DRA722_17 Datasheet, PDF (292/408 Pages) Texas Instruments – Infotainment Applications Processor

DRA722, DRA724, DRA725, DRA726
SPRS956B – MARCH 2016 – REVISED JANUARY 2017
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Table 7-79. Switching Characteristics Over Recommended Operating Conditions for GMAC RMIIn
Transmit 10/100 Mbits/s
NO.
RMII11
PARAMETER
t_{d(REF_CLK-TXD)}
t_{dd(REF_CLK-TXEN)}
t_{d(REF_CLK-TXD)}
t_{dd(REF_CLK-TXEN)}
DESCRIPTION
Delay time, REF_CLK high to selected transmit signals
valid
RMIIn
RMII0
RMII1
MIN
MAX UNIT
2
13.5
ns
2
13.8
ns
REF_CLK (PRCM)
RMII7
RMII8
RMII11
RMII9
RMII10
rmiin_txd1−rmiin_txd0,
rmiin_txen (Outputs)
Figure 7-59. GMAC Transmit Interface Timing RMIIn Operation
SPRS906_TIMING_GMAC_RMIITX_07
In Table 7-80 are presented the specific groupings of signals (IOSET) for use with GMAC RMII signals.
SIGNALS
RMII_MHZ_50_CLK
rmii1_txd1
rmii1_txd0
rmii1_rxd1
rmii1_rxd0
rmii1_rxer
rmii1_txen
rmii1_crs
rmii0_txd1
rmii0_txd0
rmii0_rxd1
rmii0_rxd0
rmii0_txen
rmii0_rxer
rmii0_crs
Table 7-80. GMAC RMII IOSETs
BALL
U3
V5
V4
W9
V9
Y1
U5
V2
IOSET1
MUX
0
2
2
2
2
2
2
2
BALL
U3
IOSET2
MUX
0
Y2
1
W2
1
V6
1
U6
1
V3
1
U7
1
V7
1
Manual IO Timings Modes must be used to guaranteed some IO timings for GMAC. See Table 7-2 Modes
Summary for a list of IO timings requiring the use of Manual IO Timings Modes. See Table 7-81 Manual
Functions Mapping for GMAC RMII0 for a definition of the Manual modes.
Table 7-81 lists the A_DELAY and G_DELAY values needed to calculate the correct values to be set in
the CFG_x registers.
292 Timing Requirements and Switching Characteristics
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