DRA790 Datasheet, PDF (261/436 Pages) Texas Instruments – Infotainment Applications Processor

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DRA790, DRA791
DRA793, DRA797
SPRS968A – AUGUST 2016 – REVISED FEBRUARY 2017
NO.
RMII5
RMII6
Table 5-97. Timing Requirements for GMAC RMIIn Receive
PARAMETER
t_{su(RXD-REF_CLK)}
t_{su(CRS_DV-REF_CLK)}
t_{su(RX_ER-REF_CLK)}
t_{h(REF_CLK-RXD)}
t_{h(REF_CLK-CRS_DV)}
t_{h(REF_CLK-RX_ER)}
DESCRIPTION
Setup time, receive selected signals valid before REF_CLK
Hold time, receive selected signals valid after REF_CLK
MIN
4
2
MAX
UNIT
ns
ns
REF_CLK (PRCM)
RMII4
RMII3
RMII1
RMII2
RMII5
RMII6
rmiin_rxd1−rmiin_rxd0,
rmiin_crs, rmin_rxer (inputs)
Figure 5-70. GMAC Receive Interface Timing RMIIn operation
SPRS906_TIMING_GMAC_RGMIITX_09
Table 5-98, Table 5-98 and Figure 5-71 present switching characteristics for GMAC RMIIn Transmit
10/100Mbit/s.
Table 5-98. Switching Characteristics Over Recommended Operating Conditions for GMAC REF_CLK -
RMII Operation
NO.
RMII7
RMII8
RMII9
RMII10
PARAMETER
t_{c(REF_CLK)}
t_{w(REF_CLKH)}
t_{w(REF_CLKL)}
t_{t(REF_CLK)}
DESCRIPTION
Cycle time, REF_CLK
Pulse duration, REF_CLK high
Pulse duration, REF_CLK low
Transistion time, REF_CLK
MIN
MAX UNIT
20
ns
7
13
ns
7
13
ns
3
ns
Table 5-99. 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 5-71. GMAC Transmit Interface Timing RMIIn Operation
SPRS906_TIMING_GMAC_RMIITX_07
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Specifications 261