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| 型号： | MPC8308ZQAGD |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 13/83页 |
| 文件大小： | 0K |
| 描述： | MPU POWERQUICC II PRO 473MAPBGA |
| 标准包装： | 84 |
| 系列： | MPC83xx |
| 处理器类型： | 32-位 MPC83xx PowerQUICC II Pro |
| 速度： | 400MHz |
| 电压： | 1V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 473-LFBGA |
| 供应商设备封装： | 473-MAPBGA（19x19） |
| 包装： | 托盘 |
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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
20
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
This figure shows the RGMII AC timing and multiplexing diagrams.
Figure 11. RGMII AC Timing and Multiplexing Diagrams
8.3
Ethernet Management Interface Electrical Characteristics
The electrical characteristics specified here apply to MII management interface signals MDIO
(management data input/output) and MDC (management data clock). The electrical characteristics for MII
GTX_CLK125 reference clock period
tG12
6
—8.0
—
ns
GTX_CLK125 reference clock duty cycle
tG125H/tG125
47
—
53
%
Notes:
1. In general, the clock reference symbol representation for this section is based on the symbols RGT to represent RGMII timing.
For example, the subscript of tRGT represents the RGMII receive (RX) clock. Note also that the notation for rise (R) and fall
(F) times follows the clock symbol that is being represented. For symbols representing skews, the subscript is skew (SK)
followed by the clock that is being skewed (RGT).
2. This implies that PC board design requires clocks to be routed such that an additional trace delay of greater than 1.5 ns is
added to the associated clock signal.
3. For 10 and 100 Mbps, tRGT scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
4. Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet's clock domains as long
as the minimum duty cycle is not violated and stretching occurs for no more than three tRGT of the lowest speed transitioned
between.
5. Duty cycle reference is 0.5*LVDD
6. This symbol is used to represent the external GTX_CLK125 and does not follow the original symbol naming convention.
Table 25. RGMII AC Timing Specifications (continued)
At recommended operating conditions with LVDD of 2.5 V ± 5%.
GTX_CLK
tRGT
tRGTH
tSKRGT
TX_CTL
TXD[8:5]
TXD[7:4]
TXD[9]
TXERR
TXD[4]
TXEN
TXD[3:0]
(At Transmitter)
TXD[8:5][3:0]
TXD[7:4][3:0]
TX_CLK
(At PHY)
RX_CTL
RXD[8:5]
RXD[7:4]
RXD[9]
RXERR
RXD[4]
RXDV
RXD[3:0]
RXD[8:5][3:0]
RXD[7:4][3:0]
RX_CLK
(At PHY)
tSKRGT
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