參數(shù)資料
型號: AM79C978
廠商: Advanced Micro Devices, Inc.
英文描述: Single-Chip 1/10 Mbps PCI Home Networking Controller
中文描述: 單芯片的1 / 10 Mbps的家庭網(wǎng)絡(luò)控制器的PCI
文件頁數(shù): 87/261頁
文件大?。?/td> 3803K
代理商: AM79C978
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頁當(dāng)前第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頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁第249頁第250頁第251頁第252頁第253頁第254頁第255頁第256頁第257頁第258頁第259頁第260頁第261頁
Am79C978
87
The LED pins can be configured to operate in either
open-drain mode (active low) or in totem-pole mode
(active high). The output can be stretched to allow the
human eye to recognize even short events that last
only several microseconds. After H_RESET, the five
LED outputs are configured as shown in Table 17.
Table 17.
LED Default Configuration
For each LED register, each of the status signals is
AND
d with its enable signal, and these signals are all
OR
d together to form a combined status signal. Each
LED pin combined status signal can be programmed to
run 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 register 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 to 3 clocks of stretched LED output, or 52
ms to 78 ms. See Figure 45.
Power Savings Mode
Power Management Support
The controller supports power management as defined
in the PCI Bus Power Management Interface Specifica-
tion V1.1 and Network Device Class Power Manage-
ment Reference Specification V1.0a.These
specifications define the network device power states,
PCI power management interface including the Capa-
bilities Data Structure and power management regis-
ters block definitions, power management events, and
OnNow network wake-up events.
The general scheme for the Am79C978 power man-
agement is that when a PCI wake-up event is detected,
a signal is generated to cause hardware external to the
Am79C978 device to put the computer into the working
(S0) mode.
Figure 45.
LED Control Logic
The Am79C978 device supports three types of wake-
up events:
1. Magic Packet Detect
2. OnNow Pattern Match Detect
3. Link State Change
Figure 46 shows the relationship between these wake-
up events and the various outputs used to signal to the
external hardware.
OnNow Wake-Up Sequence
The system software enables the PME pin by setting
the PME_EN bit in the PMCSR register (PCI configura-
tion registers, offset 44h, bit 8) to 1. When a wake-up
event is detected, the controller sets the PME_STATUS
bit in the PMCSR register (PCI configuration registers,
offset 44h, bit 15). Setting this bit causes the PME sig-
nal to be asserted. Assertion of the PME signal causes
external hardware to wake up the CPU. The system
software then reads the PMCSR register of every PCI
device in the system to determine which device as-
serted the PME signal.
When the software determines that the signal came
from the controller, it writes to the device's PMCSR to
put the device into power state D0. The software then
writes a 0 to the PME_STATUS bit to clear the bit and
turn off the PME signal, and it calls the device's soft-
ware driver to tell it that the device is now in state D0.
The system software can clear the PME_STATUS bit
either before, after, or at the same time that it puts the
device back into the D0 state.
LED
Output
Indication
Driver Mode
Open Drain -
Active Low
Open Drain -
Active Low
Open Drain -
Active Low
Open Drain -
Active Low
Open Drain -
Active Low
Pulse Stretch
LED0
Link Status
Enabled
LED1
Receive
Status
Enabled
LED2
Power
Enabled
LED3
Transmit
Status
Enabled
LED4
Speed
Enabled
COL
COLE
FDLS
FDLSE
LNKS
LNKSE
RCV
RCVE
RCVM
RCVME
XMT
XMTE
To
Pulse
Stretcher
MR_SPEED_SEL
100E
MPS
MPSE
POWER
POWERE
22206B-49
相關(guān)PDF資料
PDF描述
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)
AM79C982-8JC basic Integrated Multiport Repeater (bIMR)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C978A 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
AM79C978AKC\\W 制造商:Advanced Micro Devices 功能描述:
AM79C978AKC\W 制造商:Advanced Micro Devices 功能描述:
AM79C978AKCW 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