RGMII[x]_TCLK
(A)
RGMII[x]_TD[3:0]
(B)
RGMII[x]_TCTL
(B)
1
1st Half-byte
TXERR
TXEN
2nd Half-byte
1
2
RGMII[x]_TCLK
4
4
2
3
1
AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H – OCTOBER 2011 – REVISED MAY 2015
Table 7-18. Switching Characteristics for RGMII[x]_TCLK - RGMII Mode
(see
10 Mbps
100 Mbps
1000 Mbps
NO.
PARAMETER
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
1
t
c(TXC)
Cycle time, TXC
360
440
36
44
7.2
8.8
ns
Pulse duration, TXC
2
t
w(TXCH)
160
240
16
24
3.6
4.4
ns
high
3
t
w(TXCL)
Pulse duration, TXC low
160
240
16
24
3.6
4.4
ns
4
t
t(TXC)
Transition time, TXC
0.75
0.75
0.75
ns
Figure 7-15. RGMII[x]_TCLK Timing - RGMII Mode
Table 7-19. Switching Characteristics for RGMII[x]_TD[3:0], and RGMII[x]_TCTL - RGMII Mode
(see
10 Mbps
100 Mbps
1000 Mbps
NO.
PARAMETER
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
t
sk(TD-TXC)
TD to TXC output skew
–0.5
0.5
–0.5
0.5
–0.5
0.5
1
ns
t
sk(TX_CTL-TXC)
TX_CTL to TXC output skew
–0.5
0.5
–0.5
0.5
–0.5
0.5
t
t(TD)
Transition time, TD
0.75
0.75
0.75
2
ns
t
t(TX_CTL)
Transition time, TX_CTL
0.75
0.75
0.75
A.
The EMAC and switch implemented in the AM335x device supports internal delay mode, but timing closure was not
performed for this mode of operation. Therefore, the AM335x device does not support internal delay mode.
B.
Data and control information is transmitted using both edges of the clocks. RGMII[x]_TD[3:0] carries data bits 3-0 on
the rising edge of RGMII[x]_TCLK and data bits 7-4 on the falling edge of RGMII[x]_TCLK. Similarly, RGMII[x]_TCTL
carries TXEN on rising edge of RGMII[x]_TCLK and TXERR of falling edge of RGMII[x]_TCLK.
Figure 7-16. RGMII[x]_TD[3:0], RGMII[x]_TCTL Timing - RGMII Mode
126
Peripheral Information and Timings
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