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参数资料
型号： TMS320C2812ZHHS
厂商： TEXAS INSTRUMENTS INC
元件分类： 数字信号处理
英文描述： 16-BIT, 150 MHz, OTHER DSP, PBGA179
封装： LEAD FREE, BGA-179
文件页数： 6/156页
文件大小： 1826K
代理商： TMS320C2812ZHHS
Electrical Specifications
103
April 2001 Revised October 2005
SPRS174M
6.14.2
Output Clock Characteristics
Table 68. XCLKOUT Switching Characteristics (PLL Bypassed or Enabled)
No.
PARAMETER
MIN
TYP
MAX
UNIT
C1
tc(XCO)
Cycle time, XCLKOUT
6.67§
ns
C3
tf(XCO)
Fall time, XCLKOUT
2
ns
C4
tr(XCO)
Rise time, XCLKOUT
2
ns
C5
tw(XCOL)
Pulse duration, XCLKOUT low
H2
H+2
ns
C6
tw(XCOH)
Pulse duration, XCLKOUT high
H2
H+2
ns
C7
tp
PLL lock time
131 072tc(CI)
ns
A load of 40 pF is assumed for these parameters.
H = 0.5tc(XCO)
§ The PLL must be used for maximum frequency operation.
This parameter has changed from 4096 XCLKIN cycles in the earlier revisions of the silicon.
C4
C3
XCLKOUT
(see Note B)
XCLKIN
C5
C9
C10
C1
C8
C6
(see Note A)
NOTES: A. The relationship of XCLKIN to XCLKOUT depends on the divide factor chosen. The waveform relationship shown in Figure 69 is
intended to illustrate the timing parameters only and may differ based on configuration.
B. XCLKOUT configured to reflect SYSCLKOUT.
Figure 69. Clock Timing
6.15
Reset Timing
Table 69. Reset (XRS) Timing Requirements
MIN
NOM
MAX
UNIT
tw(RSL1)
Pulse duration, stable XCLKIN to XRS high
8tc(CI)
cycles
tw(RSL2)
Pulse duration, XRS low
Warm reset
8tc(CI)
cycles
tw(WDRS)
Pulse duration, reset pulse generated by watchdog
512tc(CI)
cycles
td(EX)
Delay time, address/data valid after XRS high
32tc(CI)
cycles
tOSCST
Oscillator start-up time
1
10
ms
tsu(XPLLDIS)
Setup time for XPLLDIS pin
16tc(CI)
cycles
th(XPLLDIS)
Hold time for XPLLDIS pin
16tc(CI)
cycles
th(XMP/MC)
Hold time for XMP/MC pin
16tc(CI)
cycles
th(boot-mode)
Hold time for boot-mode pins
2520tc(CI)§
cycles
If external oscillator/clock source are used, reset time has to be low at least for 1 ms after VDD reaches 1.5 V.
Dependent on crystal/resonator and board design.
§ The boot ROM reads the password locations. Therefore, this timing requirement includes the wakeup time for flash. See the TMS320x281x Boot
ROM Reference Guide (literature number SPRU095) and TMS320x281x System Control and Interrupts Reference Guide (literature number
SPRU078) for further information.
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