P
R
E
L
I
M
I
N
A
R
Y
I
N
F
O
R
M
A
T
I
O
N
XpressFlow-2020 Series –
Ethernet Switch Chipset
SC220
XpressFlow Engine
2.3.4 Intel 386 Processor Interface
P_CLK
PH2 (internal)
PH2
P_ADS#
P_A[11:1]
P_CS#
P_W/R#
P_RDY#
P_D[15:0] (in)
P_D15:0] (out)
Typical 386 CPU I/O Access Operations
P_CLK
PH2 (internal)
P_RSTIN#
PH2
PH1
PH2
PH2 or PH1
P_RSTOUT#
Internal PH2 Clock Synchronization
Note: See Intel 386 Processor Data Book for more details
© 1998 Vertex Networks, Inc.
1999
17
Rev. 4.5 – February