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
Pin No(s).
Symbol
Type
Name & Functions
XpressFlow Bus Interface
185,184,183,182,180,
179,177,176,175,174,
172,171,169,168,167,
P_D[31:0]
TTL I/O-TS Management Bus – Data Bit [31:0]
(5VT)
166,164,163,160,159,
157,156,154,153,151,
150,149,148,146,145,
143,142
211,210,208,207,205,
204,203,202,201,199,
198
P_A[11:1]
TTL Input
(5VT)
Management Bus – Address Bit [11:1]
196
P_ADS#
P_RWC
P_RDY#
P_BS16#
P_CS#
TTL Input
(5VT)
Management Bus – Address Strobe
191
183
184
185
189
TTL Input
(5VT)
Management Bus – Read/Write Control
CMOS Out- Management Bus – Data Ready
OD
CMOS Out- Management Bus – 16 bit Data Bus
OD
TTL Input
(5VT)
Management Bus – Chip Select
P_RSTIN#
TTL In-ST
(5VT)
System RESET Input
190
192
187
P_RSTOUT
P_INT
CMOS Output CPU RESET Output
CMOS Output Management Bus – Interrupt Request
P_CLK
TTL Input
(5VT)
CPU Clock
Control Buffer Memory Interface
60,59,58,57,56,54,53,51, L_D[31:0]
50,49,48,47,46,45,43,42,
40,39,38,37,36,34,33,30,
TTL I/O-TS Local Memory Bus – Data Bit [31:0]
CMOS Output Local Memory Bus – Address Bit [17:2]
29,27,26,25,24,23,22,21,
8,6,5,3,2,1,256,255,254, L_A[18:2]
253,251,250,248,247,
246,245,244
9
L_A[19] /
L_OE[3]#
CMOS Output Local Memory Bus – Address Bit [19:18]
or Memory Read Chip Select [3]
63, 11, 19
242, 62, 10, 18
12,13,14,15
16
L_OE[2:0]#
CMOS Output Local Memory Bus- Read Chip Select
[2:0]
L_WE[3:0]#, CMOS Output Local Memory Bus – Write Chip Select
[3:0]
L_BWE[3:0]# CMOS Output Local Memory Bus – Byte Write Enable
[3:0]
L_ADSC#
CMOS Output Local Memory Bus – Controller Address
Status
66
L_CLK
CMOS Output Local Memory Bus – Synchronous Clock
© 1998 Vertex Networks, Inc.
5
Rev. 4.5 – February
1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
