PPC8567CVTAQGGA datasheet(38/139 Pages) FREESCALE

38 / 139 page

MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Ethernet Interface and MII Management

Duty cycle for 10BASE-T and 100BASE-TX 3, 4

tRGTH/tRGT

Rise time (20%–80%)

tRGTR

—0.75

1.5

Fall time (20%–80%)

tRGTF

—0.75

1.5

EC_GTX_CLK125 clock rise time (20%-80%)

tG125R

—0.75

1.5

EC_GTX_CLK125 clock fall time (80%-20%)

tG125F

—0.75

1.5

EC_GTX_CLK125 duty cycle6

tG125H/tG125

Notes:

1. Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to

represent RGMII and RTBI timing. For example, the subscript of tRGT represents the TBI (T) 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 will require clocks to be routed such that an additional trace delay of greater than

1.5 ns will be 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. Guaranteed by characterization

6. EC_GTX_CLK125 is used to generate GTX_CLK for the eTSEC transmitter with 2% degradation. EC_GTX_CLK125

duty cycle can be loosen from 47/53% as long as the PHY device can tolerate the duty cycle generated by the eTSEC

GTX_CLK.

Table 34. RGMII and RTBI AC Timing Specifications (continued)

At recommended operating conditions with LVDD of 2.5 V ± 5%.

PPC8567CVTAQGGA 数据表(PDF) 38 Page - Freescale Semiconductor, Inc

PPC8567CVTAQGGA 数据表(HTML) 38 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

PPC8567CVTAQGGA 数据表(PDF) 38 Page - Freescale Semiconductor, Inc

PPC8567CVTAQGGA 数据表(HTML) 38 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载