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
1. PIN ASSIGNMENT
1.1 Logic Symbol
SC220
T_MODE
C_D[15:0]
Test Pin
L_D[31:0]
L_A[18:2]
4
C_CE#
C_WE#
C_CM#
C_EC#
C_MF#
C_FF#
L_BWE[3:0]#
4
L_WE[3:0]#
4
L_OE[3:0]#
L_ADSC#
L_CLK
P_D[31:0]
P_A[11:1]
S_D[31:0]
S_MSGEN#
S_EOF#
S_IRDY
S_TABT#
S_OVLD#
P_CS#
P_ADS#
P_RWC
P_RDY#
P_BS16#
P_INT
S_HPREQ#
8
S_REQ[8:1]#
S_GNT[8:1]#
P_RSTIN#
P_RSTOUT
P_CLK
8
S_CLK
Note:
The SC220 is pin compatible to the SC201 with only one exception:
The RSTOUT pin of SC201 is defined as a synchronous RESET output pin which follows the RSTIN input and re-synchronous with
P_CLK for meeting the 80386 timing requirement.
The RSTOUT pin for SC220 has a totally different function. It is no longer related with the RSTIN input. The RSTOUT is a watch-
dog output from SC220 to keep track of the active state of the host processor. Host processor needs to access the Keep
Alive register periodically to prevent the setting of the RSTOUT output. The RSTOUT output can be use as Reset input to
the host processor.
© 1998 Vertex Networks, Inc.
3
Rev. 4.5 – February
1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
