TBD datasheet(58/80 Pages) FREESCALE

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MSC8144E Quad Core Digital Signal Processor Data Sheet, Rev. 6

Freescale Semiconductor

Figure 32 shows the RGMII AC timing and multiplexing diagrams.

GTX_CLK125 reference clock duty cycle

tG125H/tG125

—

Notes:

At recommended operating conditions with LVDD of 2.5 V +/- 5%.

This implies that PC board design will require clocks to be routed with no additional trace delay

For 10 and 100 Mbps, tRGT scales to 400 ns +/- 40 ns and 40 ns +/- 4 ns, respectively.

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.

Duty cycle reference is LVdd/2.

This symbol is used to represent the external GTX_CLK125 and does not follow the original symbol naming convention.

GCR4 should be programmed as 0x0004C130.

Figure 32. RGMII AC Timing and Multiplexing s

Table 51. RGMII with No On-Board Delay AC Timing Specifications (continued)

Parameter/Condition

Symbol

Min

Typ

Max

Unit

GTX_CLK

tRGT

tRGTH

tSKEWT

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)

tSKEWR

tSKEWT

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