Instruction Manual

114 DS271F5
CS8900A
Crystal LAN™ Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
7.4 SWITCHING CHARACTERISTICS (T
A
= 25 °C; V
DD
= 5.0 V or VDD = 3.3V)
Parameter Symbol Min Typ Max Unit
16-Bit I/O Read, IOCHRDY Not Used
Address, AEN, SBHE
active to IOCS16 low t
IOR1
- - 35 ns
Address, AEN, SBHE
active to IOR active t
IOR2
10 - - ns
IOR
low to SD valid t
IOR3
--135ns
Address, AEN, SBHE
hold after IOR inactive t
IOR4
0--ns
IOR
inactive to active t
IOR5
35 - - ns
IOR
inactive to SD 3-state t
IOR6
-30-ns
16-Bit I/O Read, With IOCHRDY
IOR
active to IORCHRDY inactive t
IOR7
-30-ns
IOCHRDY low pulse width t
IOR8
125 - 175 ns
IOCHRDY active to SD valid t
IOR9
--0ns
SA [15:0],
AEN, SBHE
Valid Address
IOCS16
IN
DIRECTION:
IN or OUT of chip
IOR
SD [15:0] Valid Data
OUT
IN
OUT
t
IOR1
t
IOR2
t
IOR3
t
IOR4
t
IOR5
t
IOR6
Figure 34. 16-Bit I/O Read, IOCHRDY not used
SA [15:0],
AEN, SBHE
Valid Address
IOCS16
IN
DIRECTION:
IN or OUT of chip
IOR
SD [15:0] Valid Data
OUT
IN
OUT
IOCHRDY OUT
t
IOR7
t
IOR8
t
IOR9
Figure 35. 16-Bit I/O Read, with IOCHRDY