MPC8308-RDB Freescale Semiconductor, MPC8308-RDB Datasheet - Page 20

• Manufacturer Part Number: MPC8308-RDB
• Description: BOARD REF DESIGN MPC8308
• Manufacturer: Freescale Semiconductor
• Series: PowerQUICC II™ PROr
• Type: MPUr

Specifications of MPC8308-RDB

• Contents: Board, Cables, Documentation, Power Supply, Software
• Ethernet Connection Type: Serial to Ethernet
• Data Rate: 10 Mbps, 100 Mbps, 1000 Mbps
• Memory Type: DDR2, SDRAM
• Interface Type: HSSI
• Operating Voltage: 1.5 V
• Operating Current: 5 uA
• Maximum Power Dissipation: 1000 mW
• Operating Temperature Range: - 55 C to + 125 C
• Product: Modules
• For Use With/related Products: MPC8308
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Ethernet: Three-Speed Ethernet, MII Management
Figure 11
8.3
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
20
At recommended operating conditions with LV
GTX_CLK125 reference clock period
GTX_CLK125 reference clock duty cycle
Notes:
1. Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to represent
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
3. For 10 and 100 Mbps, t
4. Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet's clock domains as long
5. Duty cycle reference is 0.5*LV
6. This symbol is used to represent the external GTX_CLK125 and does not follow the original symbol naming convention.
RGMII timing. For example, the subscript of t
(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).
added to the associated clock signal.
as the minimum duty cycle is not violated and stretching occurs for no more than three t
between.
(At Transmitter)
Ethernet Management Interface Electrical Characteristics
shows the RGMII AC timing and multiplexing diagrams.
RXD[8:5][3:0]
RXD[7:4][3:0]
TXD[8:5][3:0]
TXD[7:4][3:0]
GTX_CLK
(At PHY)
(At PHY)
RX_CTL
RX_CLK
TX_CLK
TX_CTL
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
RGT
Figure 11. RGMII AC Timing and Multiplexing Diagrams
scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
Table 25. RGMII AC Timing Specifications (continued)
DD
DD
RXD[3:0]
TXD[3:0]
RXD[4]
TXD[4]
of 2.5 V ± 5%.
TXEN
RXDV
RGT
represents the RGMII receive (RX) clock. Note also that the notation for rise
RXD[8:5]
RXD[7:4]
TXD[8:5]
TXD[7:4]
RXERR
TXERR
RXD[9]
TXD[9]
t
G125H
t
G12
/t
G125
6
t
t
SKRGT
SKRGT
t
RGTH
47
—
RGT
t
8.0
of the lowest speed transitioned
—
RGT
Freescale Semiconductor
t
t
SKRGT
SKRGT
53
—
ns
%