CX82100 Home Network Processor Data Sheet
7.2
Parameterized Values Used in Implementation
Table 7-1 shows the values of the standard parameters used in the EMAC
implementation. These parameters are defined in sections 4.4.2.1 of Reference [4] and
4.4.2.3 of Reference [5]. The value specified for the Interframe Gap (IFG) parameter
determines the speed of the Ethernet. It is defined to be 96 µs for 1 Mb/s implementation,
9.6 µs for 10 Mb/s implementation, and 0.96 µs for 100 Mb/s implementation. Only the
10 Mb/s and 100 Mb/s implementations are supported in the HNP. The IFG parameter is
programmable through the Ethernet Network Access Register (bits 17:16 of E_NA_1 and
E_NA_2 for EMAC1 and EMAC2, respectively).
Table 7-1. Parameterized Values Implemented in EMAC
Parameter
Values
SlotTime
512 bit times
programmable
16
IFG (Interframe Gap)
AttemptLimit
BackoffLimit
JamSize
10
32 bits
MaxFrameSize
MinFrameSize
AddressSize
1518 bytes
512 bits (64 bytes)
48 bits
101306C
Conexant Proprietary and Confidential Information
7-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
