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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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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 read accessible al-  
ways. 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 set to 1 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.  
When this bit has the value 1,  
then the LED pin will be driven to  
a HIGH level whenever the OR of  
the enabled signals is true, and  
the LED pin will be driven to a  
LOW level whenever the OR of  
the enabled signals is false (i.e.,  
the LED output will be a Totem  
Pole output and the output value  
will be the same polarity as the  
LEDOUT status 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.  
BCR7: LED3 Status  
BCR7 controls the function(s) that the LED3 pin dis-  
plays. Multiple functions can be simultaneously enabled  
on this LED pin. The LED display will indicate the logical  
OR of the enabled functions. BCR7 defaults to Transmit  
Status (XMT) with pulse stretcher enabled (PSE = 1)  
and is fully programmable.  
The setting of this bit will not ef-  
fect the polarity of the LEDOUT  
bit for this register.  
Note: When LEDPE (BCR2, bit 12) is set to 1, pro-  
gramming of the LED3 Status register is enabled.  
When LEDPE is cleared to 0, programming of the  
LED3 register is disabled. Writes to those registers will  
be ignored.  
This bit is always read/write ac-  
cessible. LEDPOL is cleared by  
H_RESET and is not affected by  
S_RESET or setting the STOP  
bit.  
Note: Bits 15-0 in this register are programmable  
through the EEPROM.  
13  
LEDDIS  
LED Disable. This bit is used to  
disable the LED output. When  
LEDDIS has the value 1, then the  
LED output will always be dis-  
abled. When LEDDIS has the val-  
ue 0, then the LED output value  
Bit  
Name  
Description  
31-16 RES  
Reserved locations. Written as  
zeros and read as undefined.  
Am79C978  
153