Texas Instruments TMS320C6712D Timing requirements for FSR when Gsync = 1 see Figure, Clks

Models: TMS320C6712D

1 102
Download 102 pages 54.97 Kb
Page 89
Image 89

SPRS293 − OCTOBER 2005

MULTICHANNEL BUFFERED SERIAL PORT TIMING (CONTINUED)

timing requirements for FSR when GSYNC = 1 (see Figure 42)

NO.

 

 

 

 

 

 

 

−150

 

UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIN

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

tsu(FRH-CKSH)

Setup time, FSR high before CLKS high

 

 

 

 

 

4

 

ns

2

th(CKSH-FRH)

Hold time, FSR high after CLKS high

 

 

 

 

 

4

 

ns

 

 

CLKS

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FSR external

CLKR/X (no need to resync)

CLKR/X (needs resync)

Figure 42. FSR Timing When GSYNC = 1

timing requirements for McBSP as SPI master or slave: CLKSTP = 10b, CLKXP = 0†‡ (see Figure 43)

 

 

 

 

−150

 

 

 

 

 

 

 

 

 

 

NO.

 

 

MASTER

 

SLAVE

 

UNIT

 

 

 

MIN MAX

 

MIN

MAX

 

 

 

 

 

 

 

 

 

4

tsu(DRV-CKXL)

Setup time, DR valid before CLKX low

12

 

2 − 6P

 

ns

5

th(CKXL-DRV)

Hold time, DR valid after CLKX low

4

 

5 + 12P

 

ns

P = 1/CPU clock frequency in ns. For example, when running parts at 150 MHz, use P = 6.7 ns.

For all SPI slave modes, CLKG is programmed as 1/2 of the CPU clock by setting CLKSM = CLKGDV = 1.

POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443

89

Page 89
Image 89
Texas Instruments TMS320C6712D Timing requirements for FSR when Gsync = 1 see Figure, Clks, Master Slave Unit MIN MAX