4
Specifications
2.6. I/O Expander
Chip
TI PCA9539 I/O Expander
Function
A two wire I2C bus (designated 10G_LED_SDA and 10G_LED_SCL on COM Express
Type 7 module) is defined to serialize the outbound (module - to-carrier) MAC LED. The
PCA9539 is mapped to I2C address 1110 100x (x=R/W bit). The table below defines the
port pin mapping for the I/O expander.
Note:
In this case,The PCA9539 is located on the 10GbE SFP+ Card.
Table 1: I2C Data Mapping to Carrier Board Based PCA9539 I/O Expander
Port Pin Signal Name
Signal Function
P0_0
10G_KR_LED0_0#
PHY 0, LED 0 -STATUS/ACT
P0_1
10G_KR_LED0_1#
PHY 0, LED 1 -LINK SPEED MAX
P0_2
10G_KR_LED0_2#
PHY 0, LED 2 -LINK SPEED
P0_3
10G_KR_LED1_0#
PHY 1, LED 0 -STATUS/ACTIVITY
P0_4
10G_KR_LED1_1#
PHY 1, LED 1 -LINK SPEED MAX
P0_5
10G_KR_LED1_2#
PHY 1, LED 2 -LINK SPEED
P0_6
10G_KR_STRAP01 PHY 0-1, 0 = PHY to use I2C,
1 = PHY to use MDIO
P0_7
10G_KR_STRAP23 PHY 2-3, 0 = PHY to use I2C,
1 = PHY to use MDIO
P1_0
10G_KR_LED2_0#
PHY 2, LED 0 -STATUS/ACT
P1_1
10G_KR_LED2_1#
PHY 2, LED 1 -LINK SPEED MAX
P1_2
10G_KR_LED2_2#
PHY 2, LED 2 -LINK SPEED
P1_3
10G_KR_LED3_0#
PHY 3, LED 0 -STATUS/ACT
P1_4
10G_KR_LED3_1#
PHY 3, LED 1 -LINK SPEED MAX
P1_5
10G_KR_LED3_2#
PHY 3, LED 2 -LINK SPEED
P1_6
RSVD
TBD
P1_7
RSVD
TBD
Preliminary