SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

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SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

Table 7-86. Timing Requirements for EMAC RGMII Input Receive for 10/100/1000 Mbps(1) (see Figure 7-69)

 

 

 

-720

 

 

 

 

 

-850

 

 

NO.

 

 

A-1000/-1000

UNIT

 

 

 

-1200

 

 

 

 

 

MIN

MAX

 

5

tsu(RXD-RXCH)

Setup time, receive selected signals valid before RXC (at DSP) high/low

1.0

 

ns

6

th(RXCH-RXD)

Hold time, receive selected signals valid after RXC (at DSP) high/low

1.0

 

ns

(1)For RGMII, receive selected signals include: RXD[3:0] and RXCTL.

RXC (at DSP)(B)

RXD[3:0](A)

1

4 2

3

4

5

1st Half-byte

2nd Half-byte

 

6

 

 

 

RXD[3:0]RXD[7:4]

RXCTL(A)

RXDVRXERR

A.Data and control information is received using both edges of the clocks. RXD[3:0] carries data bits 3-0 on the rising edge of RXC and data bits 7-4 on the falling edge of RXC. Similarly, RXCTL carries RXDV on rising edge of RXC and RXERR on falling edge

B.RXC must be externally delayed relative to the data and control pins.

Figure 7-69. EMAC Receive Interface Timing [RGMII Operation](A)(B)

Table 7-87. Switching Characteristics Over Recommended Operating Conditions for TXC - RGMII

Operation for 10/100/1000 Mbit/s (see Figure 7-70)

 

 

 

 

-720

 

 

 

 

 

-850

 

NO.

 

 

 

A-1000/-1000

UNIT

 

 

 

 

-1200

 

 

 

 

 

MIN

MAX

 

 

 

 

10 Mbps

360

440

 

1

tc(TXC)

Cycle time, TXC

100 Mbps

36

44

ns

 

 

 

1000 Mbps

7.2

8.8

 

 

 

 

10 Mbps

0.40*tc(TXC)

0.60*tc(TXC)

 

2

tw(TXCH)

Pulse duration, TXC high

100 Mbps

0.40*tc(TXC)

0.60*tc(TXC)

ns

 

 

 

1000 Mbps

0.45*tc(TXC)

0.55*tc(TXC)

 

 

 

 

10 Mbps

0.40*tc(TXC)

0.60*tc(TXC)

 

3

tw(TXCL)

Pulse duration, TXC low

100 Mbps

0.40*tc(TXC)

0.60*tc(TXC)

ns

 

 

 

1000 Mbps

0.45*tc(TXC)

0.55*tc(TXC)

 

 

 

 

10 Mbps

 

0.75

 

4

tt(TXC)

Transition time, TXC

100 Mbps

 

0.75

ns

 

 

 

1000 Mbps

 

0.75

 

214

C64x+ Peripheral Information and Electrical Specifications

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Texas Instruments SM320C6455-EP manual Cycle time, TXC Mbps 40*t cTXC 60*t cTXC