Cirrus Logic CS8900A - Manual (Page 126)

126 DS271F5
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
- - 135 ns
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
- - 0 ns
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 51. 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 52. 16-Bit Memory Read, with IOCHRDY