cp2200 Silicon Laboratories, cp2200 Datasheet - Page 90

• Manufacturer Part Number: cp2200
• Description: Single-chip Ethernet Controller
• Manufacturer: Silicon Laboratories

CP2200/1
15.7. Initializing the Physical Layer
The physical layer should be configured to the desired mode prior to setting the enable bit PHYEN (PHYCN.7). The
following procedure should be used to initialize the physical layer:
Note: Step 6 and Step 7 are repeated in the reset initialization procedure. Software only needs to perform these steps once.
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Step 1: If auto-negotiation is used, implement the synchronization procedure in Section 15.2 on page 88.
Step 2: Disable the physical layer by writing 0x00 to the PHYCN register.
Step 3: Configure Desired Options using the PHYCN and PHYCF registers:
Step 4: Enable the physical layer:
Step 5: Wait for auto-negotiation to complete. If auto-negotiation is not enabled, software may wait for a valid
Step 6: Enable the desired Activity, Link, or Activity/Link LEDs using the Register 15, “IOPWR: Port Input/
Step 7: Initialize the MAC to the same duplex mode reported by the physical layer in the PHYCN register.
1.Specify the Duplex Mode or enable Auto-Negotiation.
2.Enable or Disable Loopback Mode.
3.Disable the transmitter power save mode (TXPWR = 0x80).
4.Enable the desired functions such as Receiver Smart Squelch, Automatic Polarity Correction, Link
5.If Automatic Polarity Correction is disabled, manually set the desired polarity.
1.Enable the physical layer (PHYEN = 1).
2.Wait for the physical layer to power up. See Physical Layer Startup Time in Table 22 on page 93.
3.Enable the transmitter and receiver (TXEN = 1 and RXEN = 1).
link or go directly to MAC Initialization.
Output Power Register,” on page 45.
Integrity, Jabber Protection, and PAUSE packet capability advertisement.
Rev. 1.0