TMS320F2810, TMS320F2811, TMS320F2812
TMS320C2810, TMS320C2811, TMS320C2812
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SPRS174S–APRIL 2001–REVISED MARCH 2011
6.14.2 Output Clock Characteristics
Table 6-10. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)(1)(2)
NO.
C1
C3
C4
C5
C6
C7
PARAMETER
Cycle time, XCLKOUT
MIN
6.67(3)
TYP
MAX UNIT
tc(XCO)
tf(XCO)
tr(XCO)
tw(XCOL)
tw(XCOH)
tp
ns
ns
ns
Fall time, XCLKOUT
2
2
Rise time, XCLKOUT
Pulse duration, XCLKOUT low
Pulse duration, XCLKOUT high
PLL lock time(4)
H – 2
H – 2
H + 2
H + 2
ns
ns
ns
131072tc(CI)
(1) A load of 40 pF is assumed for these parameters.
(2) H = 0.5tc(XCO)
(3) The PLL must be used for maximum frequency operation.
(4) This parameter has changed from 4096 XCLKIN cycles in the earlier revisions of the silicon.
C10
C8
C9
XCLKIN(A)
C6
C3
C1
C4
C5
XCLKOUT(A)(B)
A. The relationship of XCLKIN to XCLKOUT depends on the divide factor chosen. The waveform relationship shown in
Figure 6-10 is intended to illustrate the timing parameters only and may differ based on configuration.
B. XCLKOUT configured to reflect SYSCLKOUT.
Figure 6-10. Clock Timing
6.15 Reset Timing
Table 6-11. Reset (XRS) Timing Requirements(1)
MIN
8tc(CI)
8tc(CI)
NOM
MAX
UNIT
cycles
cycles
tw(RSL1)
tw(RSL2)
Pulse duration, stable XCLKIN to XRS high
Pulse duration, XRS low
Warm reset
Pulse duration, reset pulse generated by
watchdog
tw(WDRS)
td(EX)
512tc(CI)
cycles
cycles
Delay time, address/data valid after XRS
high
32tc(CI)
10
(2)
tOSCST
Oscillator start-up time
1
16tc(CI)
16tc(CI)
ms
tsu(XPLLDIS)
th(XPLLDIS)
th(XMP/MC)
th(boot-mode)
Setup time for XPLLDIS pin
Hold time for XPLLDIS pin
Hold time for XMP/MC pin
Hold time for boot-mode pins
cycles
cycles
cycles
cycles
16tc(CI)
(3)
2520tc(CI)
(1) If external oscillator/clock source are used, reset time has to be low at least for 1 ms after VDD reaches 1.5 V.
(2) Dependent on crystal/resonator and board design.
(3) The boot ROM reads the password locations. Therefore, this timing requirement includes the wakeup time for flash. See the
TMS320x281x DSP Boot ROM Reference Guide (literature number SPRU095) and the TMS320x281x DSP System Control and
Interrupts Reference Guide (literature number SPRU078) for further information.
Copyright © 2001–2011, Texas Instruments Incorporated
Electrical Specifications
103
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