参数资料
型号: SM320C6201BW14
厂商: Texas Instruments, Inc.
元件分类: 数字信号处理
英文描述: FLOATING-POINT DIGITAL SIGNAL PROCESSOR
中文描述: 浮点数字信号处理器
文件页数: 55/64页
文件大小: 939K
代理商: SM320C6201BW14
SGUS030B
APRIL 2000
REVISED MAY 2001
55
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251
1443
MULTICHANNEL BUFFERED SERIAL PORT TIMING (CONTINUED)
switching characteristics for McBSP as SPI master or slave: CLKSTP = 11b, CLKXP = 0
(see Figure 34)
NO.
PARAMETER
C6701-14
C6701-16
UNIT
MASTER
§
MIN
SLAVE
MIN
MAX
MAX
1
th(CKXL-FXL)
td(FXL-CKXH)
td(CKXL-DXV)
Hold time, FSX low after CLKX low
Delay time, FSX low to CLKX high#
L
4
L + 4
ns
2
T
4
T + 4
ns
3
Delay time, CLKX low to DX valid
4
4
3P + 1
5P + 17
ns
6
tdis(CKXL-DXHZ)
Disable time, DX high impedance following last data bit
from CLKX low
*
2
*4
*3P + 4
*5P + 17
ns
7
td(FXL-DXV)
Delay time, FSX low to DX valid
*H
2
*H + 3
2P + 1
4P + 13
ns
*This parameter is not tested.
The effects of internal clock jitter are included at test. There is no need to adjust timing numbers for internal clock jitter. P = 1/CPU clock frequency
in ns. For example, when running parts at 167 MHz, use P = 6 ns.
For all SPI slave modes, CLKG is programmed as 1/2 of the CPU clock by setting CLKSM = CLKGDV = 1.
§
S =
sample rate generator input clock = P if CLKSM = 1 (P = 1/CPU clock frequency)
=
sample rate generator input clock = P_clks if CLKSM = 0 (P_clks = CLKS period)
T =
CLKX period = (1 + CLKGDV) * S
H =
CLKX high pulse width = (CLKGDV/2 + 1) * S if CLKGDV is even
= (CLKGDV + 1)/2 * S if CLKGDV is odd or zero
L =
CLKX low pulse width
= (CLKGDV/2) * S if CLKGDV is even
= (CLKGDV + 1)/2 * S if CLKGDV is odd or zero
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).
Bit 0
Bit(n-1)
(n-2)
(n-3)
(n-4)
Bit 0
Bit(n-1)
(n-2)
(n-3)
(n-4)
4
3
7
6
2
1
CLKX
FSX
DX
DR
5
Figure 34. McBSP Timing as SPI Master or Slave: CLKSTP = 11b, CLKXP = 0
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