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Digital control board documentation (view source)
Revision as of 19:21, 16 June 2009
, 19:21, 16 June 2009→Ethernet Jack: added pin info
=== Ethernet Jack ===
=== Ethernet Jack ===
To the right of the CP2201 is a Pulse J0011D21NL ethernet jack, labelled J1. This jack has a built-in 1:1 inductive coupling. For best results, connect this jack to a nearby ethernet switch. The jack may also be connected directly to a computer using a crossover cable. Though auto-crossover is not supported by the CP2201, if the computer's NIC supports it, a crossover cable is not necessary to connect directly to a computer.
To the right of the CP2201 is a Pulse J0011D21NL ethernet jack, labelled J1. This jack has a built-in 1:1 inductive coupling. For best results, connect this jack to a nearby ethernet switch. The jack may also be connected directly to a computer using a crossover cable. Though auto-crossover is not supported by the CP2201, if the computer's NIC supports it, a crossover cable is not necessary to connect directly to a computer.
==== Ethernet Jack Pins ====
These are visible only on the back side of the board. Pin 1 is indicated by a square pad. Pin 8 is the farthest pin from pin 1. Pins numbered such that the 4 pins closer to the plastic thru-hole connectors are odd (1, 3, 5, 7), and the four pins closer to the CP2201 are are even.
* Pin 1: TX+
* Pin 2: AC coupled to DGND
* Pin 3: TX-
* Pin 4: RX+
* Pin 5: AC coupled to DGND
* Pin 6: RX-
* Pin 7: No connection
* Pin 8: DGND (direct)
The two large thru-hole pins (not numbered) connect to the metal shielding on the outside of the jack. These are directly connected to DGND to shield against electrical noise inside the jack.
The two plastic thru-hole pins are not conductive and have no electrical connection. They are present only for structural purposes, presumably to prevent stress of the solder points when an ethernet wire is inserted or removed from the jack.
=== Crystal Oscillator ===
=== Crystal Oscillator ===