參數(shù)資料
型號(hào)： AM79C960KCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： PCnetTM-ISA Single-Chip Ethernet Controller
中文描述： 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP120
封裝： PLASTIC, QFP-120
文件頁(yè)數(shù)： 60/127頁(yè)
文件大?。?/td> 814K
代理商： AM79C960KCW
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P R E L I M I N A R Y
AMD
1-402
Am79C960
MERR assertion will set the ERR
bit.
MERR is set by the Bus Interface
Unit and cleared by writing a “1”.
Writing a “0” has no effect. MERR
is cleared by RESET or by setting
the STOP bit.
Receive Interrupt is set after re-
ception of a receive frame and
toggling of the OWN bit in the last
buffer in the Receive Descriptor
Ring.
When RINT is set, IRQ is as-
serted if IENA = 1 and the mask
bit RINTM (CSR3.10) is clear.
RINT is set by the Buffer Man-
agement Unit after the last
receive buffer has been updated
and cleared by writing a “1”. Writ-
ing a “0” has no effect. RINT is
cleared by RESET or by setting
the STOP bit.
Transmit Interrupt is set after
transmission of a transmit frame
and toggling of the OWN bit in the
last buffer in the Transmit De-
scriptor Ring.
When TINT is set, IRQ is as-
serted if IENA = 1 and the mask
bit TINTM (CSR3.9) is clear.
TINT is set by the Buffer Man-
agement Unit after the last
transmit buffer has been updated
and cleared by writing a “1”.
Writing a “0” has no effect. TINT
is cleared by RESET or by setting
the STOP bit.
Initialization Done indicates that
the initialization sequence has
completed. When IDON is set,
PCnet-ISA controller has read
the Initialization block from
memory.
When IDON is set, IRQ is as-
serted if IENA = 1 and the mask
bit IDONM (CSR3.8) is clear.
IDON is set by the Buffer Man-
agement
Unit
initialization block has been read
from memory and cleared by
writing a “1”. Writing a “0” has no
effect. IDON is cleared by RE-
SET or by setting the STOP bit.
Interrupt Flag indicates that one
or more of the following interrupt
causing conditions has occurred:
BABL, MISS, MERR, MPCO,
RCVCCO, RINT, TINT, IDON,
JAB or TXSTRT; and its associ-
ated mask bit is clear. If IENA = 1
10
RINT
9
TINT
8
IDON
after
the
7
INTR
and INTR is set, IRQ will be
active.
INTR is cleared automatically
when the condition that caused
interrupt is cleared.
INTR is read only. INTR is
cleared by RESET or by setting
the STOP bit.
Interrupt Enable allows IRQ to be
active if the Interrupt Flag is set. If
IENA = “0” then IRQ will be dis-
abled regardless of the state of
INTR.
IENA is set by writing a “1” and
cleared by writing a “0”. IENA is
cleared by RESET or by setting
the STOP bit.
Receive On indicates that the
Receive function is enabled.
RXON is set if DRX (CSR15.0) =
“0” after the START bit is set. If
INIT and START are set to-
gether, RXON will not be set until
after the initialization block has
been read in.
RXON is read only. RXON is
cleared by RESET or by setting
the STOP bit.
Transmit On indicates that the
Transmit function is enabled.
TXON is set if DTX (CSR15.1) =
“0” after the START bit is set. If
INIT and START are set to-
gether, TXON will not be set until
after the initialization block has
been read in.
TXON is read only. TXON is
cleared by RESET or by setting
the STOP bit.
Transmit Demand, when set,
causes the Buffer Management
Unit to access the Transmit
Descriptor Ring without waiting
for the poll-time counter to
elapse. If TXON is not enabled,
TDMD bit will be reset and no
Transmit Descriptor Ring access
will occur. TDMD is required to
be set if the DPOLL bit in CSR4 is
set; setting TDMD while DPOLL
=
0
merely
PCnet-ISA controller’s response
to a Transmit Descriptor Ring En-
try.
TDMD is set by writing a “1”. Writ-
ing a “0” has no effect. TDMD will
be cleared by the Buffer Manage-
ment Unit when it fetches a
Transmit Descriptor. TDMD is
cleared by RESET or by setting
the STOP bit.
6
IENA
5
RXON
4
TXON
3
TDMD
hastens
the
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