Texas Instruments Delfino C28346 DIM168 ControlCARD TMDSCNCD28346-168 TMDSCNCD28346-168 데이터 시트
제품 코드
TMDSCNCD28346-168
t
w(RSL1)
t
h(boot-mode)
(B)
XCLKIN
X1/X2
XRS
Boot-Mode
Pins
V
(1.2 V/1.1 V)
DD
XCLKOUT
I/O Pins
User-Code Dependent
User-Code Dependent
Boot-ROM Execution Starts
Peripheral/GPIO Function
Based on Boot Code
Based on Boot Code
GPIO Pins as Input
OSCCLK/64
(A)
GPIO Pins as Input (State Depends on Internal PU/PD)
t
OSCST
User-Code Dependent
Address/Data/
Control
(Internal)
Address/Data Valid. Internal Boot-ROM Code Execution Phase
User-Code Execution Phase
t
d(EX)
OSCCLK/16
V
(3.3 V)
DDIO
V
(1.8 V)
DD18
t
pup
(C)
SPRS516D – MARCH 2009 – REVISED AUGUST 2012
A.
Upon power up, SYSCLKOUT is OSCCLK/8. Since the XTIMCLK, CLKMODE, and BY4CLKMODE bits in the
XINTFCNF2 register come up with a reset state of 1, SYSCLKOUT is further divided by 8 before it applies to
XCLKOUT. This explains why XCLKOUT = OSCCLK/64 during this phase. Subsequently, boot ROM changes
SYSCLKOUT to OSCLK/2. Because the XTIMCLK register is unchanged by the boot ROM, XCLKOUT is OSCCLK/16
during this phase.
XINTFCNF2 register come up with a reset state of 1, SYSCLKOUT is further divided by 8 before it applies to
XCLKOUT. This explains why XCLKOUT = OSCCLK/64 during this phase. Subsequently, boot ROM changes
SYSCLKOUT to OSCLK/2. Because the XTIMCLK register is unchanged by the boot ROM, XCLKOUT is OSCCLK/16
during this phase.
B.
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.
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.
C.
See
for requirements to ensure a high-impedance state for GPIO pins during power-up.
Figure 6-5. Power-on Reset
120
Electrical Specifications
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