Capsim Block Documentation
This star simulates an Ethernet media access unit (MAU or transceiver)
| Port | Type | Name | |
|---|---|---|---|
| 0 | float | in0 | |
| 1 | float | in1 | |
| 2 | float | tx |
| Port | Type | Name | |
|---|---|---|---|
| 0 | float | out0 | |
| 1 | float | out1 | |
| 2 | float | rx | |
| 3 | float | cd |
| Num | Description | Type | Name | Default Value | |
|---|---|---|---|---|---|
| 0 | The width of a bit in samples | int | bitTime | 8 |
| Num | Type | Name | Initial Value | Description |
|---|---|---|---|---|
| 0 | float | tone | ||
| 1 | float | cd0 | ||
| 2 | float | cd1 | ||
| 3 | float | rx0 | ||
| 4 | float | rx1 | ||
| 5 | int | halfBit | ||
| 6 | int | cdCount | ||
| 7 | float | cdPole | ||
| 8 | float | rxPole | ||
| 9 | int | collision |
int i; int numberSamples; float z; double fabs(); float txData; |
|---|
collision=0; tone=1.0; cd0=0.0; cd1=0.0; cdCount=0; halfBit= bitTime >> 1; cdPole= 1.0/(8.0*bitTime); rxPole= 1.0/(3.0*bitTime); |
|---|
for(numberSamples = MIN_AVAIL(); numberSamples > 0; -- numberSamples) {
IT_IN(0);
IT_IN(1);
IT_IN(2);
if(IT_OUT(0)) {
KrnOverflow("mau",0);
return(99);
}
if(IT_OUT(1) ) {
KrnOverflow("mau",1);
return(99);
}
if(IT_OUT(2) ) {
KrnOverflow("mau",2);
return(99);
}
if(IT_OUT(3)) {
KrnOverflow("mau",3);
return(99);
}
/*
* find dc levels on both sides
*/
rx0= (rxPole * in0(0)) + (1.0-rxPole)*rx0;
rx1= (rxPole * in1(0)) + (1.0-rxPole)*rx1;
/*
* output received network data
*/
z=tx(0) +(in0(0) - rx0) + (in1(0) - rx1);
if(z > SQUELCH)
rx(0) = PEAK;
else if (z < -1.0 * SQUELCH)
rx(0) = -1.0* PEAK;
else
rx(0) = 0.0;
if(tx(0) > SQUELCH)
txData = DC_BIAS + PEAK;
else if ( tx(0) < ( -1.0 * SQUELCH))
txData = DC_BIAS - PEAK;
else
txData = 0.0;
/*
* Transmit data on medium out side 0
*/
z= in1(0) + txData;
if( z < LOW_LIMIT)
out0(0) = LOW_LIMIT;
else if(z > HI_LIMIT)
out0(0) = HI_LIMIT;
else
out0(0)=z;
/*
* transmit data on medium out side 1
*/
z= in0(0) + txData;
if( z < LOW_LIMIT)
out1(0) = LOW_LIMIT;
else if (z > HI_LIMIT)
out1(0) = HI_LIMIT;
else
out1(0)=z;
/*
* output collision tone
*/
cd0 = (cdPole* out0(0)) + (1.0-cdPole) * cd0;
cd1 = (cdPole* out1(0)) + (1.0-cdPole) * cd1;
if(( cd0 < CD_THRESHOLD ) || ( cd1 < CD_THRESHOLD))
collision =1;
else
collision = 0;
if( collision || ( cdCount > 0)) {
if(cdCount <=0)
cdCount = bitTime;
if(cdCount > halfBit)
cd(0) = PEAK;
else
cd(0) = -1.0 * PEAK;
--cdCount;
}
else
cd(0) = 0.0;
}
return(0);
|
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/* Capsim (r) Text Mode Kernel (TMK) Star Library (Blocks)
Copyright (C) 1989-2017 Silicon DSP Corporation
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
http://www.silicondsp.com
Silicon DSP Corporation
Las Vegas, Nevada
*/
|
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/*mau.s*/ /* * Inputs: in0: The data from one direction * in1: The data from the other direction * tx: The data to be transmitted * Outputs: out0: Transmit data in one direction * out1: The transmit data in the other direction * rx: The received data * cd: The Collision detect signal * * Parameters: bitTime: The width of a bit in samples * * This star simulates an Ethernet media access unit (MAU or transceiver) * * |
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