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
4.3 Local Memory Interface:
Local Memory Interface:
L_CLK
L_CLK
L_D[31:0]
L_A[19:2]
L3-max
L3-min
L1
L2
L_D[31:0]
L4-max
L4-min
Local Memory Interface –
Input setup and hold timing
L5-max
L5-min
L_CS[3:0]#
L_ADSC#
L_BWE[3:0]#
L_WE#]
L_CLK
L6-max
L6-min
L10
L3-min
L_D[31:0]
L7-max
L7-min
Local Memory Interface –
Output float delay timing
L8-max
L8-min
L9-max
L9-min
L_OE#
Local Memory Interface –
Output valid delay timing
-40
-50
-66
Symbol
Parameter
Min Max Min Max Min Max
(ns) (ns) (ns) (ns) (ns) (ns)
Note:
L1
L2
L3
L4
L6
L7
L8
L9
L10
L_D[31:0]# input set-up time
L_D[31:0]# input hold time
L_D[31:0]# output valid delay
L_A[19:2] output valid delay
L_ADSC# output valid delay
L_BWE[3:0]# output valid delay
L_WE# output valid delay
L_OE# output valid delay
6.5
3
5.5
2.5
4
4
2
3
3
3
3
3
3
5
17
17
17
17
17
17
22
13
13
13
13
13
13
18
10 CL = 30pf
10 CL = 30pf
10 CL = 30pf
10 CL = 30pf
10 CL = 10pf
10 CL = 10pf
14
5
4
5
4
5
4
5
4
5
4
L_D[31:0]# output float delay
AC Characteristics – Local Memory Interface
© 1998 Vertex Networks, Inc.
27
Rev. 4.5 – February
1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
