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AM79C978KC/W 参数 Datasheet PDF下载

AM79C978KC/W图片预览
型号: AM79C978KC/W
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片1/10 Mbps的PCI家庭网络控制器 [Single-Chip 1/10 Mbps PCI Home Networking Controller]
分类和应用: 控制器PC
文件页数/大小: 261 页 / 3499 K
品牌: AMD [ AMD ]
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S_RESET or setting the STOP  
bit.  
This bit is always read/write ac-  
cessible. COLE is cleared by  
H_RESET and is not affected by  
S_RESET or setting the STOP  
bit.  
5
RCVME  
Receive Match Status Enable.  
When this bit is set, a value of 1 is  
passed to the LEDOUT bit in this  
register when there is receive ac-  
tivity on the network that has  
passed the address match func-  
tion for this node. All address  
matching modes are included:  
physical, logical filtering, broad-  
cast, and promiscuous.  
BCR5: LED1 Status  
BCR5 controls the function(s) that the LED1 pin dis-  
plays. Multiple functions can be simultaneously en-  
abled on this LED pin. The LED display will indicate the  
logical OR of the enabled functions. BCR5 defaults to  
Receive Status (RCV) with pulse stretcher enabled  
(PSE = 1) and is fully programmable.  
This bit is always read/write ac-  
cessible. RCVME is cleared by  
H_RESET and is not affected by  
S_RESET or setting the STOP  
bit.  
Note: When LEDPE (BCR2, bit 12) is set to 1, pro-  
gramming of the LED1 Status register is enabled.  
When LEDPE is cleared to 0, programming of the  
LED1 register is disabled. Writes to those registers will  
be ignored.  
Note: Bits 15-0 in this register are programmable  
through the EEPROM.  
4
XMTE  
Transmit Status Enable. When  
this bit is set, a value of 1 is  
passed to the LEDOUT bit in this  
register when there is transmit  
activity on the network.  
Bit  
Name  
Description  
31-16 RES  
Reserved locations. Written as  
zeros and read as undefined.  
This bit is always read/write ac-  
cessible. XMTE is cleared by  
H_RESET and is not affected by  
S_RESET or setting the STOP  
bit.  
15  
LEDOUT  
This bit indicates the current  
(non-stretched) value of the LED  
output pin. A value of 1 in this bit  
indicates that the OR of the en-  
abled signals is true.  
3
2
POWER  
RCVE  
Power. When this bit is set to 1,  
the device is operating in HIGH  
power mode.  
The logical value of the LEDOUT  
status signal is determined by the  
settings of the individual Status  
Enable bits of the LED register  
(bits 8 and 6-0).  
Receive Status Enable. When  
this bit is set, a value of 1 is  
passed to the LEDOUT bit in this  
register when there is receive ac-  
tivity on the network.  
This bit is always read accessi-  
ble. This bit is read only; writes  
have no effect. LEDOUT is unaf-  
fected by H_RESET, S_RESET,  
or STOP.  
This bit is always read/write ac-  
cessible. RCVE is cleared by  
H_RESET and is not affected by  
S_RESET or setting the STOP  
bit.  
14  
LEDPOL  
LED Polarity. When this bit has  
the value 0, then the LED pin will  
be driven to a LOW level whenev-  
er the OR of the enabled signals  
is true, and the LED pin will be  
disabled and allowed to float high  
whenever the OR of the enabled  
signals is false (i.e., the LED out-  
put will be an Open Drain output  
and the output value will be the  
inverse of the LEDOUT status  
bit).  
1
0
SPEED  
COLE  
Speed. When this bit is set to 1,  
the device is operating in HIGH  
speed mode.  
Collision Status Enable. When  
this bit is set, a value of 1 is  
passed to the LEDOUT bit in this  
register when there is collision  
activity on the network.  
Am79C978  
149