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參數(shù)資料
| 型號： | AM79C978AVCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| 中文描述： | 5 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144 |
| 封裝： | TQFP-144 |
| 文件頁數(shù)： | 115/256頁 |
| 文件大?。?/td> | 3505K |
| 代理商： | AM79C978AVCW |
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Am79C978A
115
AD[15:8] is Byte 1, and AD[7:0] is
Byte 0.
Byte swap only affects data
transfers that involve the FIFOs.
Initialization block transfers are
not affected by the setting of the
BSWP bit. Descriptor transfers
are not affected by the setting of
the BSWP bit. RDP, RAP, BDP
and PCI configuration space ac-
cesses are not affected by the
setting of the BSWP bit. Address
PROM transfers and Expansion
ROM accesses are not affected
by the setting of the BSWP bit.
Note that the byte ordering of
the PCI bus is defined to be little
Endian. BSWP should not be
set to 1 when the Am79C978A
controller is used in a PCI bus
application.
This bit is always read/write ac-
cessible. BSWP is cleared by
H_RESET or S_RESET and is
not affected by STOP.
1-0
RES
Reserved locations. The default
values of these bits are zeros.
Writing a 1 to this bit has no effect
on device function. If a 1 is written
to these bits, then a 1 will be read
back. Existing drivers may write a
1 to these bits for compatibility,
but new drivers should write a 0
to these bits and should treat the
read value as undefined.
CSR4: Test and Features Control
Certain bits in CSR4 indicate the cause of an interrupt.
The register is designed so that these indicator bits are
cleared by writing ones to those bit locations. This
means that the software can read CSR4 and write back
the value just read to clear the interrupt condition.
Bit
Name
Description
31-16
RES
Reserved locations. Written as
zeros and read as undefined.
15
RES
Reserved location. It is OK for
legacy software to write a 1 to this
location. This bit must be set
back to 0 before setting INIT or
STRT bits.
This bit is always read/write ac-
cessible. This bit is cleared by
H_RESET or S_RESET and is
unaffected by the STOP bit.
14
DMAPLUS
Writing and reading from this bit
has no effect. DMAPLUS is al-
ways set to 1.
13
RES
Reserved Location. Written as
zero and read as undefined.
12
TXDPOLL
Disable Transmit Polling. If
TXDPOLL is set, the Buffer
Management Unit will disable
transmit polling. Likewise, if
TXDPOLL is cleared, automatic
transmit polling is enabled. If
TXDPOLL is set, TDMD bit in
CSR0 must be set in order to
initiate a manual poll of a trans-
mit descriptor. Transmit de-
scriptor polling will not take
place if TXON is reset. Transmit
polling will take place following
Receive activities.
This bit is always read/write ac-
cessible. TXDPOLL is cleared by
H_RESET or S_RESET and is
unaffected by the STOP bit.
11
APAD_XMT
Auto Pad Transmit. When set,
APAD_XMT enables the auto-
matic padding feature. Transmit
frames will be padded to extend
them to 64 bytes including FCS.
The FCS is calculated for the en-
tire frame, including pad, and ap-
pended after the pad field.
APAD_XMT will override the pro-
gramming of the DXMTFCS bit
(CSR15, bit 3) and of the
ADD_FCS bit (TMD1, bit 29).
This bit is always read/write ac-
cessible. APAD_XMT is cleared
by H_RESET or S_RESET and is
unaffected by the STOP bit.
10
ASTRP_RCV Auto Strip Receive. When set,
ASTRP_RCV enables the auto-
matic pad stripping feature. The
pad and FCS fields will be
stripped from receive frames and
not placed in the FIFO.
This bit is always read/write ac-
cessible. ASTRP_RCV is cleared
相關PDF資料 |
PDF描述 |
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| AM79C978 | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C981 | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C981JC | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C982 | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-4JC | basic Integrated Multiport Repeater (bIMR) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C978KC/W | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C978VC/W | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C979BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C98 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Twisted-Pair Ethernet Transceiver (TPEX) |
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