Datasheet

t
h(XPLLDIS)
t
h(XMP/MC)
t
h(boot-mode)
(C)
V , V
V , V
(3.3 V)
DDIO DD3VFL
DDAn DDAIO
(A)
XCLKIN
2.5 V
X1
XRS
XF/XPLLDIS
XMP/MC
Boot-Mode Pins
V , V
[1.8 V (or 1.9 V)]
DD DD1
XCLKOUT
I/O Pins
User-Code Dependent
User-Code Dependent
User-Code Dependent
Boot-ROM Execution Starts
Peripheral/GPIO Function
Based on Boot Code
GPIO Pins as Input
XPLLDIS Sampling
GPIOF14
GPIO Pins as Input (State Depends on Internal PU/PD)
(Don’t Care)
(Don’t Care)
User-Code Dependent
Address/
Data/
Control
User-Code Execution Phase
XCLKIN/8
(B)
t
d(EX)
(D)
t
su(XPLLDIS)
0.3 V
t
OSCST
t
w(RSL1)
Address/Data Valid. Internal Boot-ROM Code Execution Phase
TMS320F2810, TMS320F2811, TMS320F2812
TMS320C2810, TMS320C2811, TMS320C2812
www.ti.com SPRS174T –APRIL 2001–REVISED MAY 2012
A. V
DDAn
– V
DDA1
/V
DDA2
and AVDDREFBG
B. Upon power up, SYSCLKOUT is XCLKIN/2 if the PLL is enabled. Since both the XTIMCLK and CLKMODE bits in the
XINTCNF2 register come up with a reset state of 1, SYSCLKOUT is further divided by 4 before it appears at
XCLKOUT. This explains why XCLKOUT = XCLKIN/8 during this phase.
C. After reset, the Boot ROM code executes instructions for 1260 SYSCLKOUT cycles (SYSCLKOUT = XCLKIN/2) and
then samples BOOT Mode pins. Based on the status of the Boot Mode pin, the boot code branches to destination
memory or boot code function in ROM. The BOOT Mode pins should be held high/low for at least 2520 XCLKIN
cycles from boot ROM execution time for proper selection of Boot modes.
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.
D. The state of the GPIO pins is undefined (that is, they could be input or output) until the 1.8-V (or 1.9-V) supply
reaches at least 1 V and 3.3-V supply reaches 2.5 V.
Figure 6-11. Power-on Reset in Microcomputer Mode (XMP/MC = 0) (See Note D)
Copyright © 2001–2012, Texas Instruments Incorporated Electrical Specifications 105
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