T13/1532D Volume 3 Revision 0 2.3.1 40-pin Connector The l/O connector is a 40-pin connector.The header mounted to a host or device is shown in Figure 3 and the dimensions are shown in Table 6.The connector mounted to the end of the cable is shown in Figure 4 and the dimensions are shown in Table 7.Signal assignments on these connectors are shown in Table 8. The pin locations are governed by the cable plug,not the receptacle.The way in which the receptacle is mounted on the printed circuit board affects the pin positions,and pin 1 shall remain in the same relative position.This means the pin numbers of the receptacle may not reflect the conductor number of the plug.The header receptacle may or may not be polarized,and all the signals are relative to pin 20,which is keyed. By using the plug positions as primary,a straight cable can connect devices.As shown in Figure 5,conductor 1 on pin 1 of the plug shall be in the same relative position no matter what the receptacle numbering looks like. If receptacle numbering was followed,the cable would have to twist 180 degrees between a device with top- mounted receptacles,and a device with bottom-mounted receptacles. Page 9T13/1532D Volume 3 Revision 0 Page 9 2.3.1 40-pin Connector The I/O connector is a 40-pin connector. The header mounted to a host or device is shown in Figure 3 and the dimensions are shown in Table 6. The connector mounted to the end of the cable is shown in Figure 4 and the dimensions are shown in Table 7. Signal assignments on these connectors are shown in Table 8. The pin locations are governed by the cable plug, not the receptacle. The way in which the receptacle is mounted on the printed circuit board affects the pin positions, and pin 1 shall remain in the same relative position. This means the pin numbers of the receptacle may not reflect the conductor number of the plug. The header receptacle may or may not be polarized, and all the signals are relative to pin 20, which is keyed. By using the plug positions as primary, a straight cable can connect devices. As shown in Figure 5, conductor 1 on pin 1 of the plug shall be in the same relative position no matter what the receptacle numbering looks like. If receptacle numbering was followed, the cable would have to twist 180 degrees between a device with top￾mounted receptacles, and a device with bottom-mounted receptacles