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| 型号： | MPC8555ECVTAJD |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 533 MHz, RISC PROCESSOR, PBGA783 |
| 封装： | 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, FLIP CHIP, PLASTIC, BGA-783 |
| 文件页数： | 15/88页 |
| 文件大小： | 1110K |
| 代理商： | MPC8555ECVTAJD |
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MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specification, Rev. 4.2
22
Freescale Semiconductor
Ethernet: Three-Speed, MII Management
7.2
DUART AC Electrical Specifications
Table 17 provides the AC timing parameters for the DUART interface of the MPC8555E.
8
Ethernet: Three-Speed, MII Management
This section provides the AC and DC electrical characteristics for three-speed, 10/100/1000, and MII
management.
8.1
Three-Speed Ethernet Controller (TSEC)
(10/100/1000 Mbps)—GMII/MII/TBI/RGMII/RTBI Electrical
Characteristics
The electrical characteristics specified here apply to all GMII (gigabit media independent interface), the
MII (media independent interface), TBI (ten-bit interface), RGMII (reduced gigabit media independent
interface), and RTBI (reduced ten-bit interface) signals except MDIO (management data input/output) and
MDC (management data clock). The RGMII and RTBI interfaces are defined for 2.5 V, while the GMII
and TBI interfaces can be operated at 3.3 V or 2.5 V. Whether the GMII, MII, or TBI interface is operated
at 3.3 or 2.5 V, the timing is compliant with the IEEE 802.3 standard. The RGMII and RTBI interfaces
follow the Hewlett-Packard reduced pin-count interface for Gigabit Ethernet Physical Layer Device
Specification Version 1.2a (9/22/2000). The electrical characteristics for MDIO and MDC are specified in
8.1.1
TSEC DC Electrical Characteristics
All GMII, MII, TBI, RGMII, and RTBI drivers and receivers comply with the DC parametric attributes
specified in Table 18 and Table 19. The potential applied to the input of a GMII, MII, TBI, RGMII, or
RTBI receiver may exceed the potential of the receiver’s power supply (for example, a GMII driver
powered from a 3.6-V supply driving VOH into a GMII receiver powered from a 2.5-V supply). Tolerance
for dissimilar GMII driver and receiver supply potentials is implicit in these specifications. The RGMII
and RTBI signals are based on a 2.5-V CMOS interface voltage as defined by JEDEC EIA/JESD8-5.
Table 17. DUART AC Timing Specifications
Parameter
Value
Unit
Notes
Minimum baud rate
fCCB_CLK / 1048576
baud
3
Maximum baud rate
fCCB_CLK / 16
baud
1, 3
Oversample rate
16
—
2, 3
Notes:
1. Actual attainable baud rate is limited by the latency of interrupt processing.
2. The middle of a start bit is detected as the 8th sampled 0 after the 1-to-0 transition of the start
bit. Subsequent bit values are sampled each 16th sample.
3. Guaranteed by design.
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