參數(shù)資料
型號(hào)： AM79C971VCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
中文描述： 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP176
封裝： TQFP-176
文件頁(yè)數(shù)： 151/265頁(yè)
文件大?。?/td> 3190K
代理商： AM79C971VCW
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Am79C971
151
P R E L I M I N A R Y
interrupt channels to be shared
by multiple devices.
INTLEVEL should not be set to 1
when the Am79C971 controller is
used in a PCI bus application.
Read/Write accessible always.
INTLEVEL is cleared to 0 by
H_RESET and is unaffected by
S_RESET or by setting the STOP
bit.
6-4
RES
Reserved locations. Written as
zeros and read as undefined.
3
EADISEL
EADI Select. When set to 1, this
bit enables the three EADI inter-
face pins that are multiplexed
with other functions. EESK/LED1
becomes SFBD, EEDO/LED3
becomes SRD, LED2 becomes
SRDCLK, and SLEEP becomes
EAR. See the section on
External
Address Detection
for more de-
tails.
Read/Write accessible always.
EADISEL
is
H_RESET and is unaffected by
S_RESET or by setting the STOP
bit.
cleared
by
2
AWAKE
This bit selects one of two differ-
ent sleep modes.
If AWAKE is set to 1 and the
SLEEP pin is asserted, the
Am79C971 controller goes into
snooze mode. If AWAKE is
cleared to 0 and the SLEEP pin is
asserted, the Am79C971 control-
ler goes into coma mode. See the
section
Power Saving Modes
for
more details.
This bit only has meaning when
the 10BASE-T network interface
is selected.
Read/Write accessible always.
AWAKE is cleared to 0 by
H_RESET and is unaffected by
S_RESET or by setting the STOP
bit.
1
ASEL
Auto Select. When set, the
Am79C971 controller will auto-
matically select the operating me-
dia interface port. If ASEL has
been set to a 1, then when the MI-
IPD bit (BCR32, bit 14) is 1, the
MII port is selected. If the MIIPD
bit is 0, and then, if the 10BASE-
T transceiver is in the link pass
state (due to receiving valid frame
data and/or Link Test pulses or
the DLNKTST bit is set), the
10BASE-T port will be used. If the
MIIPD bit is 0 and the 10BASE-T
port is in the Link Fail state, the
AUI port will be used. Switching
between the ports will not occur
during transmission to avoid any
type of fragment generation.
The network port configurations
are found in Table 31.
When ASEL is set to 1 and the
MIIPD bit is 0, Link Beat Pulses
will
be transmitted
10BASE-T port, regardless of the
state of Link Status. When ASEL
is reset to 0, Link Beat Pulses will
only be transmitted on the
10BASE-T port when the PORT-
SEL bits of the Mode Register
(CSR15) have selected 10BASE-
T as the active port.
on
the
When ASEL is set to a 0, then the
selected network port will be de-
termined by the settings of the
PORTSEL bits of CSR15. When
ASEL is set to 1, the selected net-
work port may be determined
through software by reading the
MIIPD bit and, if MIIPD is 0, read-
ing the link status through BCR4
or another LED Control register if
it is programmed for link status.
The PORTSEL[1:0] bits do not
reflect the selected network port
when ASEL is 1. Read/Write ac-
cessible always. ASEL is set to 1
by H_RESET and is unaffected
by S_RESET or STOP.
0
XMAUSEL
Reserved location. Read/Write
accessible always. This reserved
location is cleared by H_RESET
and is unaffected by S_RESET or
STOP. Writing a 1 to this bit has
no effect on the operation of the
Am79C971 controller.
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