User's Manual l MBa8Xx UM 0100 l © 2020, TQ-Systems GmbH
Page 25
Ethernet (continued)
The Transceiver DP83867 has boot straps to start with configurable default values. All boot straps can be customized by
placement options. Further information is available in the MBa8Xx schematics.
The standard configuration on the MBa8Xx is shown in the following table, alternatively, these can be adjusted via register
settings or via placement options.
Table 26:
Standard configuration of Ethernet transceivers (boot straps)
Config-Pin on Ethernet-Transceiver
(14)
Default MBa8Xx Mode
(15)
Description
RX_D0 (Transceiver #1)
1
Addresses for Management Interface (SMI):
Transceiver #1 -
0b0000
Transceiver #2 -
0b0011
RX_D0 (Transceiver #2)
4
RX_D2
1
RX_CTRL
3
Not applicable
GPIO_0
1
RGMII RX CLOCK SKEW = 2.0 ns
GPIO_1
1
LED_2
1
RGMII TX CLOCK SKEW = 2.0 ns
LED_1
1
Mode 10/100/1000 Mbit/s available (ANEG_SEL = 0)
LED_0
1
Port Mirroring disabled, SGMII Mode disabled
The activity status of the respective Ethernet port is indicated by the LEDs in the RJ45 sockets. The table shows the default
configuration. This can be adapted via register settings in the transceivers. The statuses are identical for both Ethernet ports.
Table 27:
Ethernet-LEDs
LED
Colour
Function / Indication
LED left
Green
Connection is established
LED right
Yellow
Send and receive activity
The possible data throughput is influenced by the system load and the software used. With the standard BSP, the following
transfer rates can be achieved on the MBa8Xx with a Gigabit link.
Table 28:
Characteristics Ethernet 1 / 2 (X18, X19)
Ethernet
Parameter
Min.
Typ.
Max.
(16)
Remark
Ethernet 1
Upstream
–
941 Mbit/s
1000 Mbit/s
Remote station Full-Duplex 1 Gbit over CAT 5e
Downstream
–
895 Mbit/s
1000 Mbit/s
Ethernet 2
Upstream
–
941 Mbit/s
1000 Mbit/s
Remote station Full-Duplex 1 Gbit over CAT 5e
Downstream
–
933 Mbit/s
1000 Mbit/s
14:
Identical for both transceivers unless explicitly stated.
15:
A detailed description of the modes and their configuration can be found in data sheet (6).
16:
Theoretical maximal value.
