max2986cxv Maxim Integrated Products, Inc., max2986cxv Datasheet - Page 22

• Manufacturer Part Number: max2986cxv
• Description: Integrated Powerline Digital Transceiver Integrated Products
• Manufacturer: Maxim Integrated Products, Inc.

according to Table 18. Pullup/pulldown resistors for LEDs
are 1kΩ or less.
The states of GPIO pins and initialization pins during
the boot process are shown in Table 17. See the Pin
Description for more information.
The MAX2986 has a built-in oscillator that requires an
external crystal. Use a 30MHz crystal with stability of
±25ppm max over operating temperature. All other nec-
essary clocks are generated internally by means of two
integrated PLLs. Figure 24 illustrates how to connect a
Integrated Powerline Digital Transceiver
Table 17. Boot Modes
X = Don’t care.
* PU: If pin GPIO[10] is pulled down instead of pulled up, it indicates that there is no flash device connected to the chip. If this is the
case and if LED0_BP0 = LED1_BP1 = 0, then the GPIO[8] line must be pulled up.
Table 18. Boot Error Codes
22
BOOT MODE
Encrypted
image
downloaded
from flash
Code
downloaded
through UART
LED2_BP2
______________________________________________________________________________________
0
0
0
1
1
1
1
0
LED1_BP1
Flash type is SPI
Flash type is SPI
Flash type is I
FLASH TYPE
(SST25VF)
(AT45DB)
0
1
1
0
0
1
1
0
X
2
C
LED0_BP0
Clocks and Reset
1
0
1
0
1
0
1
0
GPIO[23]
0
1
X
0
The flash does not contain a valid image.
The size of the image is more than 128kB.
The base address of the image is out of the allowed range.
Checksum error.
No flash is available.
Invalid boot mode.
No error.
GPIO[22]
1
1
1
0
crystal to the MAX2986. If the external clock oscillator is
used, leave XOUT unconnected as shown in Figure 25.
Since the reset signal RESET is used in PLL modules, it
must be activated after the PLL clock generation delay,
which is about 0.5ms.
The MAX2986 firmware makes special use of GPIO
pins as described in Table 19. GPIO pins are utilized in
input, output, or both directions.
BOOT/FT PINS
GPIO[21]
BOOT STATUS
0
0
0
0
GPIO[8]
PU
PU
PD
X
GPIO Pin Usage
GPIO[10]
PU*
PU
PU
PU