TMS320C6742_16 Datasheet, PDF (126/187 Pages) Texas Instruments – Fixed- and Floating-Point DSP

TMS320C6742
SPRS587E – JUNE 2009 – REVISED MARCH 2014
www.ti.com
Table 6-49. Switching Characteristics for McBSP1 [1.2V, 1.1V]^{(1) (2)}
(see Figure 6-29)
NO.
1
t_{d(CKSH-CKRXH)}
2
t_c(CKRX)
3
t_w(CKRX)
4
t_d(CKRH-FRV)
9
t_d(CKXH-FXV)
12 t_{dis(CKXH-DXHZ)}
13 t_d(CKXH-DXV)
14 t_d(FXH-DXV)
PARAMETER
Delay time, CLKS high to CLKR/X high for internal
CLKR/X generated from CLKS input
Cycle time, CLKR/X
CLKR/X int
Pulse duration, CLKR/X high or
CLKR/X low
CLKR/X int
Delay time, CLKR high to internal
FSR valid
CLKR int
CLKR ext
Delay time, CLKX high to internal
FSX valid
CLKX int
CLKX ext
Disable time, DX high impedance
following last data bit from CLKX
high
CLKX int
CLKX ext
CLKX int
Delay time, CLKX high to DX valid
CLKX ext
Delay time, FSX high to DX valid FSX int
ONLY applies when in data
delay 0 (XDATDLY = 00b) mode
FSX ext
1.2V
MIN
MAX
0.5
16.5
2P or 20⁽³⁾⁽⁴⁾
C - 2⁽⁵⁾
C + 2⁽⁵⁾
-4
1
-4
1
-4
-2
-4 + D1⁽⁶⁾
1 + D1⁽⁶⁾
-4 ⁽⁷⁾
6.5
16.5
6.5
16.5
6.5
16.5
6.5 + D2⁽⁶⁾
16.5 + D2⁽⁶⁾
6.5 ⁽⁷⁾
-2 ⁽⁷⁾
16.5 ⁽⁷⁾
1.1V
MIN
MAX
1.5
18
2P or 25^{(3) (4)}
C - 2⁽⁵⁾
C + 2⁽⁵⁾
-4
1
-4
1
-4
-2
-4 + D1⁽⁶⁾
1 + D1⁽⁶⁾
-4 ⁽⁷⁾
13
18
13
18
13
18
13 + D2⁽⁶⁾
18 + D2⁽⁶⁾
13 ⁽⁷⁾
-2 ⁽⁷⁾
18
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
(1) CLKRP = CLKXP = FSRP = FSXP = 0. If polarity of any of the signals is inverted, then the timing references of that signal are also
inverted.
(2) Minimum delay times also represent minimum output hold times.
(3) P = ASYNC3 period in ns. For example, when the ASYNC clock domain is running at 100 MHz, use 10 ns.
(4) Use whichever value is greater.
(5) C = H or L
S = sample rate generator input clock = P if CLKSM = 1 (P = ASYNC period)
S = sample rate generator input clock = P_clks if CLKSM = 0 (P_clks = CLKS period)
H = CLKX high pulse width = (CLKGDV/2 + 1) * S if CLKGDV is even
H = (CLKGDV + 1)/2 * S if CLKGDV is odd
L = CLKX low pulse width = (CLKGDV/2) * S if CLKGDV is even
L = (CLKGDV + 1)/2 * S if CLKGDV is odd
CLKGDV should be set appropriately to ensure the McBSP bit rate does not exceed the maximum limit (see (4) above).
(6) Extra delay from CLKX high to DX valid applies only to the first data bit of a device, if and only if DXENA = 1 in SPCR.
if DXENA = 0, then D1 = D2 = 0
if DXENA = 1, then D1 = 6P, D2 = 12P
(7) Extra delay from FSX high to DX valid applies only to the first data bit of a device, if and only if DXENA = 1 in SPCR.
if DXENA = 0, then D1 = D2 = 0
if DXENA = 1, then D1 = 6P, D2 = 12P
126 Peripheral Information and Electrical Specifications
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