Datasheet
DP83640
www.ti.com
SNOSAY8E –SEPTEMBER 2007–REVISED APRIL 2013
10.2.5 LED Direct Control Register (LEDCR)
This register provides the ability to directly control any or all LED outputs. It does not provide read access
to LEDs. In addition, it provides control for the Activity source and blinking LED frequency.
Table 10-20. LED Direct Control Register (LEDCR), address 0x18
Bit Bit Name Default Description
15:1 RESERVED 0000, RO RESERVED: Writes ignored, read as 0.
2
11 DIS_SPDLED 0, RW 1 = Disable LED_SPEED output
0 = Enable LED_SPEED output
10 DIS_LNKLED 0, RW 1 = Disable LED_LINK output
0 = Enable LED_LINK output
9 DIS_ACTLED 0, RW 1 = Disable LED_ACT output
0 = Enable LED_ACT output
8 LEDACT_RX 0, RW 1 = Activity is only indicated for Receive traffic
0 = Activity is indicated for Transmit or Receive traffic
7:6 BLINK_FREQ 00, RW LED Blink Frequency:
These bits control the blink frequency of the LED_LINK output when blinking on
activity is enabled.
0 = 6 Hz
1 = 12 Hz
2 = 24 Hz
3 = 48 Hz
5 DRV_SPDLED 0, RW 1 = Drive value of SPDLED bit onto LED_SPEED output
0 = Normal operation
4 DRV_LNKLED 0, RW 1 = Drive value of LNKLED bit onto LED_LINK output
0 = Normal operation
3 DRV_ACTLED 0, RW 1 = Drive value of ACTLED bit onto LED_ACT output
0 = Normal operation
2 SPDLED 0, RW Value to force on LED_SPEED output
1 LNKLED 0, RW Value to force on LED_LINK output
0 ACTLED 0, RW Value to force on LED_ACT output
10.2.6 PHY Control Register (PHYCR)
This register provides control for PHY functions such as MDIX, BIST, LED configuration, and PHY
address. It also provides Pause Negotiation status.
Table 10-21. PHY Control Register (PHYCR), address 0x19
Bit Bit Name Default Description
15 MDIX_EN 1, RW Auto-MDIX Enable:
1 = Enable Auto-neg Auto-MDIX capability.
0 = Disable Auto-neg Auto-MDIX capability.
14 FORCE_MDIX 0, RW Force MDIX:
1 = Force MDI pairs to cross.
(Receive on TD pair, Transmit on RD pair)
0 = Normal operation.
Copyright © 2007–2013, Texas Instruments Incorporated Register Block 97
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