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
-40
-50
-66
Symbol
Parameter
Min (ns) Max Min (ns) Max Min (ns) Max
Note:
CL = 50pf
(ns)
(ns)
(ns)
S1
S2
S_D[31:0] output valid delay
S_MSGEN# output valid delay
S_EOF# output valid delay
S_IRDY output valid delay
S_TABT# output valid delay
S_HPREQ# output valid delay
6
6
6
6
6
6
6
6
14
14
14
14
14
14
14
14
18
18
18
18
5
5
5
5
5
5
5
5
11
11
11
11
11
11
11
11
15
15
15
15
4
4
4
4
4
4
4
4
8.5
8.5
8.5
8.5
8.5
8.5
8.5
8.5
12
CL = 50pf
CL = 50pf
CL = 50pf
CL = 50pf
CL = 50pf
CL = 20pf
CL = 50pf
S3
S4
S6
S7
S8
S_GNT[7:0]# output valid delay
S_OVLD# output valid delay
S_D[31:0] output float delay
S_MSGEN# output float delay
S_EOF# output float delay
S_IRDY output float delay
S_D[31:0] input set-up time
S_D[31:0] input hold time
S_MSGEN# input set-up time
S_MSGEN# input hold time
S_EOF# input set-up time
S_EOF# input hold time
S9
S12
S13
S14
S15
S17
S18
S19
S20
S21
S22
S23
S24
S27
S28
S29
S30
S31
S32
12
12
12
2
1.5
4.5
1.5
4.5
1.5
4.5
1.5
4.5
4.5
4.5
3.5
4.5
5
1
5.5
2
3.5
1
5.5
2
3.5
1
5.5
2
3.5
1
S_IRDY input set-up time
S_IRDY input hold time
5.5
5.5
5.5
4.5
5.5
6
3.5
3.5
3.5
2.5
3.5
4
S_TABT# input set-up time
S_TABT# input hold time
S_HPREQ# input set-up time
S_HPREQ# input hold time
S_REQ[7:0]# input set-up time
S_REQ[7:0]# input hold time
5.5
4.5
3.5
AC Characteristics -- XpressFlow Bus Interface
© 1998 Vertex Networks, Inc.
25
Rev. 4.5 – February
1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
