SFFS569 December 2022 DP83TC814R-Q1 , DP83TC814S-Q1

4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of DP83TC814. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

Pin short-circuited to ground (seeTable 4-2 )
Pin open-circuited (see Table 4-3)
Pin short-circuited to an adjacent pin (see Table 4-4 )
Pin short-circuited to supply (see Table 4-5, Table 4-6, and Table 4-7 ).

Table 4-2 through Table 4-7 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Table 4-1 TI Classification of Failure Effects

Class	Failure Effects
A	Potential device damage that affects functionality.
B	No device damage, but loss of functionality.
C	No device damage, but performance degradation.
D	No device damage, no impact to functionality or performance.

For a detailed description of the device pins, see the Pin Configuration and Functions section in the DP83TC814 data sheet.

Figure 4-1 DP83TC814S-Q1 RHA Package 36-Pin VQFN

Figure 4-2 DP83TC814R-Q1 RHA Package 36-Pin VQFN

Table 4-2 Pin FMA for Device Pins Short-Circuited to Ground

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
MDC	1	No SMI communication available	B
INT	2	No valid interrupt status	B
RESET	3	Device in Reset state	B
XO	4	Crystal resonator clock will not start-up. Device PLL not operational. PHY state not known	B
XI	5	Crystal resonator clock will not start-up. Device PLL not operational. PHY state not known	B
LED_1	6	GPIO_1 not operational	B
VDDA	7	Device is disabled. Core supply short	B
DNC	8	No issue	D
NC	9	No issue	D
DNC	10	No issue	D
VDDA	11	Device is disabled. Core supply short	B
TRD_P	12	Link/data transfer cannot occur	A
TRD_M	13	Link/data transfer cannot occur	A
RX_ER	14	Valid data cannot be sent to MAC	B
RX_CTRL	15	Valid data cannot be sent to MAC	B
CLKOUT	16	GPIO_2 not operational. Daisy chaining won’t work if CLKOUT used to give clock to another PHY	B
GND_ESC	17	No issue	D
GND_ESC	18	No issue	D
DNC	19	No issue	D
DNC	20	No issue	D
NC	21	No issue	D
VDDMAC	22	MAC supply short	B
RX_D3	23	Valid data cannot be sent to MAC	B
RX_D2	24	Valid data cannot be sent to MAC	B
RX_D1	25	Valid data cannot be sent to MAC	B
RX_D0	26	Valid data cannot be sent to MAC	B
RX_CLK	27	Valid data cannot be sent to MAC	B
TX_CLK	28	Valid data cannot be received	B
TX_CTRL	29	Valid data cannot be received	B
TX_D3	30	Valid data cannot be received	B
TX_D2	31	Valid data cannot be received	B
TX_D1	32	Valid data cannot be received	B
TX_D0	33	Valid data cannot be received	B
VDDIO	34	IO supply short	B
LED_0	35	GPIO_0 not operational, link-up can still happen with register write for master	B
MDIO	36	No SMI communication available	B
DAP	GND	Appropriate connection	D

Table 4-3 Pin FMA for Device Pins Open-Circuited

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
MDC	1	No SMI communication available	B
INT	2	Interrupt will not be available	B
RESET	3	Normal Operation	D
XO	4	Crystal resonator clock will not start-up. Device PLL not operational. PHY state not known	B
XI	5	Crystal resonator clock will not start-up. Device PLL not operational. PHY state not known	B
LED_1	6	Normal Operation	D
VDDA	7	Device is disabled. Core supply open	B
DNC	8	No issue	D
NC	9	No issue	D
DNC	10	No issue	D
VDDA	11	Device is disabled. Core supply open	B
TRD_P	12	Link/data transfer cannot occur	B
TRD_M	13	Link/data transfer cannot occur	B
RX_ER	14	Valid data cannot be sent to MAC	B
RX_CTRL	15	Valid data cannot be sent to MAC	B
CLKOUT	16	No issue	D
GND_ESC	17	No issue	D
GND_ESC	18	No issue	D
DNC	19	No issue	D
DNC	20	No issue	D
NC	21	No issue	D
VDDMAC	22	Device is disabled. MAC supply open	B
RX_D3	23	Valid data cannot be sent to MAC	B
RX_D2	24	Valid data cannot be sent to MAC	B
RX_D1	25	Valid data cannot be sent to MAC	B
RX_D0	26	Valid data cannot be sent to MAC	B
RX_CLK	27	Valid data cannot be sent to MAC	B
TX_CLK	28	Valid data cannot be received	B
TX_CTRL	29	Valid data cannot be received	B
TX_D3	30	Valid data cannot be received	B
TX_D2	31	Valid data cannot be received	B
TX_D1	32	Valid data cannot be received	B
TX_D0	33	Valid data cannot be received	B
VDDIO	34	Device is disabled. IO supply open	B
LED_0	35	Link-up can still happen with register write for master	B
MDIO	36	No SMI communication available	B
DAP	GND	Ground open	B

