to DMARQx inactive
DMACKx, AEN hold after IOR high
16-Bit I/O Write
-
30
-
-
20
20
Address, AEN, SBHE valid to IOCS16 low
Address, AEN, SBHE valid to IOW low
IOW pulse width
tIOW1
tIOW2
tIOW3
tIOW4
tIOW5
tIOW6
tIOW7
-
20
110
0
-
-
-
-
-
-
-
35
-
ns
ns
ns
ns
ns
ns
ns
-
SD hold after IOW high
-
IOW low to SD valid
-
10
-
IOW inactive to active
35
0
Address hold after IOW high
-
DIRECTION:
IN or OUT of chip
tDMA5
OUT
DMARQx
tDMA6
tDMA1
DMACKx
IN
IN
AEN
tDMA2
IORn-1
IORn
IOR
IN
tDMA3
tDMA4
Valid
Data
Valid
Data
Valid
Data
SD[15:0]
OUT
16-Bit DMA Read
DIRECTION:
IN or OUT of chip
SA [15:0],
AEN, SBHE
Valid Address
IN
t
IOW1
t
IOW7
t
IOCS16
OUT
t
t
IOW3
IOW6
t
IOW2
IOW
IN
IN
IOW4
t
IOW5
SD [15:0]
Valid Data In
16-Bit I/O Write
CIRRUS LOGIC PRODUCT DATA SHEET
DS271PP3
115
CIRRUS [ CIRRUS LOGIC ]
