am79c970 Advanced Micro Devices, am79c970 Datasheet - Page 126

• Manufacturer Part Number: am79c970
• Description: Pcnettm-pci Single-chip Ethernet Controller For Pci Local Bus
• Manufacturer: Advanced Micro Devices

RMD2
Bit
31–24 RCC
23–16 RPC
Name
Description
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.
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
P R E L I M I N A R Y
Am79C970
15–12 ZEROS
11–0
RMD3
Bit
31–0
MCNT
Name
RES
requirement for a runt to pass the
internal
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).
PCI
counter may not be compatible
with the ILACC RPC definition.
This field is reserved. PCnet-PCI
controller will write ZEROs to
these locations.
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.
Description
Reserved locations.
implementation
address
The PCnet-
AMD
matching
of
1-993
this