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MU9C8338 参数 Datasheet PDF下载

MU9C8338图片预览
型号: MU9C8338
PDF下载: 下载PDF文件 查看货源
内容描述: 10 / 100Mb的以太网接口筛选 [10/ 100Mb Ethernet Filter Interface]
分类和应用: 以太网
文件页数/大小: 28 页 / 428 K
品牌: MUSIC [ MUSIC SEMICONDUCTORS ]
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MU9C8338 10/100Mb Ethernet Filter Interface  
Pin Descriptions  
/FI (LANCAM Bus Full Flag, Input, TTL)  
LANCAM Interface  
The /FI LANCAM Full flag input is used to indicate to the  
MU9C8338 the condition of the LANCAM Full flag. The  
/FF output from the LANCAM should be connected to this  
pin. If more than one LANCAM is used, /FI should be  
connected to the /FF of the last device in the daisy chain.  
See Timing Diagrams: Timing Data for LANCAM  
Interface.  
DQ[15:0] (LANCAM Bus, Input/Output, Tri-state, TTL)  
DQ[15: 0] tri-state 16- bit bus transfers data or instructions  
between the MU9C8338 and the LANCAM. When no  
data or instructions are present on the bus, the bus goes  
HIGH-Z.  
/RESET_LC (Reset LANCAM, Output, TTL)  
/RESET_LC is LOW whenever /RESET is LOW. It is  
taken HIGH only by writing to bit 0 in the System  
Dynamic Configuration (SDCFG) register. See SDCFG  
register information.  
/E (LANCAM Bus Enable, Output, Tri-state, TTL)  
The /E chip enable is taken LOW to initiate LANCAM  
activity. On LANCAM read cycles, /E is taken HIGH after  
the MU9C8338 registers the data.  
Test  
SC_ENB (Scan Enable)  
/W (LANCAM Bus Write, Output, Tri-state, TTL)  
Enables scan chain for testing. Pin may be left  
unconnected or tied to GND for normal operation  
The MU9C8338 outputs /W (read/write select) to control  
the direction of data flow between the MU9C8338 and the  
LANCAM. If /W is LOW at the falling edge of /E, the  
MU9C8338 outputs data on the DQ[15:0] bus for the  
LANCAM as input. When /W is HIGH at the falling edge  
of /E, the LANCAM outputs data on the DQ[15:0] bus to  
the MU9C8338 as input.  
TST_HLD, TST_HLD2 (Test Hold)  
Enables test mechanism. Pins may be left unconnected or  
tied to GND for normal operation.  
JTAG  
Note: Please refer to IEEE Standard 1149.1 for information on  
using the mandatory JTAG functions. The optional HIGH-Z  
function is implemented and may be activated by writing 0011 to  
the JTAG Instruction register.  
/CM (LANCAM Bus Command Mode, Output, Tri-state,  
TTL)  
The MU9C8338 outputs /CM Data/Command Select to  
control whether the LANCAM interprets the DQ[15:0]  
bus contents as command information or data. If both /CM  
and /W are LOW at the falling edge of /E, the MU9C8338  
outputs an instruction for the LANCAM to execute or a  
value for one of the LANCAM configuration registers. If  
/CM is LOW while /W is HIGH, then the LANCAM will  
output data from one of its configuration registers to the  
MU9C8338. If /CM is HIGH while /W is LOW, the  
MU9C8338 will output data for the LANCAM to place in  
one of its data registers or memory. If /CM is HIGH while  
/W is HIGH, the LANCAM outputs data from one of its  
data registers or memory to the MU9C8338.  
/TRST (JTAG Reset, Input)  
The /TRST is the Test Reset pin. It is internally pulled up  
with a 3k minimum resistor. It must be tied to /RESET or  
tied LOW when the JTAG port is not used.  
TMS (JTAG Test Mode Select, Input)  
The TMS input is the Test Mode Select input. This pin is  
internally pulled up with a 3k minimum resistor.  
TCK (JTAG Test Clock, Input)  
The TCK input is the Test Clock input. It can be tied at a  
valid logic level 1 when not in use. This pin is internally  
pulled up with a 3k minimum resistor.  
/EC (LANCAM Bus Enable Chain, Output, Tri-state,  
TTL)  
TDI (JTAG Test Data Input, Input)  
The Daisy Chain Enable signal performs two functions.  
The /EC signal enables the LANCAMs /MF output to  
show the results of a comparison. If /EC is LOW at the  
falling edge of /E in a cycle, the /MF flag output is  
enabled; otherwise, /MF is held HIGH. The /EC signal  
also enables the /MF-/MI daisy chain that serves to select  
the device with the highest-priority match in a string of  
LANCAMs.  
The TDI input is the Test Data input. This pin is internally  
pulled up with a 3k minimum resistor.  
TDO (JTAG Test Data Output, Output)  
The TDO output is the Test Data output.  
Power and Ground  
VDD, GND (Positive Power Supply, Ground)  
These pins are the power supply connections to the  
MU9C8338. VDD must meet the voltage supply  
requirements in the Operating Conditions section relative  
to the GND pins, which are at 0 Volts (system reference  
potential), for correct operation of the device.  
/MI (LANCAM Bus Match Flag, Input, TTL)  
The /MI LANCAM Match flag input is used to indicate to  
the MU9C8338 the conditions of the LANCAM Match  
flag. The /MF output from the LANCAM should be  
connected to this pin. If more than one LANCAM is used,  
/MI should be connected to the /MF pin of the last  
LANCAM in the daisy chain.  
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Rev. 1a  
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