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
TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439M –JUNE 2007–REVISED AUGUST 2012 www.ti.com
6.16.2 McBSP as SPI Master or Slave Timing
Table 6-57. 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 6-58. 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
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 75 MHz, CLKX maximum frequency will
be LSPCLK/16 , that is 4.6875 MHz and P = 13.3 ns.
Figure 6-37. McBSP Timing as SPI Master or Slave: CLKSTP = 10b, CLKXP = 0
178 Electrical Specifications Copyright © 2007–2012, Texas Instruments Incorporated
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