TMS320VC5507_17 Datasheet, PDF (116/137 Pages) Texas Instruments – Fixed-Point Digital Signal Processor

Electrical Specifications
Table 5−33. McBSP as SPI Master or Slave Timing Requirements (CLKSTP = 11b, CLKXP = 1)^†‡
CVDD = 1.2 V
CVDD = 1.35 V
CVDD = 1.6 V
NO.
MASTER
SLAVE
MASTER
SLAVE
MIN MAX
MIN MAX MIN MAX
MIN MAX
MC23
tsu(DRV-CKXL)
Setup time, DR valid before CLKX
low
15
3 − 6P
10
3 − 6P
MC24
th(CKXL-DRV)
Hold time, DR valid after CLKX
low
0
3 + 6P
0
3 + 6P
MC36
tsu(FXL-CKXL)
Setup time, FSX low before CLKX
low
5
5
MC26 tc(CKX)
Cycle time, CLKX
2P
16P
2P
16P
† _{For all SPI slave modes, CLKG is programmed as 1/2 of the CPU clock by setting CLKSM = CLKGDV = 1.}
‡ _{P = 1/CPU clock frequency. For example, when running parts at 200 MHz, use P = 5 ns.}
UNIT
ns
ns
ns
ns
Table 5−34. McBSP as SPI Master or Slave Switching Characteristics (CLKSTP = 11b, CLKXP = 1)^†‡
NO.
PARAMETER
CVDD = 1.2 V
CVDD = 1.35 V
MASTER§
SLAVE
CVDD = 1.6 V
MASTER§
SLAVE
UNIT
MIN MAX
MIN MAX
MIN MAX
MIN MAX
MC37 td(CKXH-FXL)
Delay time, CLKX high
to FSX low¶
D−5
D+5
D−4 D+4
ns
MC38 td(FXL-CKXL)
Delay time, FSX low to
CLKX low#
T−5
T+5
T−4 T+4
ns
MC29
td(CKXH-DXV)
Delay time, CLKX high
to DX valid
−4
6 3P + 3 5P + 15
−3
3 3P + 3 5P + 8 ns
Disable time, DX high-
MC39
tdis(CKXH-DXHZ)
impedance following
last data bit from CLKX
−4
high
4 3P + 4 3P + 19
−3
1 3P + 3 3P + 12 ns
MC32 td(FXL-DXV)
Delay time, FSX low to
DX valid
C−4
C + 4 3P + 4 3P + 18
C−3
C + 3 3P + 4 3P + 10 ns
† _{For all SPI slave modes, CLKG is programmed as 1/2 of the CPU clock by setting CLKSM = CLKGDV = 1.}
‡ _{P = 1/CPU clock frequency. For example, when running parts at 200 MHz, use P = 5 ns.}
§ _{T = CLKX period = (1 + CLKGDV) * P}
C = CLKX low pulse width = T/2 when CLKGDV is odd or zero and = (CLKGDV/2) * P when CLKGDV is even
D = CLKX high pulse width = T/2 when CLKGDV is odd or zero and = (CLKGDV/2 + 1) * P when CLKGDV is even
¶ _{FSRP = FSXP = 1. As a SPI master, FSX is inverted to provide active-low slave-enable output. As a slave, the active-low signal input on FSX}
and FSR is inverted before being used internally.
CLKXM = FSXM = 1, CLKRM = FSRM = 0 for master McBSP
CLKXM = CLKRM = FSXM = FSRM = 0 for slave McBSP
# _{FSX should be low before the rising edge of clock to enable slave devices and then begin a SPI transfer at the rising edge of the master clock}
(CLKX).
116 SPRS244J
April 2004 − Revised January 2008