- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366550 > AM79C970 (Advanced Micro Devices, Inc.) PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus PDF資料下載
參數(shù)資料
| 型號： | AM79C970 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus |
| 中文描述： | PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線 |
| 文件頁數(shù)： | 76/168頁 |
| 文件大?。?/td> | 943K |
| 代理商： | AM79C970 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁當(dāng)前第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁
P R E L I M I N A R Y
AMD
1-943
Am79C970
LED
output
Default
Interpretation Drive Enable Output Polarity
Default
Default
LNKST
Link Status
Enabled
Active LOW
LED1
Receive
Enabled
Active LOW
LED3
Transmit
Enabled
Active LOW
For each LED register, each of the status signals is
ANDed with its enable signal, and these signals are all
ORed together to form a combined status signal. Each
LED pins combined status signal runs to a pulse
stretcher, which consists of a 3-bit shift register clocked
at 38 Hz (26 ms). The data input of each shift register is
normally at logic 0. The OR gate output for each LED
register asynchronously sets all three bits of its shift reg-
ister when the output becomes asserted. The inverted
output of each shift register is used to control an LED
pin. Thus the pulse stretcher provides 2–3 clocks of
stretched LED output, or 52 ms to 78 ms.
RCV
RCV E
XMT
XMT E
LNK
LNK E
RXPOL
RXPOL E
JAB
JAB E
COL
COL E
RCVM
RCVM E
To
Pulse
Stretcher
18220C-31
Figure 29
.
LED Control Logic
The diagram above shows the LED signal circuit that ex-
ists for each LED pin within the PCnet-PCI controller.
H_RESET, S_RESET, and STOP
There are three different types of RESET operations
that may be performed on the PCnet-PCI device, H_RE-
SET, S_RESET and STOP. These names have been
used throughout the document. The following is a de-
scription of each type of RESET operation:
H_RESET
H_RESET= HARDWARE_RESET is a PCnet-PCI RE-
SET operation that has been created by the proper as-
sertion of the
RST
PIN of the PCnet-PCI device. When
the minimum pulse width timing as specified in the
RST
pin description has been satisfied, then an internal RE-
SET operation will be performed.
H_RESET will RESET all of or some portions of CSR0,
3, 4, 15, 58, 80, 82, 100, 112, 114, 122, 124 and 126 to
default values. H_RESET will RESET all of or some por-
tions of BCR 2, 4, 5, 6, 7, 18, 19, 20, 21 to default values.
H_RESET will reset the Command register in the PCI
configuration space. H_RESET will cause the
microcode program to jump to its RESET state. Follow-
ing the end of the H_RESET operation, the PCnet-PCI
controller will attempt to read the EEPROM device
through the EEPROM Microwire interface. H_RESET
resets the T-MAU into the link fail state.
S_RESET
S_RESET = SOFTWARE_RESET is a PCnet-PCI RE-
SET operation that has been created by a read access
to the RESET REGISTER which is located at offset
14hex from the PCnet-PCI I/O base address.
S_RESET will RESET all of or some portions of CSR0,
3, 4, 15, 80, 100 and 124 to default values. S_RESET
will not affect any of the BCR and PCI configuration
space locations. S_RESET will cause the microcode
program to jump to its RESET state. Following the end
of the S_RESET operation, the PCnet-PCI controller
will NOT attempt to read the EEPROM device.
S_RESET sets the T-MAU into the link fail state.
Note that S_RESET will not cause a deassertion of the
REQ
signal, if it happens to be active at the time of the
read to the reset register. The
REQ
signal will remain
active until the
GNT
signal is asserted. Following the
read of the RESET register, on the next clock cycle after
the
GNT
signal is asserted, the PCnet-PCI controller will
deassert the
REQ
signal. No bus master accesses will
have been performed during this brief bus ownership
period.
STOP
STOP is a PCnet-PCI RESET operation that has been
created by the ASSERTION of the STOP bit in CSR0.
That is, a STOP RESET is generated by writing a ONE
to the STOP bit of CSR0 when the STOP bit currently
has a value of ZERO. If the STOP bit value is currently a
ONE and a ONE is rewritten to the STOP bit, then NO
STOP RESET will be generated.
STOP will RESET all or some portions of CSR0, 3, and 4
to default values. STOP will not affect any of the BCR
and PCI configuration space locations. STOP will cause
the microcode program to jump to its RESET state. Fol-
lowing the end of the STOP operation, the PCnet-PCI
controller will NOT attempt to read the EEPROM device.
For the identity of individual CSRs and bit locations that
are affected by STOP, see the individual CSR register
descriptions. Setting the STOP bit does not affect
theT-MAU.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C971VCW | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| AM79C971 | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| AM79C971KCW | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE |
| AM79C972BKCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C970A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product |
| AM79C970AKC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product |
| AM79C970AKC\\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述: |
| AM79C970AKC\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。