Adaptec AIC-6915 Informações Técnicas descarregar pdf (Página 150)

7-78

AIC-6915 Ethernet LAN Controller Programmer’s Manual

MskRandomNum Register

Type: R/W

Internal Registers Su/jointfilesconvert/419897/bgroup: MAC Registers

Byte Address: 5028h - 502Bh

TotalTxCnt Register

Type: R/W

Internal Registers Su/jointfilesconvert/419897/bgroup: MAC Registers

Byte Address: 5034h- 5037h

Table 7-101. MskRandomNum Register

Bit(s) rw

Reset

Value Description/Function

31:10 r/w 0

Reserved:

Always read as 0.

9:0 r/w 0

MskRandomNum:

This is the sliding window mask result on

ANDOM

truncated binary exponential backoff algorithm. For example, only

the LSB of RandomNumGen is evaluated to determine the number

of slot times of delay before the first retransmission. It may be either

0 or 1. Only the 2 least-significant-bits of

ANDOM

are

evaluated before the second retransmission. It may be 0, 1, 2, or 3

slot times, etc. This field should only be written for test purposes,

such as for loading a predictable number rather than a random

number.

Table 7-102. TotalTxCnt Register

Bit(s) rw

Reset

Value Description/Function

31:16 r/w 0

Reserved:

Always read as 0.

15:0 r/w 0

TotalTxByteCnt:

This field is used for counting the total number of

bytes transmitted on the wire for the current packet, including all

bytes from collided attempts. It should only be written for test

purposes.

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 ... 189 190

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