P
R
E
L
I
M
I
N
A
R
Y
D
A
T
A
S
H
E
E
T
XpressFlow-2001 Series –
Ethernet Switch Chip-set
EA-224
4-Port 10/100M Ethernet Access Controller
4.3.2 Bus Cycle Waveforms
S_CLK
S_MSGEN#
S_D[31:0]
C0
C1
D0
D1
D2
D3
D4
D5
EoF
S_EOF#
S_IRDY
XpressFlow Bus Data Transfer Cycle
S_CLK
S_MSGEN#
S_D[31:0]
S_EOF#
C0
C1
C0
C1 EOF
C0
C1
S_TABT#
Command Cycle
Data Xfer w/o Data
Aborted Command
Other XpressFlow Bus Cycles
S_CLK
S_REQ[k]#
S_REQ[j]#
S_HPREQ#
High Priority Request pre-empts the low priority request.
© 1997 Zarlink Semiconductor Inc.
Page: 16
Rev. 4.0 –December, 1997