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
EA218
6+2 Ports 10Mb Ethernet Access Controller
2.4 10Mb Serial Interface for Port 0 through 7
ꢀ Fully compliant with IEEE 802.3 10M bit Serial Interface Stan-
dard for connecting with external 10Mbps Ethernet Physical
Layer Transceiver
ꢀ Supports 10Mbps 10BaseT serial interface
ꢀ Supports both half and full duplex operation
2.4.1 Pin Description
Symbol
Tn_RXD
Type
Name and Functions
TTL In Receive Data – (one for each 10M bit Serial Interface Port) a receive data stream.
(5VT)
Tn_RXC
Tn_TXC
Tn_TXEN
Tn_TXD
TTL In Receive Clock – (one for each 10M bit Serial Interface Port) from external phy for sampling the
(5VT)
TTL In Transmit Clock – (one for each 10M bit Serial Interface Port) a continuous clock input with
(5VT) 35% to 65% duty cycles.
receive data from Tn_RXD input
CMOS Transmit Enable – (one for each 10M bit Serial Interface Port)
Output
CMOS Transmit Data – (one for each 10M bit Serial Interface Port) a transmit data stream.
Output
CMOS Loop Back Enable – (one for each 10M bit Serial Interface Port) The polarity of this signal is
Output programmable via Port Configuration Register
Tn_LPBK
ꢁ
ꢁ
CMOS Full Duplex Mode – (one for each 10M bit Serial Interface Port) The polarity of this signal is
Output programmable via Port Configuration Register
Tn_FD
Tn_COL
TTL In Collision Detected – (one for each 10M bit Serial Interface Port)
(5VT)
Tn_CRS
Tn_LNK
TTL In Carrier Sense – (one for each 10M bit Serial Interface Port)
(5VT)
TTL In Link Status – (one for each 10M bit Serial Interface Port) The polarity of this signal is pro-
grammable via Port Configuration Register
ꢁ
(5VT)
Note:
“n” is the port number [7:0]
ꢁ
These signals have programmable output polarity.
100 nsec
TXC
TXEN
TXD
10M bit Serial Interface – Transmit Timing
© 1998 Zarlink Semiconductor, Inc.
18
Rev. 2.1- February, 1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
