TMS320C6457CCMH Datasheet, PDF (170/217 Pages) Texas Instruments – Communications Infrastructure Digital Signal Processor

TMS320C6457
Communications Infrastructure Digital Signal Processor
SPRS582B—July 2010
www.ti.com
Table 7-76 Switching Characteristics for McBSP ^{(1) (2) (3)}
(see Figure 7-36)
No.
1 t_{d(CKSH-CKRXH)}
2 t_c(CKRX)
3 t_w(CKRX)
4 t_d(CKRH-FRV)
9 t_d(CKXH-FXV)
Parameter
Delay time, CLKS high to CLKR/X high for internal CLKR/X generated from CLKS input. ⁽⁴⁾
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
Delay time, CLKX high to internal FSX valid
CLKX int
CLKX ext
12 t_{dis(CKXH-DXHZ)} Disable time, DX Hi-Z following last data bit from CLKX high
CLKX int
CLKX ext
13 t_d(CKXH-DXV) Delay time, CLKX high to DX valid
CLKX int
CLKX ext
14 t_d(FXH-DXV)
Delay time, FSX high to DX valid applies ONLY when in data delay 0
(XDATDLY = 00b) mode
FSX int
FSX ext
End of Table 7-76
Min
Max Unit
1.4
10P ^{(5) (6) (7)}
10 ns
ns
0.5t_c(CKRX) - 1
-2.1
ns
3 ns
-1.7
3
ns
1.7
9
-3.9
4
ns
2
9
-3.9
4 ns
2
9
-2.3 + D1 ⁽⁸⁾ 5.6 + D2 ⁽⁸⁾
1.9 + D1 ⁽⁸⁾ 9 + D2 ^{(8) ns}
1 Over recommended operating conditions.
2 CLKRP = CLKXP = FSRP = FSXP = 0. If polarity of any of the signals is inverted, then the timing references of that signal are also inverted.
3 Minimum delay times also represent minimum output hold times.
4 The CLKS signal is shared by both McBSP0 and McBSP1 on this device.
5 Minimum CLKR ÷ X cycle times must be met, even when CLKR ÷ X is generated by an internal clock source. Minimum CLKR ÷ X cycle times are based on internal logic speed;
the maximum usable speed may be lower due to EDMA limitations and AC timing requirements
6 P = 1/SYSREFCLK frequency in ns. For example, when running parts at 1000 MHz, use P = 1 ns.
7 Use whichever value is greater
8 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 = 4P, D2 = 8P
170 C64x+ Peripheral Information and Electrical Specifications
2009 Texas Instruments Incorporated