Instruction Manual

DS271F5 115
CS8900A
Crystal LAN™ Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
SWITCHING CHARACTERISTICS (Continued)
Parameter Symbol Min Typ Max Unit
16-Bit Memory Read, IOCHRDY Not Used
SA [19:0], SBHE
, CHIPSEL, active to MEMCS16 low t
MEMR1
- - 30 ns
Address, SBHE
, CHIPSEL active to MEMR active t
MEMR2
10 - - ns
MEMR
low to SD valid t
MEMR3
--135ns
Address, SBHE
, CHIPSEL hold after MEMR inactive t
MEMR4
0--ns
MEMR
inactive to SD 3-state t
MEMR5
-30-ns
MEMR
inactive to active t
MEMR6
35 - - ns
16-Bit Memory Read, With IOCHRDY
MEMR
low to IOCHRDY inactive t
MEMR7
-35-ns
IOCHRDY low pulse width t
MEMR8
125 - 175 ns
IOCHRDY active to SD valid t
MEMR9
--0ns
SA [19:0],
SBHE,
CHIPSEL
Valid Address
MEMCS16
IN
DIRECTION:
IN or OUT of chip
MEMR
SD [15:0] Valid Data
OUT
IN
OUT
t
MEMR1
t
MEMR2
t
MEMR3
t
MEMR4
t
MEMR5
t
MEMR6
Figure 36. 16-Bit Memory Read, IOCHRDY not used
SA [19:0],
SBHE,
CHIPSEL
Valid Address
MEMCS16
IN
DIRECTION:
IN or OUT of chip
MEMR
SD [15:0] Valid Data
OUT
IN
OUT
IOCHRDY OUT
t
MEMR7
t
MEMR8
t
MEMR9
Figure 37. 16-Bit Memory Read, with IOCHRDY