KMPC8315CVRAGDA Datasheet, PDF (26/106 Pages) Freescale Semiconductor, Inc – PowerQUICC II Pro Processor Hardware Specifications

Ethernet: Three-Speed Ethernet, MII Management
Table 24. RGMII/RTBI (When Operating at 2.5 V) DC Electrical Characteristics (continued)
Parameters
Symbol
Conditions
Min
Note:
1. The symbol V_IN, in this case, represents the LV_IN symbol referenced in Table 1 and Table 2.
Max
Unit
9.2 MII, RMII, RGMII, and RTBI AC Timing Specifications
The AC timing specifications for MII, RMII, RGMII, and RTBI are presented in this section.
9.2.1 MII AC Timing Specifications
This section describes the MII transmit and receive AC timing specifications.
9.2.1.1 MII Transmit AC Timing Specifications
This table provides the MII transmit AC timing specifications.
Table 25. MII Transmit AC Timing Specifications
At recommended operating conditions with LVDD of 3.3 V ± 300 mv.
Parameter/Condition
Symbol ¹
Min
Typ
Max
Unit
TX_CLK clock period 10 Mbps
t_MTX
—
400
—
ns
TX_CLK clock period 100 Mbps
t_MTX
—
40
—
ns
TX_CLK duty cycle
t_MTXH/t_MTX
35
—
65
%
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
t_MTKHDX
1
5
15
ns
TX_CLK data clock rise V_IL(min) to V_IH(max)
t_MTXR
1.0
—
4.0
ns
TX_CLK data clock fall V_IH(max) to V_IL(min)
t_MTXF
1.0
—
4.0
ns
Note:
1. The symbols used for timing specifications follow the pattern of t_{(first two letters of functional block)(signal)(state)(reference)(state)} for
inputs and t_{(first two letters of functional block)(reference)(state)(signal)(state)} for outputs. For example, t_MTKHDX symbolizes MII transmit
timing (MT) for the time t_MTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,
the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.
For example, the subscript of t_MTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).
This figure shows the MII transmit AC timing diagram.
t_MTX
t_MTXR
TX_CLK
TXD[3:0]
TX_EN
TX_ER
t_MTXH
t_MTXF
t_MTKHDX
Figure 10. MII Transmit AC Timing Diagram
MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
26
Freescale Semiconductor