Texas Instruments TMS320C6712D - Manual (Page 89)

TMS320C6712D
FLOATINGĆPOINT DIGITAL SIGNAL PROCESSOR
SPRS293 − OCTOBER 2005
89 POST OFFICE BOX 1443
•
HOUSTON, TEXAS 77251−1443
MULTICHANNEL BUFFERED SERIAL PORT TIMING (CONTINUED)
timing requirements for FSR when GSYNC = 1 (see Figure 42)
NO.
−150
UNIT NO.
MIN MAX
UNIT
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
2
1
CLKS
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 NO.
MIN MAX MIN MAX
UNIT
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.