MEA-224 Zarlink Semiconductor, Inc., MEA-224 Datasheet - Page 18

• Manufacturer Part Number: MEA-224
• Description: 4-Port, Layer 2 Fast Ethernet Access Controller
• Manufacturer: Zarlink Semiconductor, Inc.

XpressFlow-2001 Series –
Ethernet Switch Chip-set
4.4 MII Interface
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4.4.1 Pin Description
©
1997
Fully compliant with IEEE 802.3u Media Inde-
pendent Interface for connecting with external
10/100M Ethernet Physical Layer Transceiver
Supports both 10Mbps 10BaseT interface and
100Mbps 100BaseTx interface
Supports both half and full duplex operation
Shared Station Management interface (one for
all MII channels with in the Access Controller)
Note: “m” is the port number [3:0].
M_MDC
M_MDIO
Mm_RXD[3:0] TTL In
Mm_RXDV
Mm_RXC
Mm_RXER
Mm_TXER
Mm_TXC
Mm_TXEN
Mm_TXD[3:0] CMOS
Mm_COL
Mm_CRS
Mm_LNK
(57(; (7:25.6
Symbol
P R E L I M I N A R Y
These signals have programmable output polarity.
CMOS
Output
CMOS
Output
CMOS
Output
Output
TTL In
TTL In
TTL In
TTL In
TTL In
TTL In
TTL In
IO-TS
(5VT)
(5VT)
(5VT)
(5VT)
(5VT)
(5VT)
(5VT)
(5VT)
(5VT)
Type
TTL
Name & Functions
MII Management Data Clock – (common for all MII Ports) used to syn-
chronize the MII data stream (MDIO) for transferring between the Ac-
cess Controller and the MII Tranceivers.
MII Management Data I/O – (common for all MII Ports) a serial man-
agement data stream synchronous with MDC.
Receive Data [3:0] – (one set for each MII Port) a four-bit transmit data
nibble. Bit 0 is the least significant bit, and bit 3 is the most significant
bit.
Receive Data Valid – (one for each MII Port) instructs the MAC to be-
gin moving data nibbles from the receive data lines.
Receive Clock – (one for each MII Port) a 25MHz clock input with 35%
to 65% duty cycles.
Receive Error – (one for each MII Port)
Transmit Error – (one for each MII Port)
Transmit Clock – (one for each MII Port) a continuous clock input with
35% to 65% duty cycles.
Transmit Enable – (one for each MII Port) instructs the transceiver to
begin moving data nibbles on the transmit data lines.
Transmit Data [3:0] – (one set for each MII Port) a four-bit transmit
data nibble. Bit 0 is the least significant bit, and bit 3 is the most signifi-
cant bit.
Collision Detected – (one for each MII Port)
Carrier Sense – (one for each MII Port)
Link Status – (one for each MII Port)
The polarity of this signal is programmable via Port Configuration Reg-
ister
4-Port 10/100M Ethernet Access Controller
Page: 18
D A T A
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All ports can also support 10Mbps Serial In-
terface
If 10Mbps Serial Interface is used, the MII
port pin assignment are re-mapped for
10Mbps Serial Interface.
S H E E T
Rev. 4.0 –December, 1997
EA-224