AM79C978 Advanced Micro Devices, AM79C978 Datasheet - Page 142

• Manufacturer Part Number: AM79C978
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• Manufacturer: Advanced Micro Devices

CSR112: Missed Frame Count
Bit
31-16 RES
15-0
CSR114: Receive Collision Count
Bit
31-16 RES
15-0
142
MFC
RCC
Name
Name
system
Am79C978
transfer. If this value of bus laten-
cy is exceeded, then a MERR will
be indicated in CSR0, bit 11, and
an interrupt may be generated,
depending upon the setting of the
MERRM bit (CSR3, bit 11) and
the IENA bit (CSR0, bit 6).
Reserved locations. Written as
zeros and read as undefined.
Missed Frame Count. Indicates
the number of missed frames.
Reserved locations. Written as
zeros and read as undefined.
Receive Collision Count. Indi-
cates the total number of colli-
The value in this register is inter-
preted as the unsigned number of
bus clock periods divided by two,
(i.e., the value in this register is
given in 0.1 ms increments). For
example, the value 0600h (1536
decimal) will cause a MERR to be
indicated after 153.6 ms of bus
latency. A value of 0 will allow an
infinitely long bus latency, i.e.,
bus timeout error will never oc-
cur.
These bits are read/write acces-
sible only when either the STOP
or the SPND bit is set. This regis-
ter is set to 0600h by H_RESET
or S_RESET and is unaffected by
STOP.
MFC will roll over to a count of 0
from the value 65535. The MFCO
bit of CSR4 (bit 8) will be set each
time that this occurs.
Read accessible always. MFC is
read only, write operations are ig-
nored.
H_RESET, or S_RESET or by
setting the STOP bit.
Description
Description
MFC
may
controller
insert
is
cleared
into
master
Am79C978
an
by
CSR116: OnNow Power Mode Register
Note: Bits 15-0 in this register are programmable
through the EEPROM.
Bit
31-16 RES
10 PME_EN_OVR PME_EN Overwrite. When this
9
8
LCDET
LCMODE
Name
sions
receiver since the last reset of the
counter.
RCC will roll over to a count of 0
from the value 65535. The
RCVCCO bit of CSR4 (bit 5) will
be set each time that this occurs.
These bits are read accessible al-
ways. RCC is read only, write op-
erations are ignored. RCC is
cleared
S_RESET, or by setting the
STOP bit.
Description
Reserved locations. Written as
zeros and read as undefined.
bit is set and the MPMAT or
LCDET bit is set, the PME pin will
always be asserted regardless of
the state of the PME_EN bit.
These bits are read/write accessi-
ble only when either the STOP bit
or the SPND bit is set. Cleared by
H_RESET and is not affected by
S_RESET or setting the STOP
bit.
Link Change Detected. This bit is
set when the MII auto-polling log-
ic detects a change in link status
and the LCMODE bit is set.
LCDET is cleared when power is
initially applied (POR).
This bit is always read/write ac-
cessible.
Link Change Wake-up Mode.
When this bit is set to 1, the
LCDET bit gets set when the MII
auto polling logic detects a Link
Change.
Read/Write accessible only when
either the STOP bit or the SPND
bit is set. Cleared by H_RESET
and is not affected by S_RESET
or setting the STOP bit.
encountered
by
H_RESET
by
the
or