Critical phy issue

Question

Dear, I am facing a very critical issue using the W7500P: I have several W7500P units and most of them work fine, but ~20% of the units cannot establish link. (Phy link status always return 0). I have created a very simple code that allows the issue to be reproduced (In units that are ok, it prints “1” and in the others, it prints “0”: #include "mbed.h" #include "W7500x_toe.h" #include "w7500x_gpio.h" #include "w7500x_wztoe.h" #define MDIO GPIO_Pin_15 #define MDC GPIO_Pin_14 #define GPIO_MDC GPIOB #define PHY_ADDR_IP101G 0x01 #define PHY_ADDR PHY_ADDR_IP101G #define SVAL 0x2 //right shift val = 2 #define PHYREG_CONTROL 0x0 //Control Register address (Contorl basic register) #define PHYREG_STATUS 0x1 //Status Register address (Status basic register) Serial pc(PC_10, PC_11); int main() { pc.printf("
PHY Debug
"); wait_ms(10);//for S/W reset wait_ms(10);//for MDC I/F RDY mdio_init(GPIO_MDC, MDC, MDIO); mdio_write(GPIO_MDC, PHYREG_CONTROL, 0x8000); while(1){ wait_ms(500);//for S/W reset pc.printf("%d
",(mdio_read(GPIO_MDC, PHYREG_STATUS)>>SVAL)&0x01); } } Can someone please assist me? Is it a MCU issue? Am I doing something wrong? Additional note: I have downloaded the IP101G datasheet and I developed this code based on it.

pherig · Answer

Adding more info: I have performed more tests using 5 different boards (3 have worked fine and 2 have presented the issue) and I notice that the label in the W7500P component is almost erased in the ones with the issue.

pherig · Answer

Dear, I am sorry for sending one more message, but we are facing this issue with several W7500P units. Can you please help me?

pherig · Answer

I noticed it is an intermittent problem in some W7500P units. Can you please detail what are the W7500 pins that are connected to the phy and how we should set their pad control registers?