dp83630sqx National Semiconductor Corporation, dp83630sqx Datasheet - Page 63

• Manufacturer Part Number: dp83630sqx
• Description: Precision Phyter - Ieee 1588 Precision Time Protocol Transceiver
• Manufacturer: National Semiconductor Corporation

15:12
Bit
1:0
Bit
7:6
11
10
2
14.2.5 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.
9
8
5
4
3
2
1
0
ELAST_BUF[1:0]
DRV_SPDLED
DRV_LNKLED
DRV_ACTLED
RX_UNF_STS
DIS_SPDLED
DIS_LNKLED
DIS_ACTLED
BLINK_FREQ
LEDACT_RX
RESERVED
Bit Name
Bit Name
SPDLED
LNKLED
ACTLED
TABLE 31. LED Direct Control Register (LEDCR), address 0x18
0000, RO
Default
01, RW
Default
00, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RW
0, RO
RX FIFO Under Flow Status:
0 = Normal.
1 = Underflow detected.
Receive Elasticity Buffer:
This field controls the Receive Elasticity Buffer which allows for frequency
variation tolerance between the 50 MHz RMII clock and the recovered data. See
Section 10.2 REDUCED MII
settings in RMII mode. See Section
more information on Elasticity Buffer settings in SCMII mode.
RESERVED: Writes ignored, read as 0.
1 = Disable LED_SPEED output
0 = Enable LED_SPEED output
1 = Disable LED_LINK output
0 = Enable LED_LINK output
1 = Disable LED_ACT output
0 = Enable LED_ACT output
1 = Activity is only indicated for Receive traffic
0 = Activity is indicated for Transmit or Receive traffic
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
1 = Drive value of SPDLED bit onto LED_SPEED output
0 = Normal operation
1 = Drive value of LNKLED bit onto LED_LINK output
0 = Normal operation
1 = Drive value of ACTLED bit onto LED_ACT output
0 = Normal operation
Value to force on LED_SPEED output
Value to force on LED_LINK output
Value to force on LED_ACT output
63
INTERFACEfor more information on Elasticity Buffer
Description
Description
Section 10.3 SINGLE CLOCK MII
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MODEfor