Datasheet

Bit 0 Bit(n-1) (n-2) (n-3) (n-4)
Bit 0 Bit(n-1) (n-2) (n-3) (n-4)
CLKX
FSX
DX
M30
M31
DR
M28
M24
M29
M25
LSB
MSB
M32
M33
M26
TMS320C28346, TMS320C28345, TMS320C28344
TMS320C28343, TMS320C28342, TMS320C28341
SPRS516D –MARCH 2009–REVISED AUGUST 2012 www.ti.com
6.16.2 McBSP as SPI Master or Slave Timing
Table 6-50. McBSP as SPI Master or Slave Timing Requirements (CLKSTP = 10b, CLKXP = 0)
MASTER SLAVE
NO. UNIT
MIN MAX MIN MAX
M30 t
su(DRV-CKXL)
Setup time, DR valid before CLKX low 30 8P – 10 ns
M31 t
h(CKXL-DRV)
Hold time, DR valid after CLKX low 1 8P – 10 ns
M32 t
su(BFXL-CKXH)
Setup time, FSX low before CLKX high 8P + 10 ns
M33 t
c(CKX)
Cycle time, CLKX 2P
(1)
16P ns
(1) 2P = 1/CLKG
Table 6-51. McBSP as SPI Master or Slave Switching Characteristics (CLKSTP = 10b, CLKXP = 0)
MASTER SLAVE
NO. PARAMETER UNIT
MIN MAX MIN MAX
M24 t
h(CKXL-FXL)
Hold time, FSX low after CLKX low 2P
(1)
ns
M25 t
d(FXL-CKXH)
Delay time, FSX low to CLKX high P ns
M26 t
d(CLKXH-DXV)
Delay time, CLKX low to DX valid –2 0 3P + 6 5P + 20 ns
M28 t
dis(FXH-DXHZ)
Disable time, DX high impedance following 6 6P + 6 ns
last data bit from FSX high
M29 t
d(FXL-DXV)
Delay time, FSX low to DX valid 6 4P + 6 ns
(1) 2P = 1/CLKG
For all SPI slave modes, CLKX has to be minimum 8 CLKG cycles. Also CLKG should be LSPCLK/2 by
setting CLKSM = CLKGDV = 1. With maximum LSPCLK speed of 150 MHz, CLKX maximum frequency
will be LSPCLK/16 , that is 9.375 MHz and P = 6.67 ns.
Figure 6-31. McBSP Timing as SPI Master or Slave: CLKSTP = 10b, CLKXP = 0
160 Electrical Specifications Copyright © 2009–2012, Texas Instruments Incorporated
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