Instruction Manual

128 DS271F5
CS8900A
Crystal LAN™ Ethernet Controller
CIRRUS LOGIC PRODUCT DATASHEET
SWITCHING CHARACTERISTICS (Continued)
Parameter Symbol Min Typ Max Unit
16-Bit Memory Write
Address, SBHE
, CHIPSEL valid to MEMCS16 low t
MEMW1
- - 30 ns
Address, SBHE
, CHIPSEL valid to MEMW low t
MEMW2
20 - - ns
MEMW
pulse width t
MEMW3
110 - - ns
MEMW
low to SD valid t
MEMW4
- - 40 ns
SD hold after MEMW
high t
MEMW5
0--ns
Address hold after MEMW
inactive t
MEMW6
0--ns
MEMW
inactive to active t
MEMW7
35 - - ns
10BASE-T Transmit
TXD Pair Jitter into 100 Ω Load t
TTX1
--8ns
TXD Pair Return to ≤ 50 mV after Last Positive Transition t
TTX2
--4.5µs
TXD Pair Positive Hold Time at End of Packet t
TTX3
250 - - ns
SA [19:0],
SBHE,
CHIPSEL
Valid Address
MEMCS16
IN
DIRECTION:
IN or OUT of chip
MEMW
SD [15:0] Valid Data In
OUT
IN
IN
t
MEMW3
t
MEMW4
t
MEMW5
t
MEMW6
t
MEMW7
t
MEMW2
t
MEMW1
Figure 55. 16-Bit Memory Write
TXD±
t
TTX1
t
TTX3
t
TTX2
Figure 56. 10BASE-T Transmit