TXC-06885BIOG Transwitch Corporation, TXC-06885BIOG Datasheet - Page 12

• Manufacturer Part Number: TXC-06885BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06885BIOG

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

Envoy-CE4 Device
DATA SHEET
TXC-06885
1 2 o f 12 8
2.1.4 Ethernet Interface Description For Different Modes
The following sequence needs to be performed when switching from GMII mode to MII mode
and vice versa:
The Envoy-CE4 has 32 Ethernet Ports: Ports 0 to 31. Ports 0 to 7 are assigned to
Configurable MAC A (CMAC A), Ports 8 to 15 are assigned to Configurable MAC B (CMAC
B), Ports 16 to 23 are assigned to Configurable MAC C (CMAC C), and Ports 24 to 31 are
assigned to Configurable MAC D (CMAC D). 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), CFGCMACB(1-0), CFGCMACC(1-0), and CFGCMACD(1-0) are used to
configure CMAC A, CMAC B, CMAC C, and CMAC D, 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.
When CMAC C is configured in GMII/MII mode (CFGCMACC = 01), port 16 will be in GMII or
MII mode (MII mode is based on programmable bits “Interface Mode”: Register 5004 bits 8-9)
and ports 17 to 23 are inactive. When CMAC C is configured in Extended SMII mode
(CFGCMACC = 10), ports 16 and 20 will be in extended SMII mode and ports 17, 18, 19, 21,
22, and 23 are inactive. When CMAC C is configured in SMII mode (CFGCMACC = 11), ports
16 to 23 will be in SMII mode.
When CMAC D is configured in GMII/MII mode (CFGCMACD = 01), port 24 will be in GMII or
MII mode (MII mode is based on programmable bits “Interface Mode”: Register 5804 bits 8-9)
and ports 25 to 31 are inactive. When CMAC D is configured in Extended SMII mode
(CFGCMACD = 10), ports 24 and 28 will be in extended SMII mode and ports 25, 26, 27, 29,
30, and 31 are inactive. When CMAC D is configured in SMII mode (CFGCMACD = 11), ports
24 to 31 will be in SMII mode.
• Enable Soft Reset for the MAC (Register 0x4000 Bit 31 for Port 0)
• Reprogram Interface Mode Register (Register 0x4004 Bits 8-9)
• Remove Soft Reset
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Functional Description
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PRELIMINARY TXC-06885-MB, Ed. 6A
February 2005