DRA722_17 Datasheet, PDF (291/408 Pages) Texas Instruments – Infotainment Applications Processor

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DRA722, DRA724, DRA725, DRA726
SPRS956B – MARCH 2016 – REVISED JANUARY 2017
CAUTION
The I/O Timings provided in this section are valid only for some GMAC usage
modes when the corresponding Virtual I/O Timings or Manual I/O Timings are
configured as described in the tables found in this section.
Table 7-76, Table 7-77 and Figure 7-58 present timing requirements for GMAC RMIIn Receive.
Table 7-76. Timing Requirements for GMAC REF_CLK - RMII Operation
NO.
PARAMETER
RMII1
RMII2
RMII3
RMII4
t_{c(REF_CLK)}
t_{w(REF_CLKH)}
t_{w(REF_CLKL)}
t_{tt(REF_CLK)}
DESCRIPTION
Cycle time, REF_CLK
Pulse duration, REF_CLK high
Pulse duration, REF_CLK low
Transistion time, REF_CLK
MIN
MAX
20
7
13
7
13
3
NO.
RMII5
RMII6
Table 7-77. 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
ns
ns
UNIT
ns
ns
REF_CLK (PRCM)
RMII4
RMII3
RMII1
RMII2
RMII5
RMII6
rmiin_rxd1−rmiin_rxd0,
rmiin_crs, rmin_rxer (inputs)
Figure 7-58. GMAC Receive Interface Timing RMIIn operation
SPRS906_TIMING_GMAC_RGMIITX_09
Table 7-78, Table 7-78 and Figure 7-59 present switching characteristics for GMAC RMIIn Transmit
10/100Mbit/s.
Table 7-78. 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
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Timing Requirements and Switching Characteristics 291
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