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
DR
M54
M58
M56
M53
M55
M59
M57
LSB
MSB
M60
M61
TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
www.ti.com SPRS439M –JUNE 2007–REVISED AUGUST 2012
Table 6-63. McBSP as SPI Master or Slave Timing Requirements (CLKSTP = 11b, CLKXP = 1)
MASTER SLAVE
NO. UNIT
MIN MAX MIN MAX
M58 t
su(DRV-CKXL)
Setup time, DR valid before CLKX low 30 8P – 10 ns
M59 t
h(CKXL-DRV)
Hold time, DR valid after CLKX low 1 8P – 10 ns
M60 t
su(FXL-CKXL)
Setup time, FSX low before CLKX low 16P + 10 ns
M61 t
c(CKX)
Cycle time, CLKX 2P
(1)
16P ns
(1) 2P = 1/CLKG
Table 6-64. McBSP as SPI Master or Slave Switching Characteristics (CLKSTP = 11b, CLKXP = 1)
(1)
MASTER
(2)
SLAVE
NO. PARAMETER UNIT
MIN MAX MIN MAX
M53 t
h(CKXH-FXL)
Hold time, FSX low after CLKX high P ns
M54 t
d(FXL-CKXL)
Delay time, FSX low to CLKX low 2P
(1)
ns
M55 t
d(CLKXH-DXV)
Delay time, CLKX high to DX valid –2 0 3P + 6 5P + 20 ns
M56 t
dis(CKXH-DXHZ)
Disable time, DX high impedance following last P + 6 7P + 6 ns
data bit from CLKX high
M57 t
d(FXL-DXV)
Delay time, FSX low to DX valid 6 4P + 6 ns
(1) 2P = 1/CLKG
(2) C = CLKX low pulse width = P
D = CLKX high pulse width = P
For all SPI slave modes, CLKX must be a minimum of 8 CLKG cycles. Also CLKG should be LSPCLK/2
by setting CLKSM = CLKGDV = 1. With maximum LSPCLK speed of 75 MHz, CLKX maximum frequency
is LSPCLK/16 , that is 4.6875 MHz and P = 13.3 ns.
Figure 6-40. McBSP Timing as SPI Master or Slave: CLKSTP = 11b, CLKXP = 1
Copyright © 2007–2012, Texas Instruments Incorporated Electrical Specifications 181
Submit Documentation Feedback
Product Folder Link(s): TMS320F28335 TMS320F28334 TMS320F28332 TMS320F28235 TMS320F28234
TMS320F28232