AM1705_1004 Datasheet, PDF (81/155 Pages) Texas Instruments – AM1705 ARM Microprocessor

AM1705
www.ti.com
HEX ADDRESS RANGE
0x01E2 0000 - 0x01E2 1FFF
SPRS657A – FEBRUARY 2010 – REVISED APRIL 2010
Table 6-34. EMAC Control Module RAM
EMAC Local Buffer Descriptor Memory
Table 6-35. RMII Timing Requirements
No.
PARAMETER
1 tc(REFCLK)
Cycle Time, REF_CLK
2 tw(REFCLKH)
Pulse Width, REF_CLK High
3 tw(REFCLKL)
Pulse Width, REF_CLK Low
6 tsu(RXD-REFCLK) Input Setup Time, RXD Valid before REF_CLK High
7 th(REFCLK-RXD)
Input Hold Time, RXD Valid after REF_CLK High
8 tsu(CRSDV-REFCLK) Input Setup Time, CRSDV Valid before REF_CLK High
9 th(REFCLK-CRSDV) Input Hold Time, CRSDV Valid after REF_CLK High
10 tsu(RXER-REFCLK) Input Setup Time, RXER Valid before REF_CLK High
11 th(REFCLKR-RXER) Input Hold Time, RXER Valid after REF_CLK High
MIN
TYP
MAX
UNIT
20
ns
7
13
ns
7
13
ns
4
ns
2
ns
4
ns
2
ns
4
ns
2
ns
No.
4 td(REFCLK-TXD)
5 td(REFCLK-TXEN)
Table 6-36. RMII Timing Requirements
PARAMETER
Output Delay Time, REF_CLK High to TXD Valid
Output Delay Time, REF_CLK High to TXEN Valid
MIN
TYP
MAX
UNIT
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 6-25. RMII Timing Diagram
Copyright © 2010, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
81
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