TC9208M-DS-R06 datasheet(35/53 Pages) ETC1

35 / 53 page

TC9208M

Preliminary Data Sheet

DisFwPres

Whenever backpressure is enabled, in case of extreme congestion (memory

overload) forward pressure is also executed unless deactivated by this bit. Forward

pressure is never executed when backpressure is disabled. Setting this bit to ‘1’ will

disable forward pressure for all half duplex ports. Default is ‘0’.

DisBPBk

Setting this bit to ‘1’ will cause no backoff to be executed when a half duplex port is

in backpressure mode. This means a new collision can be forced immediately after

the previous one if carrier sense is observed. Setting this bit to ‘0’ will enable a very

aggressive backoff to be executed (recommended). Default value is its

corresponding DisBPBk pin value.

FrcFdxFC

Setting this bit to ‘1’ will instruct TC9208M to disregard the auto-negotiation result

for the full duplex flow control ability. Link partner will be considered full duplex flow

control able. This setting is effective only for ports configured in 10/100 Mbps speed

modes. Default is ‘0’.

FrcFdxFCGb

Setting this bit to ‘1’ will instruct TC9208M to disregard the auto-negotiation result

for the full duplex flow control ability. Link partner will be considered able to execute

symmetric and asymmetric towards link partner full duplex flow control. This setting

is effective only for ports configured in 1000 Mbps speed mode. Default is ‘0’.

DirFCAdr

Setting this bit to ‘1’ will enable direct flow control addressing mechanism, otherwise

direct flow control addressing is disabled. Default is ‘0’.

11.3.5

Backpressure Time Value Register

- Address: 31h, 30h

7 6 5 4 3 2 1 0

BPTimeValue

15 14 13 12 11 10 9 8

31h

30h

Bit(s)

Field

Description

15 – 0

BPTimeValue

Backpressure time value

BPTimeValue

A 16-bit value used to compute internal time value for backpressure operation.

Default value is ‘0000100000000000’(2048).

Confidential.

35/53

August 1, 2003

TC9208M-DS-R06

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