RM57L843 Datasheet, PDF (202/218 Pages) Texas Instruments – Microcontroller Based on the ARM

RM57L843
SPNS215B – FEBRUARY 2014 – REVISED JANUARY 2016
7.12.2 Ethernet RMII Timing
1
2
3
RMII_REFCLK
5
5
RMII_TXEN
4
RMII_TXD[1:0]
RMII_RXD[1:0]
6
7
8
9
10
RMII_CRS_DV
RMII_RX_ER
11
Figure 7-28. RMII Timing Diagram
NO.
1
tc(REFCLK)
2
tw(REFCLKH)
3
tw(REFCLKL)
6
tsu(RXD-REFCLK)
7
th(REFCLK-RXD)
8
tsu(CRSDV-REFCLK)
9
th(REFCLK-CRSDV)
10 tsu(RXER-REFCLK)
11 th(REFCLK-RXER)
4
td(REFCLK-TXD)
5
td(REFCLK-TXEN)
Table 7-41. RMII Timing Requirements
Parameter
MIN
Cycle time, RMII_REF_CLK
-
Pulse width, RMII_REF_CLK High
7
Pulse width, RMII_REF_CLK Low
7
Input setup time, RMII_RXD valid before
4
RMII_REF_CLK High
Input hold time, RMII_RXD valid after
2
RMII_REF_CLK High
Input setup time, RMII_CRSDV valid before
4
RMII_REF_CLK High
Input hold time, RMII_CRSDV valid after
2
RMII_REF_CLK High
Input setup time, RMII_RXER valid before
4
RMII_REF_CLK High
Input hold time, RMII_RXER valid after
2
RMII_REF_CLK High
Output delay time, RMII_REF_CLK High to
2
RMII_TXD valid
Output delay time, RMII_REF_CLK High to
2
RMII_TX_EN valid
Value
NOM
20
-
-
-
-
-
-
-
-
-
-
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Unit
MAX
-
ns
13
ns
13
ns
-
ns
-
ns
-
ns
-
ns
-
ns
-
ns
16
ns
16
ns
202 Peripheral Information and Electrical Specifications
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