TMS320F2809, TMS320F2808, TMS320F2806

TMS320F2802, TMS320F2801, TMS320C2802

TMS320C2801, TMS320F28016, TMS320F28015

SPRS230L –OCTOBER 2003 –REVISED DECEMBER 2009www.ti.com

Table 6-13. Reset (XRS) Timing Requirements

 

 

 

 

 

 

 

 

 

 

 

MIN

NOM

MAX

UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

Pulse duration, stable XCLKIN to XRS high

 

8tc(OSCCLK)

 

 

cycles

tw(RSL1)

 

 

 

tw(RSL2)

Pulse duration,

 

low

Warm reset

8tc(OSCCLK)

 

 

cycles

XRS

 

 

tw(WDRS)

Pulse duration, reset pulse generated by

 

 

512tc(OSCCLK)

 

cycles

watchdog

 

 

 

td(EX)

Delay time, address/data valid after

 

 

high

 

 

32tc(OSCCLK)

 

cycles

XRS

 

 

 

(2)

Oscillator start-up time

 

1

10

 

ms

tOSCST

 

 

th(boot-mode)

Hold time for boot-mode pins

 

200tc(OSCCLK)

 

 

cycles

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)In addition to the tw(RSL1) requirement, XRS has to be low at least for 1 ms after VDD reaches 1.5 V.

(2)Dependent on crystal/resonator and board design.

XCLKIN

X1/X2

XCLKOUT

XRS

Address/Data/ Control (Internal)

Boot-Mode Pins

I/O Pins

OSCCLK * 5

User-Code Execution

Peripheral/GPIO Function

User-Code Dependent

OSCCLK/8

User-Code Dependent

tw(RSL2)

User-Code Execution Phase

td(EX)

(Don't Care)

Boot-ROM Execution Starts

th(boot-mode)(A)

GPIO Pins as Input

Peripheral/GPIO Function

 

User-Code Execution Starts

GPIO Pins as Input (State Depends on Internal PU/PD)

 

User-Code Dependent

A.After reset, the Boot ROM code samples BOOT Mode pins. Based on the status of the Boot Mode pin, the boot code branches to destination memory or boot code function. If Boot ROM code executes after power-on conditions (in debugger environment), the Boot code execution time is based on the current SYSCLKOUT speed. The SYSCLKOUT will be based on user environment and could be with or without PLL enabled.

Figure 6-9. Warm Reset

108

Electrical Specifications

Copyright © 2003–2009, Texas Instruments Incorporated

 

 

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Texas Instruments TMS320F2809, TMS320F2808, TMS320C2802, TMS320C2801 Reset XRS Timing Requirements, Xclkout XRS, OSCCLK/8