AM5718_16 Datasheet, PDF (298/394 Pages) Texas Instruments – Sitara Processors Silicon Revision 2.0

AM5718, AM5716
SPRS957C – MARCH 2016 – REVISED NOVEMBER 2016
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Table 7-82. Switching Characteristics for GMAC RGMIIn Output Transmit for 10/100/1000 Mbps
(1) _(continued)
NO. PARAMETER DESCRIPTION
MODE
MIN MAX UNIT
6
t_oh(TXC-TXD)
Output Hold time, transmit selected signals valid after
RGMII0, Internal Delay
1.05
ns
rgmiin_txc high/low
Enabled, 1000 Mbps
(2)
RGMII0, Internal Delay
1.2
ns
Enabled, 10/100 Mbps
RGMII1, Internal Delay
1.05
ns
Enabled, 1000 Mbps
(3)
RGMII1, Internal Delay
1.2
ns
Enabled, 10/100 Mbps
(1) For RGMII, transmit selected signals include: rgmiin_txd[3:0] and rgmiin_txctl.
(2) RGMII0 requires that the 4 data pins rgmii0_txd[3:0] and rgmii0_txctl have their board propagation delays matched within 50pS of
rgmii0_txc.
(3) RGMII1 requires that the 4 data pins rgmii1_txd[3:0] and rgmii1_txctl have their board propagation delays matched within 50pS of
rgmii1_txc.
rgmiin_txc^(A)
[internal delay enabled]
rgmiin_txd[3:0]^(B)
rgmiin_txctl^(B)
1
4
2
3
4
1st Half-byte
2nd Half-byte
TXEN
TXERR
5
6
SPRS906 TIMING GMAC RGMIITX 09
A. TXC is delayed internally before being driven to the rgmiin_txc pin. This internal delay is always enabled.
B. Data and control information is transmitted using both edges of the clocks. rgmiin_txd[3:0] carries data bits 3-0 on the
rising edge of rgmiin_txc and data bits 7-4 on the falling edge of rgmiin_txc. Similarly, rgmiin_txctl carries TXEN on
rising edge of rgmiin_txc and TXERR of falling edge of rgmiin_txc.
Figure 7-60. GMAC Transmit Interface Timing RGMIIn operation
In Table 7-83 are presented the specific groupings of signals (IOSET) for use with GMAC RGMII signals.
SIGNALS
rgmii1_txd3
rgmii1_txd2
rgmii1_txd1
rgmii1_txd0
rgmii1_rxd3
rgmii1_rxd2
rgmii1_rxd1
rgmii1_rxd0
rgmii1_rxctl
rgmii1_txc
rgmii1_txctl
rgmii1_rxc
rgmii0_txd3
Table 7-83. GMAC RGMII IOSETs
BALL
C3
C4
B2
D6
B3
B4
B5
A4
A3
D5
C2
C5
IOSET3
MUX
3
3
3
3
3
3
3
3
3
3
3
3
BALL
IOSET4
MUX
V7
0
298 Timing Requirements and Switching Characteristics
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