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Changes for page Front I/O

Last modified by Kevin Wiki on 2024/07/07 22:48
From version 6.1
edited by Kevin Wiki
on 2024/07/05 09:25
Change comment: Deleted image "xserve io main cable pinout.drawio.png"
To version 2.1
edited by Kevin Wiki
on 2024/07/04 16:49
Change comment: There is no comment for this version

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6 6  
7 7  There is a single cable that controls four parts, each half side of I/O LED and center column of blue LEDs.
8 8  
9 -[[image:xserve io main cable and PCB pinout.drawio.png||alt="xserve io main cable pinout.drawio.png"]]
9 +== Sub-paragraph ==
10 10  
11 -(% class="wikigeneratedid" %)
12 -[[attach:xserve io main cable pinout.drawio.svg||target="_blank"]]
11 +Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
13 13  
13 +== Sub-paragraph ==
14 14  
15 -(% class="wikigeneratedid" %)
16 -This cable allows us to communicate with 4 chips using two data lines, audio & service switch, case switch and (yet to be documented) compute LEDs
15 +Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
17 17  
17 +=== Sub-sub paragraph ===
18 +
19 +Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
20 +
21 +
18 18  = How we got here =
19 19  
20 20  Measure out the ground and power signals by comparing with other chips on board. E.g. we find [SAA1064T] datasheet, locate the GND (Vee) and 5V (Vcc) and measure connectivity (0 ohm resistance) between chip pins and cable pins. This gives us pins GND 2 & 8 and PWR 16 & 22.
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146 146  {
147 147  }
148 148  {{/code}}
149 -
150 -== SAA1064T data for driving center IO LED stack ==
151 -
152 -Center IO stack is a stack of 23 LED's, 22 blue and 1 green for ethernet activity. These are duplicated next to each other and driven by each their SAA1064T chips. Earlier we found the i2c address and just by playing around figured out that 4 segments of 1 byte binary values are used to set ship register.
153 -
154 -{{code language="C++"}}
155 -void fillColumns() {
156 - Serial.println("filling columns");
157 - Wire.beginTransmission(saa1064);
158 - Wire.write(1);
159 - Wire.write(0x7F); // 127 - 1111111
160 - Wire.write(0x7F); // 127 - 1111111
161 - Wire.write(0x7F); // 127 - 1111111
162 - Wire.write(0x1F); // 31 - 11111
163 - Wire.endTransmission();
164 -
165 - colsFilled = 1;
166 -}
167 -{{/code}}
168 -
169 -(% class="wikigeneratedid" %)
170 -Here the last byte we send only is 5 bits since we only have 5 LEDs instead of 6 to address (total of 23). Also note that we start the transmission with a single bit.
171 -
172 -== Pinouts voltages from MLB ==
173 -
174 -Powered off:
175 -
176 -* PWR fail LED - 0.00 V
177 -* UID LED - 4.5V
178 -* OH/Fan fail LED - 4.72 V
179 -* NIC1 LED - 0.8 - 2.6 V
180 -* NIC2 LED - 2.95 V
181 -* UID SW - 2.8V
182 -* HDD LED - 0.00 V
183 -* Power LED P3V3 - 0.00V
184 -* Power LED - 0.00 V after unplug grows
185 -
186 -Powered on:
187 -
188 -* PWR tail LED - 3.47 V
189 -* UID LED - 4.85V
190 -* OH/Fan failed LED - 5 V
191 -* NIC 1 LED - 1.2 - 2.9 V
192 -* NIC 2 LED - 3.2 V
193 -* UID SW - 3V
194 -* HDD LED - 3 V
195 -* Power LED P3V3 - 3.30V
196 -* Power LED - 0.87 V
197 -
198 -
199 199  )))
200 200  
201 201  
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210 210  
211 211  [[image:[email protected]]]
212 212  //Figure 2: [[Waves>>https://commons.wikimedia.org/wiki/File:Culebra_-_Playa_de_Flamenco.jpg]]//
213 -
214 -
215 -
216 -
217 -
218 -
219 -
220 220  )))
221 221  )))
xserve io main cable and PCB pinout.drawio.png
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