Cirrus Logic CS8900A - Manual (Page 128)

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
- - 8 ns
TXD Pair Return to ≤ 50 mV after Last Positive Transition t
TTX2
- - 4.5 µs
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
tTTX3
t
TTX2
Figure 56. 10BASE-T Transmit