SNLS579A April 2018 – November 2018 DP83TC811S-Q1
PRODUCTION DATA.
The DP83TC811S-Q1 also supports Reduced Gigabit Media Independent Interface (RGMII) as specified by RGMII version 2.0 with LVCMOS. RGMII is designed to reduce the number of pins required to connect MAC and PHY. To accomplish this goal, the control signals are multiplexed. Both rising and falling edges of the clock are used to sample the control signal pin on transmit and receive paths. Data is samples on just the rising edge of the clock. For 100-Mbps operation, RX_CLK and TX_CLK operate at 25 MHz.
The RGMII signals are summarized in Table 12:
FUNCTION | PINS |
---|---|
Data Signals | TX_D[3:0] |
RX_D[3:0] | |
Control Signals | TX_CTRL |
RX_CTRL | |
Clock Signals | TX_CLK |
RX_CLK |
TX_CTRL
(POSITIVE EDGE) |
TX_CTRL
(NEGATIVE EDGE) |
TX_D[3:0] | DESCRIPTION |
---|---|---|---|
0 | 0 | 0000 through 1111 | Normal Inter-Frame |
0 | 1 | 0000 through 1111 | Reserved |
1 | 0 | 0000 through 1111 | Normal Data Transmission |
1 | 1 | 0000 through 1111 | Transmit Error Propagation |
RX_CTRL
(POSITIVE EDGE) |
RX_CTRL
(NEGATIVE EDGE) |
RX_D[3:0] | DESCRIPTION |
---|---|---|---|
0 | 0 | 0000 through 1111 | Normal Inter-Frame |
0 | 1 | 0000 through 1101 | Reserved |
0 | 1 | 1110 | False Carrier Indication |
0 | 1 | 1111 | Reserved |
1 | 0 | 0000 through 1111 | Normal Data Reception |
1 | 1 | 0000 through 1111 | Data Reception with Errors |
During packet reception, RX_CLK may be stretched on either the positive or negative pulse to accommodate the transition from the internal free running clock to a recovered clock (data synchronous). Data may be duplicated on the falling edge of the clock because double data rate (DDR) is only required for 1-Gbps operation, which is not supported by the DP83TC811S-Q1.
The DP83TC811S-Q1 supports in-band status indication to help simplify link status detection. Inter-frame signals on RX_D[3:0] pins as specified in Table 15.
RX_CTRL | RX_D3 | RX_D[2:1] | RX_D0 |
---|---|---|---|
00
Note: In-band status is only valid when RX_CTRL is low |
Duplex Status:
0 = Half-Duplex 1 = Full-Duplex |
RX_CLK Clock Speed:
00 = 2.5 MHz 01 = 25 MHz 10 = 125 MHz 11 = Reserved |
Link Status:
0 = Link not established 1 = Valid link established |