SPRS292 − OCTOBER 2005

MULTICHANNEL BUFFERED SERIAL PORT TIMING (CONTINUED)

CLKX

 

 

 

 

 

 

1

2

 

 

 

FSX

 

 

 

 

 

 

6

7

3

 

 

DX

Bit 0

Bit(n-1)

(n-2)

(n-3)

(n-4)

 

 

4

5

 

 

 

 

 

 

 

DR

Bit 0

Bit(n-1)

(n-2)

(n-3)

(n-4)

Figure 49. McBSP Timing as SPI Master or Slave: CLKSTP = 11b, CLKXP = 0

timing requirements for McBSP as SPI master or slave: CLKSTP = 10b, CLKXP = 1†‡

(see Figure 50)

 

 

 

GDPA-167

 

 

 

 

 

ZDPA−167

 

 

NO.

 

 

 

−200

 

UNIT

 

 

 

−250

 

 

 

 

 

 

 

 

 

 

 

MASTER

 

SLAVE

 

 

 

 

 

 

 

 

 

 

 

 

MIN MAX

 

MIN

MAX

 

 

 

 

 

 

 

 

 

4

tsu(DRV-CKXH)

Setup time, DR valid before CLKX high

12

 

2 − 6P

 

ns

5

th(CKXH-DRV)

Hold time, DR valid after CLKX high

4

 

5 + 12P

 

ns

P = 1/CPU clock frequency in ns. For example, when running parts at 250 MHz, use P = 4 ns.

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

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Motorola TMS320C6711D warranty GDPA-167