TXC-06880BIOG Transwitch Corporation, TXC-06880BIOG Datasheet - Page 13

• Manufacturer Part Number: TXC-06880BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06880BIOG

• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

PRELIMINARY TXC-06880-MB, Ed. 4
February 2005
2.1.4 Ethernet Interface Description For Different Modes
Figure 3. GMII (1000 Mbit/s) Only Interface Connection
The Envoy-CE2 has 16 Ethernet Ports: Ports 0 to 15. Ports 0 to 7 are assigned to
Configurable MAC A (CMAC A) and Ports 8 to 15 are assigned to Configurable MAC B
(CMAC B). Each CMAC can be configured as 8 SMII ports, 2 Extended SMII ports (larger
buffers) or 1 triple speed GMII/MII port. Device pins CFGCMACA(1:0) and CFGCMACB(1:0)
are used to configure CMAC A and CMAC B, respectively.
When CMAC A is configured in GMII/MII mode (CFGCMACA = 01), port 0 will be in GMII or
MII mode (MII mode is based on programmable bits “Interface Mode”: register 4004 bits 8-9)
and ports 1 to 7 are inactive. When CMAC A is configured in Extended SMII mode
(CFGCMACA = 10), ports 0 and 4 will be in extended SMII mode and ports 1, 2, 3, 5, 6, and 7
are inactive. When CMAC A is configured in SMII mode (CFGCMACA = 11), ports 0 to 7 will
be in SMII mode.
When CMAC B is configured in GMII/MII mode (CFGCMACB = 01), port 8 will be in GMII or
MII mode (MII mode is based on programmable bits “Interface Mode”: register 4804 bits 8-9)
and ports 9 to 15 are inactive. When CMAC B is configured in Extended SMII mode
(CFGCMACB = 10), ports 8 and 12 will be in extended SMII mode and ports 9, 10, 11, 13, 14,
and 15 are inactive. When CMAC B is configured in SMII mode (CFGCMACB = 11), ports 8 to
15 will be in SMII mode.
Note: Series termination resistor values are dependent on the selection of the Ethernet PHY.
Please consult the specification of the Ethernet PHY for series termination resistor values
SMIIREFCLK(A,B)
G(A,B)MTXCLK
G(A,B)TXCLKO
G(A,B)TXCLKI
G(A,B)RXCLK
G(A,B)RXDV
G(A,B)RXER
G(A,B)TXEN
G(A,B)TXER
RX[0-3](A,B)
RX[4-7](A,B)
TX[0-3](A,B)
TX[4-7](A,B)
G(A,B)COL
G(A,B)CRS
- Functional Description -
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SMII Reference Clock is needed for
Ethernet Statistics Clocking
•
•
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Use External Clock or Clock from PHY
125 MHz Oscillator
125 MHz Reference Clock
TxData[0-3]
TxData[4-7]
GMII 125 MHz TxClk
TxEnable
TxError
RxClk (2.5/25/125 MHz)
RxData[0-3]
RxData[4-7]
RxDataValid
RxError
Collision (Half Duplex Only)
Carrier (CRS) (Half Duplex Only)
MII 2.5/25 MHz Clock
Envoy-CE2 Device
DATA SHEET
TXC-06880
13 o f 12 2