Tnetx4090 thunderswitch ii, Switch – Texas Instruments THUNDERSWITCH II TNETX4090 User Manual
Page 68
TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
68
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
RDRAM interface
RDRAM (see Figure 24)
NO.
MIN
MAX
UNIT
1
tc(DX_CLK)
Cycle time DTX_CLK, DRX_CLK
3.33
3.33
ns
2, 3
tw(DX_CLK)
Pulse duration, DTX_CLK, DRX_CLK low or high
45%
55%
tc(DX_CLK)
4, 5
tw(TICK)
Pulse duration, tick time
0.5
0.5
tcycle
6, 8
tsu(DBUS_DATA) Setup time, DBUS_DATA before tick
0.35
ns
7, 9
th(DBUS_DATA)
Hold time, DBUS_DATA after tick
0.35
ns
10, 11
td(DBUS_OUT)
Delay time, DBUS_DATA, DBUS_CTRL, DBUS_EN from tick
0.635
1.438
tc(DX_CLK)
tcycle†
Cycle time, internal clock
4
tc(DX_CLK)
† Not shown in Figure 24 due to scale
ОО
ОО
ОООО
ОООО
ООООООО
ООООООО
ООООООО
ООООООО
DBUS_DATA (in)
DTX_CLK
DRX_CLK
DBUS_CTRL
DBUS_EN
DBUS_DATA (out)
6
7
8
9
10
11
4
5
2
3
1
Figure 24. RDRAM