SC220 ZARLINK [Zarlink Semiconductor Inc], SC220 Datasheet - Page 15

• Manufacturer Part Number: SC220
• Description: XpressFlow 2020 Ethernet Routing Switch Chipset
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

XpressFlow-2020 Series –
Ethernet Switch Chipset
Supported Memory Configurations
2.2.2
© 1998 Vertex Networks, Inc.
1999
L_D[31:0] (Wr)
L_D[31:0] (Rd)
L_BWE[3:0]#
L_WE[3:0]#
L_OE[3:0]#
128k x 32
Chip Size
256k x32
64k x 32
L_ADSC#
L_A[19:2]
RAM
L_CLK
L_CS#
Bus Cycle Waveforms
Note: Refer to manufacturer’s data sheet for detailed timing parameters.
P
Chips
RAM
# of
1
2
4
1
2
4
1
2
R
A1
E
D1
Total Buffer
256k bytes
512k bytes
256k bytes
1M bytes L_WE[3]# L_OE[3]# L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
1M bytes
2M bytes L_WE[3]# L_OE[3]# L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
1M bytes
2M bytes
Memory
A2
L
Size
I
Typical Local Memory Access Operations
M
L_WE[3]#
L_A[19] /
L_A[19]
L_A[19]
I
D2
----
----
----
----
N
Chip #3
A3
A
D3
L_OE[3]# L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
A3+1
D3+1
R
Read/Write Chip Select and High Address Bits
----
----
----
----
----
----
Y
A3+2
D3+2
A3+3
I
D3+3
----
----
----
----
----
----
14
Chip #2
N
A4
F
A4+1
----
----
----
----
----
----
O
R
A4+2
D4
L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
M
----
----
----
A4+3
D4+1
Chip #1
A
D4+2
T
I
----
----
----
XpressFlow Engine
D4+3
A5
O
N
L_WE[0]# L_OE[0]#
L_WE[0]# L_OE[0]#
L_WE[0]# L_OE[0]#
Rev. 4.5 – February
Chip #0
D5
A6
SC220
D6