AM1808_1004 Datasheet, PDF (194/264 Pages) Texas Instruments – AM1808 ARM Microprocessor

AM1808
SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
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Table 6-102. Timing Requirements for EMAC RMII
NO.
PARAMETER
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(REFCLKR-RXER)
Cycle Time, REF_CLK
Pulse Width, REF_CLK High
Pulse Width, REF_CLK Low
Input Setup Time, RXD Valid before REF_CLK High
Input Hold Time, RXD Valid after REF_CLK High
Input Setup Time, CRSDV Valid before REF_CLK High
Input Hold Time, CRSDV Valid after REF_CLK High
Input Setup Time, RXER Valid before REF_CLK High
Input Hold Time, RXER Valid after REF_CLK High
(1) RMII is not supported at operating points below 1.1V nominal.
1.3V, 1.2V, 1.1V⁽¹⁾
UNIT
MIN TYP MAX
20
ns
7
13 ns
7
13 ns
4
ns
2
ns
4
ns
2
ns
4
ns
2
ns
Table 6-103. Switching Characteristics Over Recommended Operating Conditions for EMAC RMII
NO.
PARAMETER
4 td(REFCLK-TXD)
Output Delay Time, REF_CLK High to TXD Valid
5 td(REFCLK-TXEN)
Output Delay Time, REF_CLK High to TXEN Valid
(1) RMII is not supported at operating points below 1.1V nominal.
1.3V, 1.2V, 1.1V⁽¹⁾
UNIT
MIN TYP MAX
2.5
13 ns
2.5
13 ns
1
RMII_MHz_50_CLK
23
5
RMII_TXEN
RMII_TXD[1:0]
RMII_RXD[1:0]
RMII_CRS_DV
RMII_RXER
4
8
5
6
7
9
10
11
Figure 6-49. RMII Timing Diagram
194 Peripheral Information and Electrical Specifications
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