Table 4-4 Pin FMA for Device Pins Short-Circuited to Adjacent Pin

Pin Name	Pin No.	Shorted to	Description of Potential Failure Effect(s)	Failure Effect Class
MDC	1	INT	No SMI communication available, No valid interrupt status	B
INT	2	RESET	When device intending to give interrupt it enters reset. Also, when host resets the PHY, host will get ISR triggered	B
RESET	3	XO	Device will keep getting reset	B
XO	4	XI	Device in unknown state	B
XI	5	LED_1	Device in unknown state	B
LED_1	6	VDDA	Device may get damaged.	A
VDDA	7	DNC	Device may get damaged	A
DNC	8	NC	No issue	D
NC	9	DNC	No issue	D
DNC	10	VDDA	Device may get damaged	A
VDDA	11	TRD_P	Link/data transfer cannot occur	A
TRD_P	12	TRD_M	Link/data transfer cannot occur	B
TRD_M	13	RX_ER	Link/data transfer cannot occur	B
RX_ER	14	RX_CTRL	Communication to MAC may be lost. Valid data will trigger an error	B
RX_CTRL	15	CLKOUT	Spurious data transfer. CLKOUT may have glitches	B
CLKOUT	16	GND_ESC	No issue	D
GND_ESC	17	GND_ESC	No issue	D
GND_ESC	18	DNC	No issue	D
DNC	19	DNC	No issue	D
DNC	20	NC	No issue	D
NC	21	VDDMAC	No issue	D
VDDMAC	22	RX_D3	Valid data cannot be sent to MAC	B
RX_D3	23	RX_D2	Valid data cannot be sent to MAC	B
RX_D2	24	RX_D1	MAC interface selection may be corrupt. Valid data cannot be sent to MAC	B
RX_D1	25	RX_D0	MAC interface selection may be corrupt. Valid data cannot be sent to MAC	B
RX_D0	26	RX_CLK	MAC interface selection may be corrupt. Valid data cannot be sent to MAC	B
RX_CLK	27	TX_CLK	Valid data cannot be exchanged with MAC	B
TX_CLK	28	TX_CTRL	Valid data cannot be received	B
TX_CTRL	29	TX_D3	Valid data cannot be received	B
TX_D3	30	TX_D2	Valid data cannot be received	B
TX_D2	31	TX_D1	Valid data cannot be received	B
TX_D1	32	TX_D0	Valid data cannot be received	B
TX_D0	33	VDDIO	Valid data cannot be received	B
VDDIO	34	LED_0	Valid data cannot be received. Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
LED_0	35	MDIO	Link-up still possible through register write. Spurious LED glow/blink	B
MDIO	36	MDC	No SMI communication available.	B

Table 4-5 Pin FMA for Device Pins Short-Circuited to VDDIO

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
MDC	1	No SMI communication available	B
INT	2	No interrupt status	B
RESET	3	Can never reset the device	B
XO	4	PHY state not known	B
XI	5	PHY state not known	B
LED_1	6	GPIO not operational, Device will enter standby mode. Need register write to start link-up	B
VDDA	7	Device may not power up	B
DNC	8	Device may get damaged	A
NC	9	No issue	D
DNC	10	Device may get damaged	A
VDDA	11	Device may not power up	B
TRD_P	12	Link/data transfer cannot occur. Device may get damaged	A
TRD_M	13	Link/data transfer cannot occur. Device may get damaged	A
RX_ER	14	PHY Address range restricted. MDC/MDIO communication could be lost. Device may get damaged when VDDIO and VDDMAC are different	B
RX_CTRL	15	PHY Address range restricted. MDC/MDIO communication could be lost. Device may get damaged when VDDIO and VDDMAC are different	B
CLKOUT	16	GPIO not operational. Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
GND_ESC	17	No issue	D
GND_ESC	18	No issue	D
DNC	19	Device may get damaged	A
DNC	20	Device may get damaged	A
NC	21	No issue	D
VDDMAC	22	No issue	D
RX_D3	23	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
RX_D2	24	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
RX_D1	25	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
RX_D0	26	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
RX_CLK	27	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
TX_CLK	28	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
TX_CTRL	29	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
TX_D3	30	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
TX_D2	31	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
TX_D1	32	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
TX_D0	33	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
VDDIO	34	Appropriate connection	D
LED_0	35	GPIO_0 not operational. Device will be always in master mode. May need register write for linkup	B
MDIO	36	No SMI communication available	B
DAP	GND	Device may get damaged	A

