Micrel, Inc.
KSZ9021RL/RN
Pin Description – KSZ9021RL
Pin Number
1
Pin Name
TXRXP_A
Type
(1)
I/O
Pin Function
Media Dependent Interface[0], positive signal of differential pair
1000Base-T Mode:
TXRXP_A corresponds to BI_DA+ for MDI configuration and BI_DB+ for
MDI-X configuration, respectively.
10Base-T / 100Base-TX Mode:
TXRXP_A is the positive transmit signal (TX+) for MDI configuration and
the positive receive signal (RX+) for MDI-X configuration, respectively.
2
TXRXM_A
I/O
Media Dependent Interface[0], negative signal of differential pair
1000Base-T Mode:
TXRXM_A corresponds to BI_DA- for MDI configuration and BI_DB- for
MDI-X configuration, respectively.
10Base-T / 100Base-TX Mode:
TXRXM_A is the negative transmit signal (TX-) for MDI configuration and
the negative receive signal (RX-) for MDI-X configuration, respectively.
3
4
5
6
7
AGNDH
AVDDL
AVDDL
AVDDH
TXRXP_B
Gnd
P
P
P
I/O
Analog ground
1.2V analog V
DD
1.2V analog V
DD
3.3V analog V
DD
Media Dependent Interface[1], positive signal of differential pair
1000Base-T Mode:
TXRXP_B corresponds to BI_DB+ for MDI configuration and BI_DA+ for
MDI-X configuration, respectively.
10Base-T / 100Base-TX Mode:
TXRXP_B is the positive receive signal (RX+) for MDI configuration and
the positive transmit signal (TX+) for MDI-X configuration, respectively.
8
TXRXM_B
I/O
Media Dependent Interface[1], negative signal of differential pair
1000Base-T Mode:
TXRXM_B corresponds to BI_DB- for MDI configuration and BI_DA- for
MDI-X configuration, respectively.
10Base-T / 100Base-TX Mode:
TXRXM_B is the negative receive signal (RX-) for MDI configuration and
the negative transmit signal (TX-) for MDI-X configuration, respectively.
9
10
AGNDH
TXRXP_C
Gnd
I/O
Analog ground
Media Dependent Interface[2], positive signal of differential pair
1000Base-T Mode:
TXRXP_C corresponds to BI_DC+ for MDI configuration and BI_DD+ for
MDI-X configuration, respectively.
10Base-T / 100Base-TX Mode:
TXRXP_C is not used.
11
TXRXM_C
I/O
Media Dependent Interface[2], negative signal of differential pair
1000Base-T Mode:
TXRXM_C corresponds to BI_DC- for MDI configuration and BI_DD- for
MDI-X configuration, respectively.
10Base-T / 100Base-TX Mode:
TXRXM_C is not used.
October 2009
9
M9999-101309-1.1
MICREL [ MICREL SEMICONDUCTOR ]
