AM79C970 datasheet(126/168 Pages) AMD

126 / 168 page

P R E L I M I N A R Y

AMD

1-993

Am79C970

RMD2

Bit

Name

Description

31–24

RCC

Receive Collision Count. Indi-

cates the accumulated number of

collisions on the network since

the last packet was received, ex-

cluding collisions that occurred

during transmissions from this

node. The PCnet-PCI implemen-

tation of this counter may not be

compatible with the ILACC RCC

definition. If network statistics are

to be monitored, then CSR114

should be used for the purpose of

monitoring Receive collisions in-

stead of these bits.

23–16

RPC

Runt Packet Count. Indicates the

accumulated number of runts

that were addressed to this node

since the last time that a receive

packet

was

successfully

re-

ceived and its corresponding

RMD2 ring entry was written to

by the PCnet-PCI controller. In

order to be included in the RPC

value, a runt must be long

enough to meet the minimum re-

quirement of the internal address

matching logic.

The minimum

requirement for a runt to pass the

internal

address

matching

mechanism is: 18 bits of valid

preamble plus a valid SFD de-

tected, followed by 7 bytes of

frame data. This requirement is

unvarying, regardless of the ad-

dress matching mechanisms in

force at the time of reception.

(i.e. physical, logical, broadcast

or promiscuous).

The PCnet-

PCI

implementation

this

counter may not be compatible

with the ILACC RPC definition.

15–12 ZEROS

This field is reserved. PCnet-PCI

controller will write ZEROs to

these locations.

11–0

MCNT

MESSAGE BYTE COUNT is the

length in bytes of the received

message, expressed as an un-

signed binary integer. MCNT is

valid only when ERR is clear and

ENP is set. MCNT is written by

the PCnet-PCI controller and

cleared by the host.

RMD3

Bit

Name

Description

31–0

RES

Reserved locations.

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