Table 4-6 Pin FMA for Device Pins Short-Circuited to VDDMAC

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
MDC	1	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
INT	2	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
RESET	3	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
XO	4	PHY state not known	B
XI	5	PHY state not known	B
LED_1	6	Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
VDDA	7	Device may not power up	B
DNC	8	Device may get damaged	A
NC	9	No issue	D
DNC	10	Device may get damaged	A
VDDA	11	Device may not power up	B
TRD_P	12	Link/data transfer cannot occur. Device may get damaged	A
TRD_M	13	Link/data transfer cannot occur. Device may get damaged	A
RX_ER	14	PHY Address range restricted. MDC/MDIO communication could be lost. Invalid data triggered to the MAC	B
RX_CTRL	15	PHY Address range restricted. MDC/MDIO communication could be lost. Invalid data triggered to the MAC	B
CLKOUT	16	GPIO not operational.	B
GND_ESC	17	No issue	D
GND_ESC	18	No issue	D
DNC	19	Device may get damaged	A
DNC	20	Device may get damaged	A
NC	21	No issue	D
VDDMAC	22	No issue	D
RX_D3	23	Valid data cannot be sent to MAC	B
RX_D2	24	Valid data cannot be sent to MAC	B
RX_D1	25	Valid data cannot be sent to MAC	B
RX_D0	26	Valid data cannot be sent to MAC	B
RX_CLK	27	Valid data cannot be sent to MAC	B
TX_CLK	28	Valid data cannot be received from MAC	B
TX_CTRL	29	Valid data cannot be received from MAC	B
TX_D3	30	Valid data cannot be received from MAC	B
TX_D2	31	Valid data cannot be received from MAC	B
TX_D1	32	Valid data cannot be received from MAC	B
TX_D0	33	Valid data cannot be received from MAC	B
VDDIO	34	Device will be functional	D
LED_0	35	GPIO_0 not operational. Device will be always in master mode. May need register write for linkup. Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
MDIO	36	No SMI communication available. Device may get damaged when VDDIO and VDDMAC are of different voltage levels	A
DAP	GND	Device may get damaged	A

Table 4-7 Pin FMA for Device Pins Short-Circuited to VDDA

Pin Name	Pin No.	Description of Potential Failure Effect(s)	Failure Effect Class
MDC	1	Device may get damaged	A
INT	2	Device may get damaged	A
RESET	3	Device may get damaged	A
XO	4	PHY state not known	B
XI	5	PHY state not known	B
LED_1	6	Device may get damaged	A
VDDA	7	Appropriate connection	D
DNC	8	Device may get damaged	A
NC	9	No issue	D
DNC	10	Device may get damaged	A
VDDA	11	Appropriate connection	D
TRD_P	12	Link/data transfer cannot occur. Device may get damaged	A
TRD_M	13	Link/data transfer cannot occur. Device may get damaged	A
RX_ER	14	Device may get damaged	A
RX_CTRL	15	Device may get damaged	A
CLKOUT	16	Device may get damaged	A
GND_ESC	17	No issue	D
GND_ESC	18	No issue	D
DNC	19	Device may get damaged	A
DNC	20	Device may get damaged	A
NC	21	No issue	D
VDDMAC	22	Device will be functional	D
RX_D3	23	Device may get damaged	A
RX_D2	24	Device may get damaged	A
RX_D1	25	Device may get damaged	A
RX_D0	26	Device may get damaged	A
RX_CLK	27	Device may get damaged	A
TX_CLK	28	Device may get damaged	A
TX_CTRL	29	Device may get damaged	A
TX_D3	30	Device may get damaged	A
TX_D2	31	Device may get damaged	A
TX_D1	32	Device may get damaged	A
TX_D0	33	Device may get damaged	A
VDDIO	34	Device will be functional	D
LED_0	35	Device may get damaged	A
MDIO	36	No SMI communication available. Device may get damaged	A
DAP	GND	Device may get damaged	A